Free Online Calculators
The complete index of all 150 free calculators on ThisCalc, organized into 26 categories. Every tool runs entirely in your browser - instant results, no signup, and your data never leaves your device.
Mortgage Calculator
Calculate monthly payments, total interest, and amortization schedule for your home loan.
Finance
BMI Calculator
Calculate your Body Mass Index and see which category you fall into.
Health
Compound Interest
See how your savings grow over time with compound interest and regular contributions.
Finance
Salary Calculator
Convert between hourly, daily, weekly, biweekly, monthly, and annual salary.
Finance
Loan Calculator
Estimate monthly payments and total cost for personal loans, auto loans, and more.
Finance
Calorie Calculator
Estimate daily calorie needs based on age, weight, height, and activity level.
Health
Percentage Calculator
Calculate percentages, percentage change, what percent one number is of another.
Math
Age Calculator
Calculate your exact age in years, months, days, hours, and minutes.
Date & Time
Scientific Calculator
Full scientific calculator with trig, logarithms, exponents, and memory functions.
Math
Tip Calculator
Calculate tip amount and split the bill between multiple people.
Finance
GPA Calculator
Calculate your semester and cumulative GPA on a 4.0 scale.
Business
Unit Converter
Convert between units of length, weight, temperature, volume, area, and more.
Math
Currency Converter
Convert between 30+ world currencies with live daily exchange rates. Free, instant results.
Finance
Fuel Cost Calculator
Estimate fuel costs for any trip based on distance, MPG, and gas price.
Finance
Retirement Calculator
Plan your retirement savings with 401(k) match, compound growth, and the 4% rule.
Finance
GPA Calculator
Calculate your semester and cumulative GPA on a 4.0 scale. Add courses, grades, and credit hours. Free, instant results for students.
Academic Calculators
Percentage Calculator
Calculate percentages instantly: what is X% of Y, percent change, increase, decrease, tips, discounts, and grades. Free, no signup required.
Academic Calculators
Fraction Calculator
Calculate fractions with step-by-step solutions. Add, subtract, multiply, and divide fractions. Simplify fractions and convert to decimals.
Academic Calculators
Scientific Calculator
Perform complex calculations with ThisCalc's scientific calculator. Handle trigonometry, logarithms, exponents, factorials, and constants. A
Academic Calculators
Probability Calculator
Calculate probabilities for single events, multiple trials, combinations, permutations, and two independent events. Instant results for stat
Academic Calculators
Auto Loan Calculator
Calculate your monthly car payment, total interest, and true cost of ownership with our auto loan calculator. Compare loan terms and rates.
Automotive Calculators
Car Lease vs Buy Calculator
Use our car lease vs. buy calculator to compare total costs over your ownership period. Analyze monthly payments, equity, and overall expens
Automotive Calculators
Gas Mileage Calculator
Calculate your car's gas mileage in MPG, L/100km, and km/L. Compare to the US average and see your cost per mile.
Automotive Calculators
Fuel Cost / Trip Calculator
Calculate your trip's fuel cost, gallons needed, cost per mile, and CO2 emissions. Compare different vehicle types and fuel prices.
Automotive Calculators
Profit Margin
Calculate gross margin, net margin, and markup from cost and revenue.
Business
Utilization Rate
Calculate billable utilization rate, revenue efficiency, and profit margin for consulting teams.
Business
Break-Even Analysis
Find your break-even point in units and revenue with contribution margin analysis.
Business
Invoice Calculator
Calculate invoice totals with line items, tax, and discounts for freelancers.
Business
Meeting Cost
Calculate the real dollar cost of meetings based on attendee salaries and duration.
Business
Hours Calculator
Calculate hours worked, overtime, and pay from clock in/out times.
Business
Time Card Calculator
Weekly time card: daily clock in/out and breaks, with overtime and gross pay.
Business
Percent Change Calculator
Percent increase or decrease between two numbers, plus percent difference.
Math
Sales Tax Calculator
Add sales tax to a price, or back the tax out of a tax-included total.
