Free Calculator Widgets

Calculate area of any shape: rectangle, square, circle, triangle, and trapezoid. Formulas included. Free area calculator for students and engineers. No sign-up.

Convert area: square meters, square feet, acres, hectares, square kilometers, and square miles. Free area converter with real-time results. No sign-up required.

Calculate mean, median, mode, range, and standard deviation from any numbers list. Free average calculator for students and professionals. No sign-up required.

Calculate your BMI instantly with WHO standards. Find your weight category and healthy weight range. Includes tips. Free bmi calculator, no sign-up required.

Calculate basal metabolic rate using the Mifflin-St Jeor formula. Find how many calories you burn at rest. Free bmr calculator online, no sign-up required.

Estimate body fat percentage via US Navy and BMI methods. Enter height, weight, and measurements for results. Free body fat percentage calculator, no sign-up.

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.

Find your daily calorie deficit for safe weight loss. Our calorie deficit calculator is based on TDEE with nutritionist targets. Free, no sign-up required.

Calculate compound interest with daily, monthly, or annual compounding. Includes Rule of 72 estimate. Free compound interest calculator online, no sign-up.

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.

Find sale price, savings, and discount for any price. Discount calculator for any percentage off. Perfect for shopping and retail. Free, no sign-up required.

Calculate your pregnancy due date using last menstrual period, conception date, or IVF transfer date. Get trimester dates and key milestones. Free & accurate.

Add, subtract, multiply, and divide fractions with automatic simplification. Get step-by-step fraction calculations instantly. Free fraction calculator.

Find ideal weight using 4 medical formulas: Robinson, Miller, Devine, and Hamwi. Get healthy weight range by height and sex. Free, no sign-up required.

Calculate how inflation erodes purchasing power between two years using a custom CPI rate. Free inflation calculator for any period. No sign-up required.

Calculate future value, total returns, and ROI with compound growth and contributions. Free investment calculator for any principal amount. No sign-up required.

Convert length: meters, feet, inches, centimeters, kilometers, miles, yards, and 15+ more. Free length converter with real-time results. No sign-up required.

Calculate monthly payment, total interest, and amortization schedule. Works for personal, auto, and student loans. Free loan calculator, no sign-up required.

Calculate monthly mortgage payment, total interest, and amortization schedule. Works for 15- and 30-year loans. Free mortgage calculator, no sign-up required.

Find ovulation date and fertile window based on last period and cycle length. Track conception with accurate predictions. Free ovulation calculator, no sign-up.

Calculate percentages instantly: % of a number, percent change, increase, and decrease. Free percentage calculator covering all 4 modes. No sign-up required.

Calculate your due date, current week of pregnancy, trimester, and key milestones. Based on last menstrual period or conception date. Free pregnancy tracker.

Calculate protein calculator accurately. Free, instant, no sign-up required.

Simplify ratios, solve proportions, and scale recipes with step-by-step solutions. Free ratio calculator for math, cooking, and design. No sign-up required.

Project retirement savings with compound growth and inflation adjustment. Estimate monthly income from your nest egg. Free retirement calculator, no sign-up.

Convert hourly to annual salary or annual to hourly. Get weekly, biweekly, and monthly earnings. Free salary calculator for any pay period. No sign-up.

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.

Convert to and from scientific notation. Add, subtract, multiply, and divide with step-by-step results. Free scientific notation calculator, no sign-up.

Find ideal bedtime or wake-up time based on 90-minute REM sleep cycles. Use our sleep calculator to wake up refreshed. Free online tool, no sign-up required.

Calculate 2024 US federal income tax, effective tax rate, marginal bracket, and take-home pay. Free income tax calculator by filing status. No sign-up required.

Calculate TDEE based on BMR and activity level. Find exact daily calorie needs for weight loss or gain. Free tdee calculator online, no sign-up required.

Convert between Celsius, Fahrenheit, Kelvin, and Rankine instantly. Accurate formula-based temperature conversion for any use case. Free, no sign-up required.

Calculate the tip amount, total bill, and split between people. Supports custom tip %, pre-tax tipping, and bill splitting for any group size. Free.

Add or remove VAT from any price instantly. Supports inclusive and exclusive modes with EU rates: 5%, 10%, 20% and custom. Free vat calculator, no sign-up.

Calculate volume of cube, sphere, cylinder, cone, and rectangular prism with formulas. Free volume calculator for math and engineering. No sign-up required.

Convert volume units: liters, gallons, milliliters, cups, fluid ounces, cubic meters, and cubic feet. Free volume converter for 10+ units. No sign-up required.

Convert weight units instantly: kilograms, pounds, ounces, stones, grams, and tons. Accurate results for 10+ units. Free weight converter, no sign-up required.