All Calculators
Browse free online calculators for taxes, income, mortgages, cars, energy, health, math and everyday conversions for practical daily decisions.
US Tax Calculators
Federal Income Tax Calculator 2026
Federal income tax calculator for 2026: estimate your IRS tax, effective rate and marginal bracket using the new standard deduction.
Sales Tax Calculator
Sales tax calculator: add state and local sales tax to a price, or back the tax out of a receipt total.
Where Do My Tax Dollars Go Calculator
Where do my tax dollars go: split the federal tax you paid across Social Security, Medicare, defense, interest and more.
Capital Gains Tax Calculator
Capital gains tax calculator for 2026: estimate federal tax on a stock, home or asset sale, short or long term.
Self-Employment Tax Calculator
Self employment tax calculator: estimate 2026 Social Security and Medicare tax on freelance or 1099 income, plus the deduction.
Paycheck and Salary Calculators
Paycheck Calculator
Paycheck calculator: estimate take-home pay after federal income tax, Social Security, Medicare, 401(k) and state tax.
Hourly to Salary Calculator
Hourly to salary calculator: convert an hourly wage to annual, monthly, biweekly and weekly pay before taxes.
Overtime Pay Calculator
Overtime pay calculator: weekly gross pay with time-and-a-half or double time for hours over 40 under the FLSA.
Hourly Paycheck Calculator
Hourly paycheck calculator: estimate take-home pay from an hourly wage after federal tax, Social Security, Medicare and state tax.
Illinois Paycheck Calculator
Illinois paycheck calculator: estimate take-home pay after federal tax, FICA and Illinois's 4.95% flat state income tax.
Pay Raise Calculator
Pay raise calculator: enter your salary and raise percent to see the new salary, the increase and hourly pay before taxes.
Time and a Half Calculator
Time and a half calculator: work out overtime pay at 1.5x or 2x your hourly rate and your total gross pay for the week, step by step.
Mortgage and Home Calculators
Mortgage Calculator with PITI
Mortgage calculator with taxes and insurance: monthly PITI payment including property tax, homeowners insurance, PMI and HOA.
How Much House Can I Afford Calculator
How much house can I afford: maximum home price from your income, debts and down payment using the 28/36 lender rule.
Property Tax Calculator
Property tax calculator: annual and monthly property tax from home value, assessment ratio, exemptions and local rate.
Rent vs Buy Calculator
Rent vs buy calculator: compare the true cost of buying a home with renting over the years you plan to stay.
Cubic Yard Calculator
Cubic yard calculator: convert length, width and depth into cubic yards of soil, gravel, mulch or concrete, with a waste allowance.
Board Foot Calculator
Board foot calculator: work out lumber volume from thickness, width and length, and total cost at your price per board foot.
Cap Rate Calculator
Cap rate calculator: divide net operating income by property price to compare rental properties on yield, with NOI shown.
Down Payment Calculator
Down payment calculator: see the cash needed up front, the loan amount and the monthly principal and interest payment on your mortgage.
HELOC Calculator
HELOC calculator: see how much home equity you can borrow and the interest-only and repayment-period payments.
VA Loan Calculator
VA loan calculator: estimate your monthly payment with the VA funding fee, down payment and rate for a US home purchase.
Gravel Calculator
Gravel calculator: find the cubic yards and tons of gravel, crushed stone or sand a driveway or path needs.
Mulch Calculator
Mulch calculator: find cubic yards and 2 cubic foot bags of mulch for a garden bed from its size and depth.
Refinance Calculator
Refinance calculator: compare your current mortgage to a new rate and term, see monthly savings and the break-even month.
Gas, Fuel and Car Calculators
Gas Cost Calculator
Gas cost calculator: estimate the fuel cost of any US road trip from miles, your car's MPG and the price per gallon.
Fuel Savings Calculator
Fuel savings calculator: how much you save on gas per year by switching to a car with better MPG.
EV vs Gas Cost Calculator
EV vs gas cost calculator: compare yearly fuel costs of an electric car and a gas car using your electricity rate and gas price.
Auto Loan Calculator
Auto loan calculator: monthly car payment with sales tax, fees, trade-in and down payment, plus total interest.
Tire Size Calculator
Tire size calculator: compare two tire sizes for diameter, sidewall height and speedometer error.
Electricity and Energy Calculators
Personal Finance Calculators
Credit Card Payoff Calculator
Credit card payoff calculator: how many months to pay off a balance and the total interest at your APR and monthly payment.
401(k) Calculator
401(k) calculator: project your retirement balance with salary contributions, employer match and investment growth.
403(b) Calculator
403(b) calculator: project the retirement balance of a teacher, nonprofit or hospital worker from contributions, employer match and growth.
How Long Will My Money Last Calculator
How long will my money last in retirement? Enter savings, monthly withdrawals, returns and inflation to see the age your money runs out.
Social Security Break-Even Calculator
Social Security break-even calculator: compare claiming at 62, 67 or 70 and find the age when waiting pays off.
Inflation Calculator
Inflation calculator: compare past dollars with the latest available annual CPI-U data from the Bureau of Labor Statistics.