Finance
401(k) Calculator
Project your 401(k) with employer match, plus the 2026 IRS contribution limits.
Finance
RMD Calculator
Your required minimum distribution from the IRS Uniform Lifetime Table.
Finance
RAID Rebuild Risk
Visualize URE probability and data loss risk during RAID array rebuild.
Business
SaaS Metrics Lab
Calculate LTV:CAC ratio, payback period, NRR, and model cohort revenue for SaaS businesses.
Business
Concrete Calculator
Calculate concrete volume, bag count, and cost for slabs, footings, and columns with our free online calculator.
Construction Calculators
Rainwater Harvesting Storage Sizing Calculator
Calculate the ideal storage size for your rainwater harvesting system. Our calculator considers roof area, rainfall, and usage to ensure a r
Construction Calculators
Flooring Calculator
Calculate square footage, material needed, and total cost for hardwood, laminate, tile, or carpet flooring. Includes waste factor.
Construction Calculators
Potting Soil Calculator
Calculate potting soil needs for various shapes. Get accurate results for round, rectangular, tapered, and hemisphere pots.
Construction Calculators
Recipe Scaler Calculator
Free recipe scaler. Enter original servings, target servings, and your ingredient list. Handles fractions, mixed numbers, and common kitchen
Cooking Calculators
Sourdough Calculator
Plan sourdough with a beginner-friendly quick start or advanced baker controls. Get formula math, levain planning, bake timeline, method ste
Cooking Calculators
Coffee Extraction Yield Calculator
Calculate your coffee extraction yield from TDS readings and check it against the SCA Golden Cup standard. Accurate brewing ratio calculator
Cooking Calculators
Currency Converter
Convert between 30+ world currencies with live exchange rates updated daily. Supports USD, EUR, GBP, JPY, CAD, AUD, and more. Instant result
Currency Calculators
Salary Calculator
Convert between hourly, daily, weekly, biweekly, monthly, and annual salary and estimate take-home pay after federal, FICA, state taxes, 401
Currency Calculators
Tip Calculator
Calculate tip amount, total bill, and split between multiple people. Supports custom tip percentages. Free, instant, no signup.
Currency Calculators
Compound Interest Calculator
Calculate compound interest on savings and investments to see how your money grows over time with regular contributions and different compou
Currency Calculators
Age Calculator
Calculate your exact age in years, months, days, hours, and minutes.
Date & Time
Date Difference
Find the number of days, weeks, or months between two dates.
Date & Time
Time Zone Converter
Convert times between any two time zones instantly. See UTC offsets, DST status, and time differences.
Date & Time
Countdown Calculator
Live ticking countdown to any date or event with years, months, days, hours, minutes, and seconds.
Date & Time
Time Calculator
Add or subtract hours, minutes, and seconds. Calculate the difference between two times with cross-midnight support.
Date & Time
Grade Calculator
Calculate your weighted grade average and find the minimum score needed on a final exam.
Education
GPA Calculator
Calculate semester and cumulative GPA from letter grades and credit hours.
Education
Weighted Average
Calculate weighted averages with percentage or points mode. See individual contributions and total weight.
Education
GPA & Letter Grade Converter
Convert between GPA, letter grade, and percentage. See Latin honors status and full grade scale.
Education
Final Grade Calculator
Find the score needed on a final exam or assignment to reach your target grade.
Education
Ohm's Law Calculator
Calculate voltage, current, resistance, and power instantly. Enter any 2 values to get the other 2.
Electrical
LED Resistor Calculator
Calculate the correct resistor for any LED circuit with E24 standard value and color code.
Electrical
Wire Gauge Calculator
Find the correct AWG wire gauge with voltage drop, power loss, and NEC ampacity ratings.
Electrical
Battery Life Calculator
Calculate battery runtime from capacity and current draw. Supports duty cycle and battery comparisons.
Electrical
Mortgage Calculator
Calculate monthly payments, total interest, and amortization schedule for your home loan.
