Every calculator
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From mortgage payments to roofing materials, BMI to unit conversions — all the calculators you need, completely free.
⭐ Featured
Most used calculators
Mortgage Calculator
Calculate your monthly mortgage payment, total interest paid, and amortization schedule. Includes PMI, taxes, and insurance.
Compound Interest Calculator
Calculate compound interest growth over time. See how investments grow with daily, monthly, or annual compounding.
Retirement Savings Calculator
Project your retirement nest egg. Calculate how much you need to save and whether you're on track to retire comfortably.
Auto Loan Calculator
Calculate your monthly car payment with down payment, trade-in, sales tax, and interest. See total cost and interest over the loan term.
Credit Card Payoff Calculator
See how long it takes to pay off a credit card balance and how much interest you'll pay. Find the monthly payment to be debt-free by a target date.
Budget Calculator (50/30/20)
Split your after-tax income into needs, wants, and savings with the 50/30/20 rule. Adjust the percentages and see exactly where your money should go.
401(k) Calculator
Project your 401(k) balance at retirement, including employer match, annual raises, and investment growth. See how much your match is worth over time.
Home Affordability Calculator
Find out how much house you can afford based on income, debts, down payment, and rate. Uses the 28/36 rule lenders rely on for qualification.
Mortgages, loans, investments, and more
Loans & Debt
Mortgage Calculator
Calculate your monthly mortgage payment, total interest paid, and amortization schedule. Includes PMI, taxes, and insurance.
Auto Loan Calculator
Calculate your monthly car payment with down payment, trade-in, sales tax, and interest. See total cost and interest over the loan term.
Loan Calculator
Calculate loan payments, total interest, and payoff schedule for any loan — personal, auto, student, or business.
Credit Card Payoff Calculator
See how long it takes to pay off a credit card balance and how much interest you'll pay. Find the monthly payment to be debt-free by a target date.
Mortgage Payoff Calculator
See how extra monthly payments shorten your mortgage and cut total interest. Find your new payoff date and exactly how much you'll save.
Mortgage Refinance Calculator
Compare your current mortgage to a refinance. See your new monthly payment, monthly savings, closing-cost break-even point, and lifetime interest difference.
Homebuying & Real Estate
Home Affordability Calculator
Find out how much house you can afford based on income, debts, down payment, and rate. Uses the 28/36 rule lenders rely on for qualification.
Down Payment Calculator
Calculate your home down payment, resulting loan amount, and whether you'll need PMI. See how different down payment percentages change your costs.
Rental Property Calculator (Cap Rate & Cash-on-Cash)
Analyze a rental property's cap rate, cash-on-cash return, and monthly cash flow from the price, rent, expenses, down payment, and loan terms.
Saving & Budgeting
Budget Calculator (50/30/20)
Split your after-tax income into needs, wants, and savings with the 50/30/20 rule. Adjust the percentages and see exactly where your money should go.
Savings Goal Calculator
Find out how much to save each month to reach your goal, or how long your current plan will take. Accounts for interest on your savings.
Emergency Fund Calculator
Find out how big your emergency fund should be based on your monthly expenses, and how long it will take to fully fund it at your savings rate.
Net Worth Calculator
Add up your assets and subtract your liabilities to find your net worth. Track cash, investments, property, and debts in one place.
Investing & Retirement
Compound Interest Calculator
Calculate compound interest growth over time. See how investments grow with daily, monthly, or annual compounding.
Retirement Savings Calculator
Project your retirement nest egg. Calculate how much you need to save and whether you're on track to retire comfortably.
401(k) Calculator
Project your 401(k) balance at retirement, including employer match, annual raises, and investment growth. See how much your match is worth over time.
Roth IRA Calculator
Project your Roth IRA balance at retirement. See how tax-free contributions and growth add up over time, and how much of the balance is investment earnings.
FIRE Calculator
Find your FIRE number and how many years until you can retire early. Based on annual expenses, current savings, savings rate, and investment return.
ROI Calculator
Calculate return on investment (ROI) and annualized return. Enter your starting and ending values and time held to see total and yearly returns.
Interest & Rates
Simple Interest Calculator
Calculate simple interest with the I = P × r × t formula. Find the interest earned or owed and the total amount, and compare it to compound interest.
APR to APY Calculator
Convert between APR and APY for any compounding frequency. See the true annual yield once compounding is included — useful for loans, savings, and CDs.
Taxes
Paycheck Calculator (Take-Home Pay)
Estimate your take-home pay after federal income tax, Social Security, Medicare, and optional state tax and pre-tax deductions. Uses 2025 tax figures.
Income Tax Calculator (2025)
Estimate your 2025 federal income tax using the standard deduction and tax brackets by filing status. See your effective and marginal tax rates.