RMD Calculator
RMD calculator for 2026: estimate your required minimum distribution from a traditional IRA or 401(k) using the IRS Uniform Lifetime Table.
Roth IRA Calculator
Roth IRA calculator for 2026: project your tax-free retirement balance from contributions, growth rate and years invested.
QQQI Dividend Calculator
QQQI dividend calculator: estimate monthly and annual income from the NEOS Nasdaq-100 High Income ETF based on shares and distribution rate.
Loan Payment Calculator
Loan payment calculator: find the monthly payment, total interest and total cost of any fixed-rate personal or business loan.
Compound Interest Calculator
Compound interest calculator: see how savings or investments grow with monthly, quarterly or daily compounding over time.
Simple Interest Calculator
Simple interest calculator: interest on a principal amount at a fixed annual rate, with no compounding.
Savings Goal Calculator
Savings goal calculator: the monthly deposit you need to reach a target such as an emergency fund or down payment.
Discount Calculator
Discount calculator: final sale price and savings after a percent-off discount, with optional sales tax.
Tip Calculator
Tip calculator: work out the tip and split the bill per person at 15%, 18%, 20% or any custom percentage.
ROI Calculator
ROI calculator: return on investment as a percentage, plus the annualized return over a holding period.
XIRR Calculator
XIRR calculator: find the annualized return of up to three cash flows made on different dates, solved by Newton's method.
Ramsey Investment Calculator
Ramsey investment calculator: project retirement savings growth using the 12% average annual return rule of thumb popularized by Dave Ramsey.
Savings Bond Calculator
Savings bond calculator: estimate the current value of an EE or I bond from its purchase price, interest rate and years held.
CD Calculator
CD calculator: see how much a certificate of deposit earns at your rate and term, with the APY, interest earned and ending balance.
Dividend Calculator
Dividend calculator: turn shares and dividend per share into annual, quarterly and monthly income, plus dividend yield and position value.
Markup Calculator
Markup calculator: set a selling price from cost and markup percent, and see profit and gross margin side by side to avoid underpricing.
APR Calculator
APR calculator: find the true annual percentage rate of a loan once fees are included, plus total interest and cost.
Loan Payoff Calculator
Loan payoff calculator: see how extra monthly payments shorten your payoff date and how much interest you save.
Options Profit Calculator
Options profit calculator: find profit, loss, break-even and return for a long call or put at expiration.
Amortization Calculator
Amortization calculator: see your monthly payment, total interest and payoff date, and how extra payments shorten the loan.
Retirement Calculator
Retirement calculator: project your savings at retirement age and the monthly income they could support using the 4% rule.
Debt-to-Income Ratio Calculator
Debt to income ratio calculator: divide monthly debt payments by gross income to see your DTI and how lenders may view it.
Student Loan Calculator
Student loan calculator: estimate your monthly payment, total interest and payoff time, and see how extra payments cut both.
Margin Calculator
Margin calculator: enter cost and selling price to get gross profit, gross margin percentage and the matching markup percentage.
Civic and Election Calculators
Electoral College Calculator
Electoral College calculator: assign each state to a party and see who reaches 270 electoral votes under the 2024-2032 map.
AFT Score Calculator 2026
AFT score calculator for 2026: estimate your Army Fitness Test score and pass/fail status from your five-event raw results.
Army Height and Weight Calculator
Compare a rough weight estimate by height, age and sex; this Army height and weight calculator is not an official AR 600-9 lookup.
GS Pay Scale Calculator 2026
GS pay scale calculator for 2026: estimate your federal General Schedule base salary plus locality pay by grade, step and locality area.
Math Calculators
Percentage Calculator
Percentage calculator: find X% of any number, or what percent one number is of another.
Percent Change Calculator
Percent change calculator: percentage increase or decrease between an old value and a new value.
Fraction Calculator
Fraction calculator: add, subtract, multiply or divide two fractions and get the answer in lowest terms.
Average Calculator
Average calculator: the mean, sum, minimum and maximum of up to five numbers.
Ten Key Calculator
Ten key calculator: an online adding machine with a printed tape, running total and item count. Type straight from your number pad.
Quadratic Equation Calculator
Quadratic equation calculator: solve ax² + bx + c = 0 for real or complex roots, with the discriminant.
Double Integral Calculator
Double integral calculator: numerically evaluate ∫∫ f(x,y) dx dy over a rectangular region using Simpson's rule for a fast volume estimate.
Net Ionic Equation Calculator
Net ionic equation calculator: pick a common aqueous reaction and see the full molecular equation, spectator ions and net ionic equation.
Combined Gas Law Calculator
Combined gas law calculator: solve for the final pressure, volume or temperature using P1V1/T1 = P2V2/T2.
Moment of Inertia Calculator
Moment of inertia calculator: find I for a cylinder, sphere, rod or point mass from its mass and radius or length.
Center of Mass Calculator
Center of mass calculator: find the balance point of up to three masses from their weights and x, y positions.
AP Chem Score Calculator
AP Chem score calculator: estimate your AP Chemistry 1-5 score from multiple-choice and free-response points.