Finance
Loan Calculator
Estimate monthly payments and total cost for personal loans, auto loans, and more.
Finance
Amortization Calculator
Build a full loan amortization schedule with monthly principal, interest, balance, and extra-payment payoff.
Finance
Compound Interest
See how your savings grow over time with compound interest and regular contributions.
Finance
Savings Calculator
Calculate how long to reach your savings goal or how much to save monthly.
Finance
Inflation Calculator
See how inflation affects purchasing power over time.
Finance
Salary Calculator
Convert between hourly, daily, weekly, biweekly, monthly, and annual salary.
Finance
Paycheck Calculator
Calculate take-home pay after taxes, FICA, and deductions.
Finance
Tip Calculator
Calculate tip amount and split the bill between multiple people.
Finance
Investment Return
Calculate ROI, annualized returns, and compare investment performance.
Finance
Tax Estimator
Estimate your federal income tax, effective rate, and see a bracket-by-bracket breakdown.
Finance
Retirement Calculator
Plan your retirement savings with 401(k) match, compound growth, and the 4% rule.
Finance
Debt Payoff
Compare snowball vs avalanche payoff strategies and find your debt-free date.
Finance
Rent vs Buy
Should you rent or buy? Compare total costs including equity, appreciation, and opportunity cost.
Finance
Car Lease vs Buy
Compare the total cost of leasing versus buying a car over your ownership period.
Finance
Auto Loan Calculator
Calculate monthly car payments, total interest, and true cost.
Finance
Refinance Calculator
Find your break-even point and total savings from refinancing your mortgage.
Finance
Net Worth
Track your personal balance sheet - assets minus liabilities with age benchmarks.
Finance
Seller Net Sheet
Estimate net proceeds from selling your home after commissions, closing costs, and payoff.
Finance
Moving Budget
Estimate total moving costs including movers, truck rental, packing, and hidden expenses.
Finance
Down Payment Calculator
Calculate your home down payment, loan size, PMI estimate, closing costs, and months to save.
Finance
CD Calculator
Calculate your CD maturity value, total interest earned, APR vs APY, and early withdrawal penalty.
Finance
APR Calculator
Calculate the true APR on any loan including fees, points, and closing costs to see real borrowing cost.
Finance
Debt-to-Income Ratio
Calculate your front-end and back-end DTI plus FHA, conventional, VA, and USDA mortgage qualification.
Finance
Fuel Cost Calculator
Calculate trip fuel cost, gallons needed, cost per mile, and CO2 emissions for any vehicle.
Finance
Single Debt Payoff
Calculate how long to pay off a single debt and how extra payments save you money.
Finance
FIRE Calculator
Calculate your FIRE number, years to financial independence, savings rate, and Coast FIRE number.
Finance
Gas Mileage Calculator
Calculate your car's MPG, L/100km, and cost per mile. Compare to the US average.
Finance
Mortgage Refinance
Compare current mortgage to a refinanced loan. See monthly savings, break-even, and net benefit.
Finance
One Rep Max (1RM)
Calculate your one rep max using 4 proven formulas with training percentage table and RPE reference.
Fitness & Sports
Pace Calculator
Calculate running pace, finish time, or distance with per-mile splits and race predictions.
Fitness & Sports
VO2 Max Calculator
Estimate your VO2 Max from Cooper run, Rockport walk, or step test with ACSM fitness classification.
Fitness & Sports
Heart Rate Zones
Calculate your 5 heart rate training zones using standard, Tanaka, or Karvonen formulas.
Fitness & Sports
Sous Vide Pasteurization
Calculate exact pasteurization time for sous vide cooking at any temperature.
Food Science
Spherification Ratios
Calculate sodium alginate and calcium lactate ratios for molecular gastronomy.
Food Science
Coffee Extraction Yield
Hit the SCAA Golden Cup standard by calculating extraction yield from TDS readings.
Food Science
Maillard Reaction Energy
Extract Maillard browning activation energy from two-temperature reaction rate data.
