🧮 Calculators
Percentages, averages, BMI, age and everyday math, calculated live.
Percentage Calculator
Three percentage calculators in one: percent of a number, what percent, and percent change.
Average Calculator
Find the mean, median, mode and range of a set of numbers, plus min, max and sum.
BMI Calculator
Calculate body mass index in US units (feet, inches, pounds) or metric, with category.
Age Calculator
Calculate exact age in years, months and days from a birth date, plus next birthday.
Grade Calculator
Work out your weighted class grade from assignments, and what you need on the final.
GPA Calculator
Turn letter grades and credit hours into a GPA on the standard US 4.0 scale.
Sum Calculator
Add a list of numbers and get the total, count, average, minimum and maximum.
Rounding Calculator
Round a number to decimals, the nearest 10/100/1000, or significant figures.
Tip Calculator
Work out the tip and split the check between any number of people.
Discount Calculator
Find the sale price, what you save, and the original price before a markdown.
Hours Calculator
Add up hours worked between two times, minus breaks, in hours and minutes.
Date Calculator
Count the days between two dates, or add and subtract days from a date.
Compound Interest Calculator
See how savings grow with compound interest and regular contributions.
About these calculators
These calculators answer the everyday math questions: what 15% of a number is, the average of a list, your BMI in feet and pounds, your exact age in years and days, the score you need on a final exam. Each one computes live as you type and explains the formula, so you can see the working rather than just the answer.
Where it helps, you get the extra numbers too. The average calculator shows the median, mode and range beside the mean, and the grade calculator tells you what a target grade would take.