Calculators
Quick, accurate calculators for everyday use. Calculate percentages, BMI, age, pace, GPA, unit conversions, and more — all in your browser.
Percentage Calculator — 3 Ways to Calculate Percentages
Calculate what percent of a number is, find a percentage change between two values, or determine what percent one number is of another. Three calculators in one. Free.
Ratio Calculator — Simplify Ratios & Solve Proportions
Simplify any ratio to its lowest terms, solve proportions, or find the missing value in A:B = C:X. Enter any three values to solve for the fourth. Free.
Age Calculator — Exact Age in Years, Months & Days
Calculate your exact age in years, months, and days from any date of birth. Also shows your next birthday and how many days until it. Free, instant results.
Days Until Date Calculator — Countdown to Any Date
Count the exact number of days, weeks, and months until any future date. Great for countdowns, deadlines, and event planning. Updates in real time. Free.
Time Duration Calculator — Add & Subtract Time Online
Add or subtract time durations in hours, minutes, and seconds. Find elapsed time between two clock times or total up a list of intervals. Free.
BMI Calculator — Body Mass Index, Metric & Imperial
Calculate your BMI instantly using metric (kg/cm) or imperial (lbs/ft) units. See your Body Mass Index, weight category, and healthy weight range. Free.
Calorie Calculator — Daily Calorie Needs by Goal
Calculate your daily calorie needs based on age, height, weight, and activity level. See targets for weight loss, maintenance, and muscle gain. Free.
GPA Calculator
Calculate your GPA from course grades and credit hours. Supports letter grades and 4.0 scale.
Pace Calculator
Calculate running pace, speed, or finish time given any two of distance, time, or pace.
Unit Converter — Length, Weight, Temperature & More
Convert between metric and imperial units for length, weight, and temperature. Handles meters, feet, kg, pounds, Celsius, Fahrenheit, and more. Free.