Food Science
Time of Death (Henssge)
Estimate post-mortem interval using Henssge's double-exponential body cooling model.
Forensics & History
Vitreous Potassium PMI
Estimate time of death from temperature-independent potassium leakage in the eye.
Forensics & History
Blood Alcohol (Watson)
Calculate BAC accurately using Watson's Total Body Water adaptation of Widmark.
Forensics & History
Bone Stature Estimation
Estimate living height from skeletal long bone measurements using Trotter-Gleser.
Forensics & History
Molar Wear Age
Determine age at death from molar wear gradients using Miles' method.
Forensics & History
Artifact Similarity
Calculate cultural similarity between archaeological sites from artifact frequencies.
Forensics & History
Obsidian Hydration Dating
Date obsidian artifacts by measuring atmospheric water absorption rim thickness.
Forensics & History
Ancient Currency Converter
Convert ancient Greek and Roman currency to raw silver bullion weight.
Forensics & History
Assize of Bread
Simulate the medieval English law that scaled bread weight inversely with grain prices.
Forensics & History
Amino Acid Dating
Date fossils beyond carbon-14 limits by measuring amino acid racemization.
Forensics & History
Mayan Calendar Converter
Convert Mayan Long Count dates to Gregorian dates using the GMT correlation.
Forensics & History
D&D Advantage Probability
Calculate exact hit probability with Advantage, Disadvantage, and modifiers in D&D 5e.
Gaming & Strategy
Hex Grid Distance
Measure distance on hexagonal grids using 3D cube coordinate conversion.
Gaming & Strategy
Elo Rating Probability
Calculate win probability from Elo rating differentials for chess and esports.
Gaming & Strategy
Lindy Effect Lifespan
Predict how long technologies and ideas will survive based on current age.
Gaming & Strategy
Network Value (Metcalfe)
Compare N-squared vs exponential value scaling for communication vs social networks.
Gaming & Strategy
Zipf's Law City Size
Predict any city's population from its rank using Zipf's power law distribution.
Gaming & Strategy
Dunbar's Number
Calculate the cognitive limit of stable social relationships from neocortex ratio.
Gaming & Strategy
Kelly Criterion
Find the mathematically optimal bet size to maximize long-term portfolio growth.
Gaming & Strategy
Macro Calculator
Calculate TDEE and daily protein, carb, and fat targets using Mifflin-St Jeor. Choose your goal and macro split.
Health
BMI Calculator
Calculate your Body Mass Index and see which category you fall into.
Health
Calorie Calculator
Estimate daily calorie needs based on age, weight, height, and activity level.
Health
Ideal Weight Calculator
Find your ideal weight using 5 medical formulas.
Health
Body Fat Calculator
Estimate body fat % using the US Navy and BMI methods.
Health
Pregnancy Due Date Calculator
Calculate your due date from LMP, IVF transfer, or conception. See gestational age, trimester, and key milestones.
Health
Sleep Cycle Calculator
Find the best time to go to bed or wake up based on 90-minute sleep cycles. Minimize morning grogginess.
Health
Dog Food Calculator
Plan your dog's daily calories, portion sizes, and treat budget based on weight goals.
Health
Water Intake Calculator
Calculate your daily water intake based on weight, exercise, climate, altitude, and pregnancy status.
Health
Paint Calculator
Calculate how much paint you need for any room, accounting for doors, windows, and coats.
Home & DIY
Flooring Calculator
Calculate square footage, material, and cost for hardwood, laminate, tile, or carpet.
Home & DIY
Concrete Calculator
Calculate cubic yards, bags, and cost for slabs, footings, and columns.
Home & DIY
HVAC BTU Calculator
Calculate the BTU capacity needed for heating or cooling any room.
Home & DIY
Deck Board Calculator
Calculate boards, screws, joists, and cost for your deck project.
Home & DIY
Energy Cost
Calculate how much any appliance costs to run per day, month, and year.
