Percentage
Percentage calculators
Choose the percentage calculator that matches your question. Recover an original amount, apply a rate, compare values or rates, calculate a test score, or work with prices and bills.
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Core percentage calculators
Start with the question you want to answer. A percentage of a total and a change between two values use different bases.
Percentage Calculator
Find a percentage of a number, convert a score to a percentage, or compare percentage changes.
Find 20% of 80, or work out what percentage 18 is of 24. Also supports percentage change.
Percentage Increase Calculator
Calculate percentage increase or decrease between two values.
Compare an original value with a new value. From 80 to 100 is a 25% increase; from 100 to 80 is a 20% decrease.
Percentage Difference Calculator
Compare two nonnegative values using the percentage difference relative to their average.
Compare two nonnegative peer values using their mean as the base. The percentage difference between 80 and 100 is 22.22%.
Reverse Percentage Calculator
Find an original amount before a known percentage increase or decrease.
Recover the original amount before a known increase or discount. A final 80 after 20% off comes from 100.
Add or Subtract a Percentage Calculator
Apply a percentage increase or decrease to a starting amount.
Apply a known rate to a starting amount. Adding 25% to 80 gives 100; subtracting20%from 100 gives 80.
Percentage Points Calculator
Compare two rates in percentage points and relative percent change.
Compare two rates in points and relative percent change. From 10% to 15% is +5 points and +50% relative.
Shopping and money
Choose a task-specific tool for prices, bills or business figures. Check what each percentage is measured against.
Discount Calculator
Calculate sale price, savings, and final cost after a discount.
Find the sale price and savings after a percentage discount.
Tip Calculator
Calculate tip amount, total bill, and split cost per person.
Work out a percentage tip and split the total bill.
Profit Margin Calculator
Calculate gross profit, margin, markup, and break-even units from price, cost, and fixed costs.
Calculate profit margin from cost and selling price; compare margin with markup.
US Sales Tax Calculator
Calculate sales tax and the total price using a combined rate you enter.
US sales tax: add tax or find a before-tax price using a combined rate you enter. No automatic state or local rate lookup.
VAT Calculator
Add or remove VAT from a price using any VAT rate.
UK VAT: add or remove VAT using an entered rate. This tool does not calculate US state or local sales-tax rules.
Test scores and weighted averages
Convert earned or missed points into a test percentage, or combine numeric grades using their weights. Neither tool assumes a letter-grade or GPA scale.
Test Score Percentage Calculator
Convert points earned or points missed into a test percentage.
Convert earned or missed points to a score percentage. 42 of 50 is 84%; fractional points and extra credit are supported.
Weighted Average Calculator
Calculate a weighted average of numbers or percentage grades and see each normalized contribution.
Combine percentage grades with different weights, or find a weighted mean of numbers. Grades of 80 and 90 with weights of 20 and 80 average 88%.
Percentage guides
Use these step-by-step examples to understand the calculation behind the result.