Calculators

Find X% of a number, work out what percent one number is of another, or calculate the percent change between two values, instantly, in your browser.

e.g. Work out a restaurant tip or a sale discount from a percentage

Calculate a tip and split the total evenly between any number of people, with a slider, quick-pick percentages, and a live per-person breakdown, entirely in your browser.

e.g. Work out a fair tip and split a restaurant bill evenly among a group of friends

Work out a sale price and how much you'll save from an original price and discount percentage, or reverse-engineer the original price from a sale price, instantly, in your browser.

e.g. Check exactly what you'll pay and save before buying something advertised as a percentage off

Add sales tax onto a price, or back the pre-tax price out of a tax-included total; enter a price and tax rate and get both figures instantly, in your browser.

e.g. Work out the final price and tax amount before buying something, given a local sales tax rate

Work out interest earned (or owed) and the final amount from a principal, annual interest rate, and time in years, using I = P × r × t, instantly, in your browser.

e.g. Work out how much interest a fixed-rate savings amount or CD will earn over a known term

Work out how a principal grows with compound interest at a chosen compounding frequency, with a year-by-year growth table showing exactly how the balance builds up.

e.g. Project how a savings account, CD, or investment balance grows over a chosen term at a given rate

Work out the monthly contribution needed to hit a savings target by a deadline, or how long it'll take at a fixed monthly amount, with interest optional, instantly, in your browser.

e.g. Work out how much to set aside each month to afford a down payment, wedding, or vacation by a target date

Calculate a loan's fixed monthly payment from its principal, annual interest rate, and term, with a full month-by-month amortization schedule and a principal-vs-interest chart.

e.g. Work out the fixed monthly payment for a mortgage, auto loan, personal loan, or student loan

Work out total return on investment and annualized return (CAGR) from an initial investment, final value, and holding period, instantly, in your browser.

e.g. Check the overall percentage return on a stock, fund, property, or business investment

Work out how many units you need to sell, and how much revenue that takes, to cover your fixed costs, instantly, in your browser.

e.g. Figure out how many units a new product needs to sell to cover its fixed costs