Home & DIY
Garden Planner
Calculate soil, mulch, and plant spacing for raised beds and garden plots.
Home & DIY
Potting Soil Calculator
Calculate how much potting soil you need for round, rectangular, tapered, and hemisphere pots. Includes bag count.
Home & DIY
Sourdough Calculator
Plan your sourdough bake with fermentation timing, levain builds, and a reverse-scheduling timeline.
Home & DIY
EV Charging Planner
Plan EV road trips with charging curve optimization, stop timing, and temperature-adjusted range.
Home & DIY
Home Battery Runtime
Calculate backup power duration with solar refill cycles during outages.
Home & DIY
Heat Pump Payback
Compare heat pump vs gas costs by climate zone with COP curves and IRA rebates.
Home & DIY
Pool Chemistry
Balance pool water chemistry with Langelier Saturation Index and chemical dosing.
Home & DIY
Homebrew Calculator
Calculate yeast pitch rates, priming sugar, and fermentation pressure for homebrewing.
Home & DIY
Welding Calculator
Calculate carbon equivalent, preheat temperature, and heat input for structural welding.
Home & DIY
3D Printing Calculator
Estimate filament usage, material cost, print time, and electricity for your 3D prints.
Home & DIY
Ham Radio Link Budget
Calculate signal propagation, link margin, and line-of-sight distance for amateur radio.
Home & DIY
Rainwater Harvesting
Size your rainwater tank based on roof area, rainfall patterns, and daily usage needs.
Home & DIY
Solar Panel Savings
Calculate solar panel savings, payback period, ROI, federal tax credit, and CO2 offset.
Home & DIY
Wallpaper Calculator
Calculate exactly how many wallpaper rolls you need, accounting for doors, windows, and pattern repeat.
Home & DIY
Fence Calculator
Calculate fence posts, rails, pickets, concrete bags, and total cost for a complete materials estimate.
Home & DIY
Gravel & Mulch Calculator
Calculate cubic yards, tons, bags, and cost for gravel, mulch, topsoil, sand, and more.
Home & DIY
Tile Calculator
Calculate tiles needed, boxes, grout, thinset mortar, and total cost with waste factor support.
Home & DIY
Percentage Calculator
Calculate percentages, percentage change, what percent one number is of another.
Math
Average Calculator
Calculate mean, median, mode, geometric mean, harmonic mean, and weighted average for any list of numbers.
Math
Fraction Calculator
Add, subtract, multiply, and divide fractions with step-by-step solutions.
Math
Standard Deviation Calculator
Calculate population and sample standard deviation, variance, mean, median, mode, and more.
Math
Random Number Generator
Generate random integers or decimals, single or multiple values, with optional duplicate prevention and sorting.
Math
Unit Converter
Convert between units of length, weight, temperature, volume, area, and more.
Math
Scientific Calculator
Full scientific calculator with trig, logarithms, exponents, and memory functions.
Math
Square Root Calculator
Square roots, cube roots, Nth roots, radical simplification, perfect square check, and prime factorization.
Math
Exponent Calculator
Raise any base to any power, view common powers, and calculate logarithms.
Math
Ratio Calculator
Simplify ratios, solve proportions, scale values, and calculate aspect ratios.
Math
Probability Calculator
Calculate event probability, combinations, permutations, and conditional probability.
Math
BMI Calculator
Calculate your Body Mass Index (BMI) using imperial or metric units. Understand your weight category and its implications for health screeni
Medical Calculators
Body Fat Calculator
Calculate your body fat percentage using the US Navy and BMI methods. Input your measurements to get an estimate of your body composition an
Medical Calculators
Calorie Calculator
Estimate your daily calorie needs based on age, weight, height, and activity level. Calculate BMR and TDEE for weight loss, maintenance, or
Medical Calculators
Ideal Weight Calculator
Calculate ideal body weight using 5 clinical formulas (Devine, Robinson, Miller, Hamwi, BMI 22). Educational reference for medical context —
Medical Calculators
Pregnancy Due Date Calculator
Calculate your pregnancy due date using LMP, IVF transfer date, or conception date. Get gestational age, trimester, days remaining, and key
Medical Calculators
Mortgage Calculator
Calculate your monthly mortgage payment, total interest, and view a full amortization schedule. Instant results, no signup required.