Tax Bracket Calculator (2025)
Find out which 2025 federal tax bracket you fall in and see your marginal and effective tax rates. Shows how much income is taxed at each rate.
Capital Gains Tax Calculator
Estimate tax on your investment profits. Compares short-term (taxed as ordinary income) vs long-term gains using the 2025 0%, 15%, and 20% brackets.
Self-Employment Tax Calculator
Calculate your 2025 self-employment tax (15.3% on 92.35% of net earnings) for Social Security and Medicare, including the deductible employer-half.
Income
Salary to Hourly Calculator
Convert an annual salary to an hourly wage and back. Enter hours per week and weeks per year to see hourly, weekly, monthly, and yearly pay.
Pay Raise Calculator
Calculate your new pay after a raise and the dollar increase per hour, week, month, and year. Enter a percentage raise or a new pay rate.
Overtime Pay Calculator
Calculate your total pay with overtime. Enter regular and overtime hours, your hourly rate, and the OT multiplier (1.5× or 2×) to see gross weekly pay.
Roofing, concrete, flooring, paint, and more
Roofing & Framing
Roofing Calculator
Calculate roofing materials needed — shingles, squares, underlayment, and ridge cap — for any roof shape and pitch.
Roof Pitch Calculator
Convert roof pitch between rise-over-run (x/12), degrees, and slope factor. Calculate rafter length from the run and pitch for any roof.
Pythagorean Theorem Calculator
Solve a right triangle with a² + b² = c². Find any missing side, plus the 3-4-5 method for squaring up foundations, decks, and walls.
Stair Calculator
Calculate stair rise, run, and stringer length from your total height. Get the number of steps and code-friendly riser and tread dimensions.
Woodworking
Board Foot Calculator
Calculate board feet of lumber for woodworking projects from thickness, width, and length. Get total board feet and cost across multiple boards.
Decking Calculator
Calculate how many deck boards you need from your deck size, board width, and gap spacing. Includes board count, total linear feet, and waste allowance.
Materials & Quantities
Concrete Calculator
Calculate cubic yards of concrete needed for slabs, footings, columns, and steps. Get material quantities and cost estimates.
Paint Calculator
Calculate how many gallons of paint you need for any room or surface. Accounts for doors, windows, and multiple coats.
Square Footage Calculator
Calculate the square footage of a room or area for rectangles, triangles, and circles. Add multiple areas and estimate material cost per square foot.
Brick Calculator
Calculate how many bricks you need for a wall from its area and the brick size, including mortar joints and a waste allowance.
Tile Calculator
Calculate how many tiles and boxes you need for a floor or wall from the area, tile size, and waste percentage. Get tile count and estimated cost.
Gravel Calculator
Calculate the cubic yards and tons of gravel or aggregate you need for a driveway, path, or area from its length, width, and depth.
BMI, calories, macros, due dates, and more
Body Composition
BMI Calculator
Calculate your Body Mass Index (BMI) and see what it means for your health. Supports both imperial and metric units.
Body Fat Calculator
Estimate your body fat percentage with the U.S. Navy method using height, neck, waist, and hip measurements. See your body fat category and lean mass.
Ideal Weight Calculator
Find your ideal body weight using the Devine, Robinson, Miller, and Hamwi formulas, based on your height and sex. Compare all four estimates side by side.
Lean Body Mass Calculator
Estimate your lean body mass (LBM) — total weight minus fat — using the Boer and James formulas from your height, weight, and sex.
Waist-to-Hip Ratio Calculator
Calculate your waist-to-hip ratio (WHR) and see your health-risk category by sex, based on World Health Organization thresholds.
Calories & Diet
Calorie Calculator
Calculate your daily calorie needs based on age, weight, height, activity level, and goal. Includes macronutrient breakdown.
TDEE Calculator
Calculate your Total Daily Energy Expenditure (TDEE) — the maintenance calories you burn each day — using the Mifflin-St Jeor equation and your activity level.
BMR Calculator
Calculate your Basal Metabolic Rate (BMR) — the calories your body burns at rest — using the Mifflin-St Jeor and Harris-Benedict equations.
Macro Calculator
Turn your daily calories into grams of protein, carbs, and fat. Pick a goal and macro ratio to get a personalized macronutrient breakdown for your diet.
Protein Intake Calculator
Calculate how much protein you should eat per day in grams, based on your weight, activity level, and goal — from general health to building muscle.
Water Intake Calculator
Find out how much water you should drink each day based on your body weight and activity level. Get your daily target in ounces, liters, and cups.
Fitness & Rest
Running Pace Calculator
Calculate your running pace, speed, and finish time. Enter a distance and time to get pace per mile and km, or predict a finish time from a target pace.