AP Physics 2 Score Calculator
AP Physics 2 score calculator: estimate your 1-5 score from multiple-choice and free-response points.
LCM Calculator
LCM calculator: find the least common multiple of two or three numbers, plus their greatest common factor, for fractions and homework.
GCF Calculator
GCF calculator: find the greatest common factor (GCD) of two or three numbers and see their LCM, with the steps explained simply.
Pythagorean Theorem Calculator
Pythagorean theorem calculator: find the hypotenuse or a missing leg of a right triangle, plus its area and perimeter, step by step.
Standard Deviation Calculator
Standard deviation calculator: enter up to five values to get sample or population standard deviation, variance and the mean.
Percent Error Calculator
Percent error calculator: compare a measured value with the true value to get percent error and absolute error for labs.
Percent Difference Calculator
Percent difference calculator: compare two numbers against their average to see how far apart they are as a percentage, with the formula.
Square Root Calculator
Square root calculator: get the square root, cube root and square of any number, and check whether it is a perfect square, free and fast.
Circumference Calculator
Circumference calculator: find the circumference, diameter and area of a circle from its radius or its diameter, with the formulas shown.
Scientific Notation Calculator
Scientific notation calculator: convert any number to scientific, E and engineering notation with its exponent.
Median Calculator
Median calculator: find the middle value, plus the range and quartiles, of up to six numbers.
Proportion Calculator
Proportion calculator: solve a/b = c/x for the missing value and see the cross-multiplication step.
Midpoint Calculator
Midpoint calculator: find the point halfway between two coordinates and the distance between them.
Log Calculator
Log calculator: find the logarithm of a number for any base, plus the common log and natural log.
Final Exam Grade Calculator
Final exam grade calculator: find the score you need on the final to reach the course grade you want.
GPA Calculator
GPA calculator: enter up to six courses with letter grades and credits to get your semester GPA and optional cumulative GPA.
Health and Fitness Calculators
BMI Calculator
BMI calculator in pounds, feet and inches: body mass index and the CDC weight category for adults.
Calorie Calculator
Calorie calculator: daily calories to maintain your weight, from your BMR (Mifflin-St Jeor) and activity level.
Ideal Weight Calculator
Ideal weight calculator: ideal body weight in pounds from your height, using the Devine formula.
Water Intake Calculator
Water intake calculator: how many ounces of water to drink per day based on your weight and exercise.
Starbucks Nutrition Calculator
Starbucks nutrition calculator: estimate calories, sugar and caffeine for a drink by size, milk choice and syrup pumps.
Conception Date Calculator
Conception date calculator: estimate when conception likely happened from your due date or the first day of your last period.
Max Heart Rate Calculator
Max heart rate calculator: estimate your maximum heart rate by age and see target zones from 50 to 85 percent for exercise.
Macro Calculator
Macro calculator: daily calories, protein, carbs and fat in grams for weight loss, maintenance or muscle gain.
A1C Calculator
A1C calculator: convert A1C percent to estimated average glucose in mg/dL and mmol/L, or the reverse, with the range.
FFMI Calculator
FFMI calculator: find your fat-free mass index and normalized FFMI from weight, height and body fat percentage.
Dog Age Calculator
Dog age calculator: convert your dog's age to human years by size, with the AVMA method and the newer DNA-based formula.
TDEE Calculator
TDEE calculator: estimate the calories you burn per day from age, height, weight and activity, plus targets to lose or gain weight.
BMR Calculator
BMR calculator: find your basal metabolic rate, the calories your body burns at rest, using Mifflin-St Jeor and Harris-Benedict.
Unit Converters
Length Converter
Length converter: convert inches, feet, yards and miles to and from millimeters, meters and kilometers.
Weight Converter
Weight converter: convert pounds, ounces and US tons to and from grams, kilograms and metric tons.
Temperature Converter
Temperature converter: convert Fahrenheit to Celsius, Celsius to Fahrenheit, and either to Kelvin.
Square Footage Calculator
Square footage calculator: find the area in square feet of a room from its length and width in feet or inches, for flooring, paint or rent.
F to C Calculator
F to C calculator: convert Fahrenheit to Celsius (and Kelvin) instantly, with the formula and a worked example.
mg to mL Calculator
mg to mL calculator: convert milligrams to milliliters using the density or concentration of the substance.
mL to mg Calculator
mL to mg calculator: convert milliliters to milligrams using the density or concentration of the substance.
Grams to Cups Converter
Grams to cups converter: convert grams of flour, sugar, butter and other ingredients to US cups, tablespoons and ounces.
Military Time Converter
Military time converter: change 24-hour time to 12-hour AM/PM and back, with the minutes since midnight and the spoken form.
Frequently asked questions
- How do I use one of the calculators?
- Choose a calculator from its category, enter or adjust the inputs, and review the results shown on its page.
- Are the values I enter sent to a server?
- No. Calculator inputs stay in your browser and are not sent anywhere.
- Are calculator results professional advice?
- No. Results are educational estimates, not professional tax, financial, medical or legal advice. Check important decisions with a qualified professional.