Browse Percentage Calculators

Pick the tool that matches the question you need to answer. Core arithmetic covers the formulas. Shopping, school, and stats tools use those same formulas with the labels you already search for.

Core arithmetic

The eight percentage operations most other tools are built from.

What is X percent of Y?

Find a percent of a number, such as 15% of 80.

X is what percent of Y?

Turn a part and a whole into a percentage.

Percentage increase and decrease

Measure how much a value changed from a starting point.

Percentage difference

Compare two numbers when neither is the starting value.

Reverse percentage

Recover the original amount before a percent was applied.

Increase or decrease by a percent

Add or subtract a percentage from a number.

Percent of a percent

Combine two percentages, or apply both to an amount.

Percent, decimal, and fraction converter

Switch among percent, decimal, and fraction forms.

Shopping and money

Prices, tips, tax, markup, margin, and profit.

Discount calculator

Sale price, percent off, or the original price before a discount.

Tip calculator

Tip amount, bill total, and an optional split.

Sales tax calculator

Add a tax percent, or work backwards to the pre-tax amount.

Markup calculator

Markup as a percent of cost, or a selling price from markup.

Margin calculator

Gross margin as a percent of selling price.

Profit percentage calculator

Profit amount plus profit on cost and on revenue.

School and stats

Grades, attendance, win rate, time, error, averages, and slope.

Marks percentage

Score obtained as a percent of total marks.

Attendance percentage

Days present as a percent of working days.

Winning percentage

Win rate from wins, losses, and optional ties.

Percentage of time

A duration as a percent of a longer period.

Percentage error

How far an experimental value is from an accepted value.

Average percentage

Simple or weighted mean of several percentages.

Slope percentage

Grade of a slope from rise over run.