Calculators
Quick calculators for everyday life: BMI, percentages, discounts, splitting the bill, unit conversion and more. Results update as you type, and each tool explains the formula behind the number.
Online Calculator A full-size calculator that works on any device: switch between basic and scientific modes, type with your keyboard, and reuse earlier answers from the history list. Tip Calculator Enter the bill, choose a tip percentage and how many people are paying. You get the tip, the total and exactly what each person owes, with optional rounding to whole dollars. BMI Calculator Enter your height and weight to see your body mass index, where it falls on the WHO scale, and the healthy weight range for your height. Mortgage Calculator Estimate your monthly house payment, including principal, interest, property tax, homeowners insurance and HOA dues, and see how much interest you will pay over the life of the loan. GPA Calculator Add your classes with a letter grade and credits to see your GPA on the 4.0 scale, weighted for Honors and AP, your new cumulative GPA, and what you need to hit a target. Sales Tax Calculator Add sales tax to a price or take it out of a total. Pick a state for its 2026 statewide rate, or type the combined state and local rate from your receipt. Fraction Calculator Type two fractions, mixed numbers or decimals and pick an operation. You get the answer in lowest terms, as a mixed number and as a decimal, with every step written out. Percentage Calculator Four common percentage problems on one page, each with the formula written out: a percent of a number, what share one number is of another, percent change, and adding or removing a percentage. Unit Converter Convert between US customary and metric units in one place: length, weight, temperature, area, volume, speed and data. Results update as you type, with every unit listed side by side. Compound Interest Calculator See how a starting deposit and regular monthly savings grow when interest earns interest. Change the rate, years or compounding frequency and the year-by-year table updates instantly. Discount Calculator Find the sale price and your savings in seconds. Stack an extra coupon, compare BOGO and spend-and-save deals as a single percent off, and add sales tax to see what you will pay at the register. Split the Bill Calculator Enter the bill, the tax rate and the tip, and see exactly what each person owes. Split evenly or by what everyone ordered, with leftover cents handled for you.