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Quick percentage answers, without the messy math.

Calculate percent of a number, percentage change, reverse percentages, discounts, tax, VAT, markup, tips, grades, and more with clean formulas and copyable results.

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All-in-one percentage calculator

Choose the calculation that matches your question. The result updates instantly and can be copied.

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Percentage calculator cluster

Focused tools for shopping, taxes, business margins, grades, finance rates, and everyday math.

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P Percentage Change

Calculate percentage increase or decrease from an old value to a new value.

 R Reverse Percentage

Find the original value before a percentage increase, decrease, or percent-of relationship.

 D Discount Calculator

Calculate sale price, savings, and original price from discount percentages.

 S Sales Tax Calculator

Add or remove sales tax and estimate before-tax and after-tax prices.

 V VAT Calculator

Add or remove VAT and calculate net price, gross price, and VAT amount.

 M Markup Calculator

Calculate markup percentage, selling price, cost, and gross profit.

 P Profit Margin

Calculate profit margin, markup, revenue, cost, and profit.

 T Tip Calculator

Calculate tips, totals, and split bills quickly.

 G Grade Percentage

Convert test scores into percentages and letter-grade style ranges.

 P Percent Error

Calculate percent error between experimental and accepted values.

 B Basis Points

Convert basis points to percentages and decimal rates.

How percentage calculations work

A percentage expresses a value as a fraction of 100. The most common formula is:

percentage = part ÷ whole × 100

For example, 30 out of 150 is 30 ÷ 150 × 100 = 20%.

What makes this site different?

  • Multiple percentage intents on one focused homepage.
  • Dedicated pages for discount, VAT, sales tax, markup, margin, tips, grades, and basis points.
  • Result explanations, examples, formulas, and related next tools.
  • Clean ad-ready layout without ads blocking the calculation.

FAQ

Quick answers to common percentage questions.

What can this percentage calculator do?

It calculates percent of a number, what percent one number is of another, percentage change, increases, decreases, reverse percentages, and decimal/percent conversions.

What is the basic percentage formula?

The most common formula is part divided by whole, multiplied by 100. For example, 30 out of 150 is 30 ÷ 150 × 100 = 20%.

What is a reverse percentage?

A reverse percentage works backward from a final value. For example, if 120 is the result after a 20% increase, the original value was 120 ÷ 1.20 = 100.

Is percentage difference the same as percentage change?

No. Percentage change uses the old value as the reference. Percentage difference usually compares two values using their average as the reference.