All 93 Calculators
Every tool on the site, organized by category. Use the search to jump straight to what you need.
Financial Calculators24
Mortgage Calculator
Estimate your monthly mortgage payment, total interest, and amortization schedule.
Auto Loan Calculator
Estimate your monthly car payment, total interest, and the true total cost of a vehicle.
Loan Calculator
Calculate the monthly payment, total interest, and payoff schedule for any loan.
Amortization Calculator
Generate a full amortization schedule showing principal, interest, and balance year by year.
Investment Calculator
Project how a starting balance plus monthly contributions grows at a given annual return.
Compound Interest Calculator
See how principal grows with daily, monthly, quarterly, or annual compounding, plus optional deposits.
Interest Calculator
Calculate simple or compound interest on any principal, rate, and time period.
Salary Calculator
Convert between hourly wages and annual salary, with daily, weekly, and monthly equivalents.
Payment Calculator
Solve for a monthly payment from a loan term, or find how long a fixed payment takes to pay off a loan.
Sales Tax Calculator
Add sales tax to a price or back out the tax included in a total.
Inflation Calculator
See how inflation erodes buying power or raises future prices over time.
401k Calculator
Project your 401k balance at retirement including employer match and salary growth.
CD Calculator
Calculate what a certificate of deposit will be worth at maturity and the interest earned.
Margin Calculator
Find gross margin and markup from cost and revenue, or price a product from a target margin.
Percent Off Calculator
Find the sale price after a percent-off discount, with optional stacked discount and sales tax.
Paycheck Calculator
Estimate your take-home pay per paycheck after 2025 federal, state, and FICA taxes.
Credit Card Payoff Calculator
See how long it takes to pay off your credit card and how much interest you will pay.
IRA Calculator
Project how your IRA grows to retirement from contributions and compound returns.
Markup Calculator
Find selling price from cost plus markup %, or the markup percentage between cost and price.
Pay Raise Calculator
See your new salary and the extra pay per year, month, and hour after a raise.
Time and a Half Calculator
Find your time-and-a-half rate and total overtime pay for any hourly wage.
Prorated Rent Calculator
Work out partial month rent, the daily rate, and days owed from your move-in date.
Coast FIRE Calculator
Find the invested amount that lets you stop contributing and still retire on time.
CPM Calculator
Solve for CPM, campaign cost, or impressions using the cost-per-mille formula.
Health & Fitness Calculators16
Calorie Calculator
Find your daily calorie needs to maintain, lose, or gain weight.
BMI Calculator
Calculate your body mass index and see the healthy weight range for your height.
Body Fat Calculator
Estimate your body fat percentage from tape measurements using the U.S. Navy method.
BMR Calculator
Estimate the calories your body burns at rest and at each activity level.
TDEE Calculator
Find your total daily energy expenditure and maintenance calories.
Macro Calculator
Get daily protein, carb, and fat targets in grams for your goal.
Ideal Weight Calculator
Find your ideal body weight from four medical formulas and the healthy BMI range.
Calories Burned Calculator
Estimate calories burned for 10 common activities using MET values, weight, and duration.
Protein Calculator
Calculate your daily protein target by body weight and training goal, with per-meal amounts.
Pregnancy Due Date Calculator
Estimate your due date, current pregnancy week, and trimester milestones.
Ovulation Calculator
Estimate your ovulation date, fertile window, and next period from your cycle.
Pace Calculator
Solve for running pace, time, or distance, with race projections for 5K to marathon.
Peptide Calculator
Reconstitute a peptide vial and convert your dose to insulin-syringe units.
A1C Calculator
Convert between A1C and estimated average glucose (eAG), with ADA interpretation bands.
FFMI Calculator
Calculate your fat-free mass index (FFMI) and normalized FFMI to gauge muscularity.
Body Shape Calculator
Determine your body shape from bust, waist, and hip measurements, with your waist-to-hip ratio.
Math Calculators15
Percentage Calculator
Calculate percent of a number, what percent one number is of another, or percentage change.
Fraction Calculator
Add, subtract, multiply, or divide two fractions and get a simplified answer with decimal.
Ratio Calculator
Solve A:B = C:D for the missing value and simplify any ratio to lowest terms.
Proportion Calculator
Enter three of the four values in a/b = c/d and solve the missing one by cross multiplication.
Average Calculator
Find the mean, median, mode, sum, and range of any list of numbers instantly.
Standard Deviation Calculator
Compute sample or population standard deviation, variance, and mean from a list of numbers.
