Percentage and everyday math calculators

Everyday percent math: what a discount really saves, how to split a tip, how much something changed.

Percentage CalculatorWork out any everyday percentage: a share of a number, what percent one number is of another, or how much something went up or down.
Percent Difference CalculatorCompare two values when neither one is the "starting" value, such as two measurements, two prices from different stores, or two lab results.
Tip CalculatorWork out the tip and each person's share in a couple of seconds.
Discount CalculatorFind the real price of a sale item, including "extra 10% off" deals and sales tax.
Sales Tax CalculatorAdd tax to a price, or strip it out of a total to find the pre-tax amount.