All Calculators
Free precision tools for finance, health, and everyday math. Pick a category or search for what you need.
Math & General
Percentage, age, GPA, IQ test, area, slope, and more everyday math tools.
Age Calculator
Calculate your exact age in years, months, and days. Find the time between any two dates with precision, including total days, weeks, and months lived.
Percentage Calculator
Calculate percentages three ways: find what percent of a number is, find what percentage one number is of another, or calculate percentage change between two values.
GPA Calculator
Calculate your college GPA on a 4.0 scale. Add courses with grades and credit hours to see your weighted GPA, honors level, and total grade points. Reverse mode: find what grades you need to reach a target GPA.
IQ Test
Take a free online IQ test with 18 timed questions across pattern recognition, number sequences, verbal analogies, and logical reasoning. Get your estimated IQ score, percentile rank, bell curve visualization, and score comparison across Wechsler, Stanford-Binet, and Cattell scales.
Area Calculator
Calculate the area of common geometric shapes including rectangles, triangles, circles, trapezoids, ellipses, and parallelograms.
Scientific Notation Calculator
Convert between standard numbers and scientific notation. Enter a number to see its scientific notation, or enter a coefficient and exponent to get the full number.
Exponent Calculator
Calculate the power of any base raised to an exponent. Supports negative exponents, fractional exponents, and zero. See step-by-step rules applied.
Slope Calculator
Calculate the slope, equation, distance, and midpoint between two points. Enter coordinates (x₁, y₁) and (x₂, y₂) to find the line equation y = mx + b.
Pythagorean Theorem Calculator
Use the Pythagorean theorem to find missing triangle sides. Calculate the hypotenuse from two sides, or find a missing side from the hypotenuse and one side.
Math & General Calculators
Free calculators for percentages, geometry, GPA, IQ testing, exponents, scientific notation, and everyday math problems.
Finance
Mortgage payments, compound interest, debt payoff, profit margins, salary conversions, and more.
Profit Margin Calculator
Calculate gross profit margin, net profit margin, and markup percentage. Enter cost and revenue to see your margins with a full breakdown of profit, cost ratio, and markup.
Debt Payoff Calculator
Plan your debt-free date with avalanche and snowball payoff strategies. Enter your debts to see monthly payments, total interest paid, and a full amortization schedule with interactive charts.
Markup Calculator
Calculate selling price from cost and markup percentage. See your equivalent profit margin, dollar profit, and how your markup compares to industry benchmarks for retail, restaurants, SaaS, and more.
Compound Interest Calculator
Calculate compound interest with monthly contributions, multiple compounding frequencies, and inflation adjustment. See a year-by-year growth chart, milestone markers, and your real purchasing power over time.
Discount Calculator
Calculate the final price after percentage, fixed, or buy-X-get-Y discounts. Stack multiple discounts, add sales tax, and compare deals from different stores side by side to find the best price.
APY Calculator
Calculate Annual Percentage Yield (APY) from a nominal interest rate and compounding frequency. Convert between APY and nominal rates. Compare savings accounts side by side with a visual chart.
Salary to Hourly Calculator
Convert between annual salary and hourly wage. See your pay broken down by hour, day, week, biweekly, month, and year with customizable hours and weeks.
Mortgage Calculator
Calculate your monthly mortgage payment with full PITI and PMI breakdown. Check how much house you can afford based on income, or compare refinancing options with break-even analysis and visual charts.
Finance Calculators
Free online finance calculators for mortgages, compound interest, debt payoff, profit margins, APY, salary conversion, and more.
Health & Nutrition
TDEE, calorie deficit, macros, BMI, body fat, and BMR — evidence-based formulas for nutrition and fitness.
Body Fat % Calculator
Estimate your body fat percentage using the U.S. Navy method, Army method, or basic measurement method. Enter your measurements to get an accurate estimate with health range interpretation.
BMI Calculator
Calculate your Body Mass Index (BMI) in metric or imperial units. See your BMI category, BMI Prime, healthy weight range for your height, and a visual gauge showing where you fall.
Calorie Calculator
Find out how many calories you should eat per day. Interactive goal quiz routes you to the right calculator — BMR, TDEE, calorie deficit, or macro calculator.
BMR Calculator
Calculate your Basal Metabolic Rate using the Mifflin-St Jeor equation. Find out how many calories your body burns at rest based on your age, weight, height, and sex.
TDEE Calculator
Calculate your Total Daily Energy Expenditure — the total calories you burn per day based on your BMR and activity level. See how different activity levels affect your calorie needs.
Calorie Deficit Calculator
Calculate your daily calorie target for weight loss, muscle gain, or maintenance. See a 12-week weight projection based on your chosen rate of change.
Macro Calculator
Calculate your daily protein, carb, and fat targets in grams. Uses a protein-first approach tailored to your goal — weight loss, maintenance, or muscle gain.
TDEE Calculator for Women
Calculate your Total Daily Energy Expenditure with female-specific defaults and guidance. Find how many calories you burn per day based on your activity level.
TDEE Calculator for Men
Calculate your Total Daily Energy Expenditure with male-specific defaults and guidance. Find how many calories you burn per day based on your activity level.
Calorie Calculator for Weight Loss
Find exactly how many calories to eat per day to lose weight safely. Set your target rate and see a 12-week projection of your weight loss journey.
Calorie Calculator for Muscle Gain
Calculate the controlled calorie surplus you need to build muscle without excess fat gain. See your daily target and macro recommendations.
Health & Nutrition Calculators
Free evidence-based calculators for TDEE, calories, macros, BMI, body fat, and BMR. Peer-reviewed formulas for nutrition and fitness goals.
Baby & Parenting
Due date, growth percentiles, feeding guides, sleep schedules, and child height prediction backed by WHO data.
Due Date Calculator
Calculate your estimated due date from your last menstrual period (LMP), conception date, IVF transfer date, or ultrasound measurements. See trimester timeline, key milestones, and a week-by-week countdown.
Baby Growth Percentile Calculator
Track your baby's growth using WHO standards. Enter weight, length, or head circumference to see percentile rankings, z-scores, and growth status from birth to 24 months.
Baby Feeding Calculator
Calculate how much your baby should eat based on age and weight. Get feeding schedules for formula, breastfeeding, and solids introduction with portion sizes and daily totals.
Baby Sleep Calculator
Find the recommended sleep schedule for your baby's age. See total sleep hours, nap frequency, wake windows, and a sample daily schedule from newborn to 24 months.
Diaper Cost Calculator
Estimate your total diaper costs from birth through potty training. Compare disposable, cloth, and hybrid options with monthly and yearly cost breakdowns by diaper size stage.
Baby Name Numerology Calculator
Discover the numerology behind any baby name. Calculate Expression, Soul Urge, and Personality numbers using Pythagorean numerology, with optional Life Path number from birth date.
Child Height Predictor
Predict your child's adult height using the mid-parental method or Khamis-Roche method. Enter parent heights and optional child measurements to see estimated adult height with range and percentile.
Baby & Parenting Calculators
Free pregnancy and parenting calculators — due date, growth percentiles, feeding guides, sleep schedules, and more. Backed by WHO and pediatric research.