Slope Calculator
Find the slope, line equation, and angle of incline from two points.
Pythagorean Theorem Calculator
Solve a² + b² = c² for the hypotenuse or a missing leg of a right triangle.
Circle Calculator
Find area, circumference, radius, and diameter of a circle from any one value.
Volume Calculator
Find the volume and surface area of cubes, cylinders, spheres, cones, and more.
Molarity Calculator
Solve for molarity, mass, volume, or a dilution using M = mol/L and M1V1 = M2V2.
Area Calculator
Compute the area of rectangles, triangles, circles, trapezoids, and more.
Percentage Increase Calculator
Find the percentage increase or decrease between an initial and final value.
LCM Calculator
Find the least common multiple (LCM) of two or more numbers, with prime factorizations.
GCF Calculator
Find the greatest common factor (GCF/GCD) of two or more numbers, with factor lists.
Date & Time Calculators8
Age Calculator
Find your exact age in years, months, and days — plus a countdown to your next birthday.
Date Calculator
Find the difference between two dates, or add and subtract days, weeks, months, or years.
Days From Today Calculator
Find the exact calendar date any number of days from today — calendar or business days.
Time Calculator
Add or subtract two times in hours, minutes, and seconds — with decimal conversions.
Time Duration Calculator
Find the exact hours and minutes between a start and end time — overnight shifts included.
Hours Calculator
Count hours worked between clock-in and clock-out, minus breaks — with optional pay.
Time Card Calculator
Total a weekly timesheet from daily in/out times, with breaks, overtime, and gross pay.
Day Counter
Count the days between two dates — total days, weekdays, weekends, and weeks.
Unit Converters6
Unit Converter
Convert between metric and imperial units of length, weight, temperature, volume, area, and speed.
Length Converter
Convert between millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles.
Weight Converter
Convert between milligrams, grams, kilograms, metric tons, ounces, pounds, and stones.
Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin with the exact formulas shown.
Cooking Converter
Convert US kitchen measures — teaspoons, tablespoons, cups, fluid ounces, pints, quarts, gallons, and milliliters.
Height Converter
Convert height between centimeters and feet & inches, with results in every format.
Construction Calculators8
Gravel Calculator
Find how much gravel you need in cubic yards and tons for any length, width, and depth.
Cubic Yard Calculator
Convert length, width, and depth into cubic yards for concrete, mulch, gravel, or soil.
Cubic Feet Calculator
Get the volume of any box shape in cubic feet, cubic yards, cubic meters, liters, and gallons.
Asphalt Calculator
Convert driveway dimensions into tons of hot-mix asphalt, cubic yards, and estimated cost.
Board Foot Calculator
Calculate board feet and total lumber cost from thickness, width, length, and quantity.
Stair Calculator
Turn a total rise into risers, treads, exact riser height, total run, and stringer length.
Roof Pitch Calculator
Convert rise and run to roof pitch, or any x/12 pitch to degrees, slope %, and rafter length.
Drywall Calculator
Estimate drywall sheets, joint compound, tape, and screws for any room from its dimensions.
Everyday Calculators16
GPA Calculator
Compute your GPA on the 4.0 scale from letter grades and credit hours.
Grade Calculator
Find your weighted course grade and the score you need on the final exam.
Tip Calculator
Calculate the tip, total bill, and per-person share for any tip percentage.
Fuel Cost Calculator
Estimate the gas cost of any trip from distance, MPG, and fuel price.
Square Footage Calculator
Find the square footage of any room or area, with unit conversions and cost.
Love Calculator
Enter two names and get a playful love compatibility percentage.
Random Number Generator
Generate random numbers in any range — for raffles, games, and sampling.
Dice Roller
Roll virtual dice from d4 to d100 — single dice or full handfuls with totals.
Password Generator
Generate strong random passwords with custom length and character sets.
Scientific Calculator
Full scientific calculator with trig, logs, powers, roots, and factorial.
Gematria Calculator
Decode any word or name into English ordinal, full reduction, and English (A=6) gematria values.
Puppy Weight Calculator
Estimate your puppy’s adult weight from its current weight, age, and breed size.
ABV Calculator
Turn your original and final gravity readings into ABV, attenuation, and calories.
Rounding Calculator
Round any number to a chosen place value or significant figures, in four rounding modes.
AP Score Calculator
Estimate your 1–5 AP exam score from practice-test multiple-choice and FRQ points.
SAT Score Calculator
Convert digital SAT raw scores into section scores, a 400–1600 total, and a percentile.