Calculators. Quizzes. AI Coaching.
36+ free tools for health & finance — calculators, science-backed quizzes, and personal AI coaching. No registration. No ads.
Know Your Health Score
Free science-backed quizzes · Under 3 min · No account needed
Most Popular Calculators
36 calculators
BMI Calculator — Body Mass Index with Interpretation
Calculate your BMI instantly. Get WHO category, healthy weight range, BMI Prime, and AI-powered health interpretation — free, fast, and accurate.
Mortgage Calculator — Monthly Payment & Amortization
Calculate your monthly mortgage payment, total interest, and amortization schedule. Includes property tax and insurance estimates.
Percentage Calculator — 4 Modes, Free & Instant
Four percentage calculators in one: find % of a number, calculate % change, determine what % X is of Y, or adjust a value by any percentage. Free.
Loan Calculator — Monthly Payment & Total Interest
Calculate your monthly loan payment, total interest paid, and full cost of any fixed-rate loan. Works for personal loans, auto loans, and more.
Salary Calculator — Hourly to Annual Salary Converter
Convert hourly wage to annual salary or annual to hourly. Calculate weekly, biweekly, monthly, and yearly earnings instantly.
TDEE Calculator — Total Daily Energy Expenditure
Calculate your Total Daily Energy Expenditure (TDEE) based on your BMR and activity level. Know exactly how many calories you need per day.
Tax Calculator — US Federal Income Tax 2024
Calculate your 2024 US federal income tax, effective tax rate, marginal rate, and take-home pay based on your filing status and income.
Compound Interest Calculator — Watch Your Money Grow
Calculate compound interest over time with monthly contributions. See how your investment grows year by year with the power of compounding.
Area Calculator — Rectangle, Circle, Triangle & More
Calculate the area of any shape: rectangle, square, circle, triangle, trapezoid, and more. Instant results with formula explanations.
Area Converter — Convert m², ft², acres, hectares & more
Convert area units instantly: square meters, square feet, acres, hectares, square kilometers, square miles. Free area unit converter.
Average Calculator — Mean, Median, Mode & Range
Calculate the mean, median, mode, and range of any set of numbers instantly. Supports datasets of any size with step-by-step results.
BMR Calculator — Basal Metabolic Rate
Calculate your Basal Metabolic Rate (BMR) using the Mifflin-St Jeor equation. Find how many calories your body burns at complete rest.
Body Fat Calculator — Estimate Your Body Fat %
Calculate body fat percentage using the US Navy method. Enter neck, waist, and hip measurements for an accurate body composition estimate.
Calorie Calculator — Daily Calorie Needs for Weight Loss & Gain
Calculate your daily calorie needs using the Mifflin-St Jeor equation. Get personalized targets for weight loss, maintenance, and muscle gain. Free, no sign-up.
Calorie Deficit Calculator — How Many Calories to Lose Weight
Calculate the exact calorie deficit needed to reach your weight loss goal. Based on TDEE with safe deficit recommendations from nutritionists.
Currency Converter — Convert USD, EUR, GBP & 50+ Currencies
Convert between 50+ world currencies with up-to-date reference rates. USD to EUR, GBP to USD, EUR to UAH and more. Free currency conversion tool.
Discount Calculator — Final Price After Discount
Calculate the final price after applying any discount percentage. Also calculates how much you save and the effective discount rate.
Due Date Calculator — Calculate Your Baby's Due Date by LMP or Conception
Calculate your pregnancy due date using last menstrual period, conception date, or IVF transfer date. Get trimester dates and key milestones. Free & accurate.
Fraction Calculator — Add, Subtract, Multiply, Divide
Calculate fractions instantly. Add, subtract, multiply, and divide fractions with step-by-step solutions. Simplifies results automatically.
Ideal Weight Calculator — Find Your Healthy Weight
Calculate your ideal body weight using 4 medical formulas (Robinson, Miller, Devine, Hamwi). Get your healthy weight range by height and sex.
Inflation Calculator — Purchasing Power & CPI Adjustment
Calculate the adjusted value of money over time using a custom inflation rate. See how inflation erodes purchasing power between any two years.
Investment Calculator — Compound Growth & Return on Investment
Calculate how your investment grows with compound interest and monthly contributions. See your final value, total returns, and how long to double your money.
Length Converter — Convert Between All Units of Length
Convert between meters, feet, inches, miles, kilometers, centimeters, yards, and more. Instant results with precise conversion factors.
Ovulation Calculator — Fertile Window & Cycle Tracker
Find your ovulation date and fertile window based on your last period and cycle length. Plan or track conception with accurate menstrual cycle predictions.
Pregnancy Calculator — Due Date, Weeks Pregnant & Trimester
Calculate your due date, current week of pregnancy, trimester, and key milestones. Based on last menstrual period or conception date. Free pregnancy tracker.
Ratio Calculator — Simplify & Solve Ratios
Simplify ratios, solve proportions, and scale recipes or measurements. The fastest ratio calculator online with step-by-step solutions.
Retirement Calculator — Savings Projection & Monthly Income Estimate
Project your retirement savings with compound growth and monthly contributions. Estimate monthly income using the 4% rule and see real value in today's dollars.
Savings Calculator — How Much Will I Save? Growth & Interest Calculator
Calculate how your savings grow with compound interest and monthly deposits. See your final balance, total interest earned, and when you'll reach your goal.
Scientific Notation Calculator — Convert & Calculate
Convert numbers to and from scientific notation. Add, subtract, multiply and divide numbers in scientific notation instantly.
Sleep Calculator — Best Bedtime & Wake-Up Times by Sleep Cycles
Find the ideal bedtime or wake-up time based on 90-minute sleep cycles. Wake up refreshed by timing sleep to complete full REM cycles.
Temperature Converter — Celsius, Fahrenheit & Kelvin
Convert temperatures between Celsius, Fahrenheit, and Kelvin instantly. Includes body temperature, boiling/freezing points, and cooking temperature reference.
Tip Calculator — How Much to Tip? Split Bill & Tip Per Person
Calculate the tip amount, total bill, and split between people. Supports custom tip %, pre-tax tipping, and bill splitting for any group size. Free.
VAT Calculator — Add or Remove VAT Instantly
Add or remove VAT from any price. Supports all VAT rates (5%, 10%, 15%, 20%, 21%, 25%). Instant calculation for businesses and consumers.
Volume Calculator — Cube, Sphere, Cylinder & More
Calculate the volume of cubes, rectangular prisms, spheres, cylinders, cones, and pyramids. Instant results with formulas and practical examples.
Volume Converter — Liters, Gallons, ml, Cups & more
Convert volume units instantly: liters, gallons, milliliters, cups, fluid ounces, cubic meters, cubic feet. Free volume unit converter.
Weight Converter — Convert Between All Weight & Mass Units
Convert between kilograms, pounds, ounces, grams, stones, and more. Instant weight and mass conversions with precise factors for everyday and scientific use.