Real Estate Calculators
Rent vs Buy Calculator
Compare the true cost of renting versus buying a home to make the right financial decision. This calculator considers all costs, including h
Real Estate Calculators
Refinance Break-Even Calculator
Calculate your refinance break-even point and monthly savings. Compare your current mortgage to a new loan to see if refinancing is financia
Real Estate Calculators
Seller Net Sheet Calculator
Estimate your net proceeds from selling your home after commissions, closing costs, mortgage payoff, and taxes. Free seller closing cost cal
Real Estate Calculators
Down Payment Calculator
Calculate your home down payment amount, loan size, PMI estimate, closing costs, and months to save. Free, instant, no signup required.
Real Estate Calculators
Flooring Calculator
Calculate square footage, material needed, and total cost for hardwood, laminate, tile, or carpet flooring. Includes waste factor.
Real Estate Calculators
Amino Acid Racemization Calculator
Estimate the age of biological materials using amino acid racemization. Free online calculator for geochronological dating.
Science Experiments
Asteroid Crater Diameter Calculator
Calculate the transient and final crater diameter from an asteroid impact using the Pi-scaling law. Determine crater size from impactor size
Science Experiments
Alcubierre Warp Drive Calculator
Calculate the negative energy density required for an Alcubierre warp bubble. Explore the theoretical physics and current limitations.
Science Experiments
Asteroid Impact Effects Calculator
Estimate the effects of an asteroid impact, including seismic shaking, airblast, and thermal radiation, at your specified distance. Use simp
Science Experiments
Astrophotography Exposure & Field-of-View Planner
Optimize your astrophotography by calculating precise exposure limits, field of view, and total integration time for your specific equipment
Science Experiments
Hohmann Transfer Orbit Calculator
Calculate the delta-v for the most fuel-efficient transfer between two circular orbits using ThisCalc's Hohmann Transfer Orbit Calculator.
Science Experiments
Hohmann Transfer Orbit
Calculate the delta-v for fuel-efficient two-burn orbital transfers between circular orbits.
Space & Physics
Bi-Elliptic Transfer
Compare 3-burn bi-elliptic vs Hohmann transfers for extreme orbit changes.
Space & Physics
Relativistic Journey
Calculate crew time vs Earth time for constant-acceleration relativistic space travel.
Space & Physics
Relativistic Fuel Ratio
Calculate the exponential antimatter fuel requirements for near-light-speed travel.
Space & Physics
Relativistic Doppler Shift
Visualize blueshift and redshift of light from relativistic-speed sources.
Space & Physics
O'Neill Cylinder Gravity
Find the spin rate needed to simulate Earth gravity inside a cylindrical space habitat.
Space & Physics
Coriolis Deflection
Calculate the head-to-foot gravity gradient inside a rotating space station.
Space & Physics
Kugelblitz Black Hole
Calculate mass and Hawking radiation power output of a photon-created black hole.
Space & Physics
Roche Limit
Find where tidal forces rip a moon apart - rigid body vs fluid body limits.
Space & Physics
Asteroid Crater Size
Compute transient crater diameter from asteroid impacts using Pi-scaling law.
Space & Physics
Radiation Shielding
Calculate material thickness to shield astronauts using Beer-Lambert attenuation.
Space & Physics
Alcubierre Warp Drive
Calculate the exotic negative energy density required for a theoretical warp bubble.
Space & Physics
Astrophotography Planner
Calculate max exposure time, field of view, and pixel scale for deep sky imaging.
Space & Physics
Asteroid Impact Effects
Simulate blast, thermal, seismic, and tsunami effects of an asteroid impact at your distance.
Space & Physics
Ice Load Bearing
Calculate maximum safe vehicle weight on frozen lakes using Gold's Formula.
