🔍

Percentage Calculator – Calculate percentages, increases, decreases, and more

Calculate percentages, increases, decreases, and more

How to Use This Tool

Enter your numbers and select the percentage calculation you need (like “X% of Y” or percentage change), then calculate the result.

When Should You Use This Tool?

Use this for discounts, tax, markups, grade calculations, and quick business math.

Steps

  1. Enter the values.
  2. Choose the calculation type/options.
  3. Calculate.
  4. Copy the result if needed.

See also: Unit Converter, Coin Flip .

Result:

What is a Percentage Calculator?

A Percentage Calculator solves the most common percentage problems in a single click. Instead of remembering formulas or reaching for a pen, just select the type of calculation you need, enter your numbers, and get an instant result. This tool covers five distinct percentage calculations that cover virtually every real-world scenario.

The Five Calculation Types

  • What is X% of Y? — The most fundamental percentage calculation. Example: "What is 20% of 85?" → 17. Used for discounts, tax amounts, tip calculations, and commission values.
  • X is what % of Y? — Finds the percentage one number represents of another. Example: "17 is what % of 85?" → 20%. Used for grades, market share, and progress tracking.
  • X increased by Y% = ? — Applies a percentage increase to a value. Example: "£120 increased by 15%" → £138. Used for price markups, salary raises, and growth projections.
  • X decreased by Y% = ? — Applies a percentage decrease to a value. Example: "£120 decreased by 15%" → £102. Used for discounts, depreciation, and budget cuts.
  • Percentage change from X to Y? — Calculates the percentage difference between two values, showing whether it is an increase or decrease. Example: "From 80 to 92" → 15% increase. Used for comparing performance, prices, or statistics over time.

Everyday Use Cases

  • Shopping discounts: Quickly calculate the sale price after a percentage off
  • Tax & VAT: Find out how much tax is owed or what the pre-tax price was
  • Grades & scores: Convert raw scores to percentages for academic or test results
  • Business & finance: Calculate profit margins, markups, commission, and growth rates
  • Health & fitness: Track body weight change, calorie targets, or macro percentages
  • Statistics: Compare figures across periods — revenue growth, price inflation, survey results

Percentage Formula Reference

  • X% of Y: (X ÷ 100) × Y
  • X as % of Y: (X ÷ Y) × 100
  • Increase X by Y%: X × (1 + Y ÷ 100)
  • Decrease X by Y%: X × (1 − Y ÷ 100)
  • % change from X to Y: ((Y − X) ÷ X) × 100

Frequently Asked Questions

How do I calculate a discount?
Use "X decreased by Y%" — enter the original price as X and the discount percentage as Y. The result is the discounted price. For example, £200 decreased by 25% = £150.
How do I work out a percentage grade?
Use "X is what % of Y?" — enter your score as X and the total marks as Y. For example, 73 is what % of 90? = 81.1%.
What is the difference between percentage increase and percentage change?
"Increase by Y%" starts from a known value and applies a fixed rate. "Percentage change from X to Y" compares two actual values and tells you how much they differ as a percentage — it can be positive (increase) or negative (decrease).
Can I calculate VAT or sales tax with this tool?
Yes. To add tax to a price, use "X increased by Y%" where Y is the tax rate. To find a pre-tax price from a tax-inclusive amount, use "X decreased by Y%" — note this gives an approximation; the precise reverse calculation is Price ÷ (1 + rate/100).
Does the tool support decimal percentages?
Yes. You can enter decimal values in both fields (e.g. 8.5% or 1234.56) and the result will be calculated to two decimal places.

Related Tools

📏 Unit Converter 🪙 Coin Flip ⚖️ BMI Calculator 💧 Water Intake Calculator