One Rep Max Calculator
Estimate your one-rep max (1RM) from the weight and reps you lifted using the Epley and Brzycki formulas. Includes a training percentage table from 60–95%.
Calories Burned Calculator
Estimate the calories you burn during any activity using MET values, your body weight, and the duration. Covers running, walking, cycling, weights, and more.
Target Heart Rate Calculator
Find your target heart rate training zones using the Karvonen (heart-rate reserve) method and percentage of max heart rate, based on your age and resting HR.
Sleep Calculator
Find the best time to go to bed or wake up based on 90-minute sleep cycles, so you wake up between cycles feeling more rested.
Pregnancy & Health
Pregnancy Due Date Calculator
Calculate your pregnancy due date, trimester dates, and key milestones from your last menstrual period or conception date.
Ovulation Calculator
Estimate your most fertile days and ovulation date from the first day of your last period and your average cycle length. See your fertile window and next period.
Blood Alcohol Content (BAC) Calculator
Estimate your blood alcohol content (BAC) with the Widmark formula from the number of drinks, your weight, sex, and time elapsed. For education only — never drink and drive.
Length, weight, temperature, volume, and more
Percentages, statistics, geometry, and more
Percentages & Money
Percentage Calculator
Calculate percentages, percent change, percent of a number, and more. Solves all common percentage problems instantly.
Percent Change Calculator
Calculate the percentage increase or decrease between two numbers. See the change as a percent and as an absolute difference, with the formula shown.
Markup & Margin Calculator
Calculate selling price, profit, markup, and margin from cost. Enter a markup percent, a margin percent, or a sale price to solve for the rest.
Ratio Calculator
Simplify a ratio A:B to lowest terms, or solve a proportion A:B = C:x to find the missing value. Also converts the ratio to a decimal and a percentage.
Arithmetic & Number Theory
Fraction Calculator
Add, subtract, multiply, and divide two fractions. Get the answer fully simplified, as a mixed number, and as a decimal — with the steps shown.
Fraction to Decimal Calculator
Convert a fraction to a decimal and a decimal back to a fraction. Detects repeating decimals and turns them into an exact fraction, fully simplified.
LCM & GCD Calculator
Find the least common multiple (LCM) and greatest common divisor (GCD) of two or more numbers, using the prime-factor and Euclidean methods.
Prime Factorization Calculator
Break any whole number into its prime factors and see the factorization in exponent form. Also checks whether a number is prime and lists all its divisors.
Exponent Calculator
Raise any base to any power, including negative and fractional exponents. Get the result plus the expanded form, and see what fractional powers mean as roots.
Logarithm Calculator
Calculate the logarithm of a number in any base, plus the natural log (ln) and common log (log₁₀). Uses the change-of-base formula and shows the steps.
Statistics
Mean, Median, Mode & Range Calculator
Paste a list of numbers to find the mean, median, mode, range, sum, and count instantly. Handles any separator — commas, spaces, or new lines.
Average Calculator
Find the average (mean) of a list of numbers, or compute a weighted average from values and weights. Shows the sum, count, and the result instantly.
Standard Deviation Calculator
Calculate the standard deviation and variance of a data set, for both a population and a sample. Also shows the mean, sum, and count of your numbers.
P-Value Calculator
Find the p-value from a z-score or t-statistic for a one- or two-tailed test. Uses an accurate normal CDF and Student-t distribution, with significance at α = 0.05.
Confidence Interval Calculator
Calculate a confidence interval for a mean (z when σ is known, t when it isn't) or for a proportion. Shows the margin of error and the lower and upper bounds.
Z-Score Calculator
Calculate the z-score of a value given the mean and standard deviation, and find the percentile and tail probabilities from the standard normal distribution.
Algebra
Scientific Calculator
A full scientific calculator with trig, log, ln, exponents, square root, π, e, and factorial. Respects order of operations (PEMDAS) on any expression.
Quadratic Formula Calculator
Solve any quadratic equation ax² + bx + c = 0 using the quadratic formula. Finds real or complex roots, the discriminant, and the vertex of the parabola.
Slope Calculator
Find the slope of a line from two points, plus the y-intercept, the equation y = mx + b, the angle, and the distance between the points.
Geometry
Area Calculator
Calculate the area of a rectangle, triangle, circle, trapezoid, or parallelogram. Pick a shape, enter the dimensions, and see the area and the formula.
Volume Calculator
Calculate the volume of a box, sphere, cylinder, or cone. Choose a shape, enter the dimensions, and get the volume with the formula used.
Circle Calculator
Enter any one of radius, diameter, circumference, or area, and instantly get the other three. Solves a complete circle from a single value.
