All Calculators
Free precision tools for finance, health, and everyday math. Pick a category or search for what you need.
General
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.
Finance
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.
Health & 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.