Survival
WBGT Heat Stress
Calculate true military-grade heat stress index accounting for sun and wind.
Survival
Loaded March Calories
Predict metabolic energy cost of hiking with a heavy pack using the Pandolf equation.
Survival
Dead Reckoning
Determine ocean current set and drift by comparing DR position to actual GPS fix.
Survival
Signal Fire Visibility
Calculate how far a rescue aircraft can spot your signal fire smoke.
Survival
Wildfire Defense
Assess ember exposure risk and defensible space zones for your property.
Survival
Scuba Gas Planner
Plan dive gas, rock bottom, turn pressure, and Nitrox MOD for safe diving.
Survival
Aircraft Weight & Balance
Plot CG on the weight/balance envelope for Cessna, Piper, and custom aircraft.
Survival
Nuclear Blast Effects
Estimate fireball, blast wave, thermal radiation, and fallout effects at any distance from a nuclear detonation.
Survival
Federal Tax Estimator
Estimate your 2026 federal income tax with updated brackets. Free tax estimator shows taxable income, effective rate, marginal rate, and bra
Tax Calculators
Take-Home Pay Calculator
Calculate your net paycheck after federal tax, state tax, Social Security, and Medicare. Estimate your take-home pay with ThisCalc's free on
Tax Calculators
Salary Calculator
Convert between hourly, daily, weekly, biweekly, monthly, and annual salary and estimate take-home pay after federal, FICA, state taxes, 401
Tax Calculators
Tip Calculator
Calculate tip amount, total bill, and split between multiple people. Supports custom tip percentages. Free, instant, no signup.
Tax Calculators
Debt to Income Ratio Calculator
Calculate your debt-to-income ratio (DTI) instantly. See front-end and back-end DTI, plus FHA, conventional, VA, and USDA mortgage qualifica
Tax Calculators
Moving Budget Calculator
Estimate your total moving cost with ThisCalc's calculator. Factor in professional movers, truck rental, packing, storage, and hidden fees t
Tax Calculators
Hours Calculator
Calculate total hours worked, including breaks and overtime. Free online hours calculator.
Time Tracking Calculators
Age Calculator
Calculate your exact age in years, months, days, hours, and minutes. Account for leap years and find days until next birthday.
Time Tracking Calculators
Date Difference Calculator
Calculate the number of days, weeks, months, and years between two dates. Instant results.
Time Tracking Calculators
Countdown Calculator
Track the exact time remaining until any future event with our live countdown calculator. See years, months, days, hours, minutes, and secon
Time Tracking Calculators
Pregnancy Due Date Calculator
Calculate your pregnancy due date using LMP, IVF transfer date, or conception date. Get gestational age, trimester, days remaining, and key
Time Tracking Calculators
Electricity Bill Estimator
Estimate your electricity bill from kWh usage and your rate. See daily, monthly, and annual costs, plus a usage benchmark based on...
Calculator
Graphing Calculator
Plot y = f(x), parametric curves, and polar functions in your browser. Pan, zoom, graph multiple expressions at once, and save your...
Calculator
Pet Age Calculator
Convert your dog or cat's age to human years using modern veterinary formulas. See life stage, life expectancy, and lifespan percentage.
Calculator
Programmer Calculator
Convert between hex, decimal, binary, and octal and apply bitwise AND, OR, XOR, NOT, and shifts at 8/16/32/64-bit width. Free,...
Calculator
ThisCalc is a free, ad-supported collection of 150 calculators spanning personal finance, mathematics, health and fitness, science and physics, home improvement, cooking, and more. This page is the master index - use the category jump links above to find a tool fast, or browse each category section below. Every calculator is built to give an instant, accurate answer with a clear explanation of the formula it uses and the assumptions behind it.
Looking for something specific? Popular starting points include the mortgage calculator, compound interest calculator, BMI calculator, percentage calculator, and loan calculator. You can also explore by topic on the finance, health, math, and home & DIY category pages.