Notation & Rounding
Significant Figures Calculator
Count the significant figures in any number and round it to a chosen number of sig figs. Shows the result in standard and scientific notation, with the rules explained.
Scientific Notation Calculator
Convert a number to and from scientific notation and standard form, and see it in E-notation and engineering notation. Handles very large and very small numbers.
Rounding Calculator
Round a number to the nearest 10, 100, 1000, or to a set number of decimal places. Choose round-half-up or round-half-to-even (banker's rounding).
Numbers & Motion
Random Number Generator
Generate one or more random numbers in any range. Choose integers or decimals and whether numbers can repeat — for draws, picks, and games.
Speed, Distance & Time Calculator
Solve for speed, distance, or time when you know the other two. Choose your units — miles or kilometers, hours or minutes — for travel and pace math.
Tips, GPA, dates, and useful daily tools
Dates & Time
Age Calculator
Calculate your exact age in years, months, and days from your date of birth — plus total weeks, days, and the countdown to your next birthday.
Date Calculator
Find the number of days between two dates, or add and subtract days, weeks, months, and years from any date. Includes a days-until countdown.
Time Duration Calculator
Calculate the hours and minutes between two times, or add and subtract time. Great for timesheets — optionally multiply by an hourly rate for pay.
Shopping & Money
Tip Calculator
Calculate tip amount and split the bill between multiple people. Works for restaurants, delivery, and any service.
Sales Tax Calculator
Add sales tax to a price or work backward from a total to find the pre-tax amount and the tax paid. Enter any tax rate.
Discount Calculator
Calculate the sale price and how much you save from a percent-off discount. Stack a second discount or add sales tax to get the final price.
Home & Car
Fuel Cost Calculator
Estimate the fuel cost of a trip from the distance, your vehicle's fuel economy, and the price of gas. Works for a one-way or round trip.
Gas Mileage Calculator
Calculate your vehicle's fuel economy in MPG (and L/100km) from the distance driven and the fuel used. Optionally see your cost per mile.
Electricity Cost Calculator
Find out what an appliance costs to run. Enter its wattage, how long it runs, and your electricity rate to get the daily, monthly, and yearly cost.
Kitchen & School
Cooking Measurement Converter
Convert between cups, tablespoons, teaspoons, fluid ounces, and milliliters, and scale a recipe up or down by servings.
GPA Calculator
Calculate your GPA for high school or college. Add courses, credits, and letter grades to get your weighted or unweighted GPA.
Final Grade Calculator
Find out what score you need on your final exam to reach the grade you want, based on your current grade and how much the final is worth.
Test Grade Calculator
Turn a number correct out of total questions into a percentage and letter grade. Includes a points-off mode and a full grading scale showing the score for each result.
Forces, energy, motion, electricity, waves, and gases
Mechanics
Force Calculator (F = ma)
Solve Newton's second law, F = ma, for force, mass, or acceleration. Enter any two values to find the third, in SI units (newtons, kg, m/s²).
Acceleration Calculator
Calculate acceleration from change in velocity over time, a = (v − u) / t, or from force and mass, a = F / m. Get results in m/s².
Velocity Calculator
Calculate final velocity with v = u + at, or average velocity from displacement and time. Enter your values to solve for speed in m/s.
Momentum Calculator
Calculate linear momentum with p = m·v and impulse as the change in momentum (J = Δp). Solve for momentum, mass, or velocity in SI units.
Density Calculator
Calculate density with ρ = m / V. Solve for density, mass, or volume by entering the other two values, with results in kg/m³ and g/cm³.
Free Fall Calculator
Calculate free-fall distance, velocity, and time under gravity with h = ½gt² and v = gt, using g = 9.80665 m/s². Enter any one value to find the rest.
Energy & Work
Kinetic Energy Calculator
Calculate kinetic energy with KE = ½mv². Solve for kinetic energy, mass, or velocity in SI units (joules, kg, m/s) by entering the other two.
Potential Energy Calculator
Calculate gravitational potential energy with PE = mgh. Solve for energy, mass, or height using g = 9.80665 m/s² and SI units.
Work and Power Calculator
Calculate work with W = F·d·cos θ and power with P = W / t. Find work done by a force at an angle and the power delivered over time, in SI units.
Electricity
Ohm's Law Calculator
Solve Ohm's law (V = I × R) for voltage, current, or resistance, and get the power (P = V × I). Enter any two values to find the rest.
Electrical Power Calculator
Calculate electrical power using P = VI, P = I²R, or P = V²/R. Enter any two of voltage, current, and resistance to find power and the remaining values.
Resistor Color Code Calculator
Decode 4-band and 5-band resistor color codes into resistance and tolerance. Pick each band's color to read the resistor's value in ohms instantly.
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Accurate formulas
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