Percentage Calculator — Percent Of, Change, Increase

What you can do

• •Percent of a number
• •Reverse percentage
• •Percent change between two values
• •Increase or decrease by a percent

How it works

1. 1

   Choose a mode

   Pick percent of, reverse, change, or increase/decrease.

2. 2

   Enter values

   Type the numbers; results update live.

3. 3

   Copy if needed

   Copy the primary result.

Common uses

• •Discounts and markups
• •Score percentages
• •Growth change between two figures
• •Percentage increase or decrease

Frequently asked questions

What percentage modes are included?

Five: what is P% of N, N is what percent of M (reverse percentage), percent change between two values, increase a value by a percent, and decrease a value by a percent. Results update as you type.

How do I calculate X% of a number?

Multiply the number by the percent and divide by 100 — 15% of 240 is 240 × 15 ÷ 100 = 36. Use the “percent of” mode and the calculator does it for you.

How is percent change calculated?

Percent change is (new − old) ÷ |old| × 100. Going from 80 to 100 is a 25% increase; going from 100 to 80 is a 20% decrease. The starting value cannot be zero, because dividing by zero has no meaningful percentage.

Can I calculate percentage increase or decrease?

Yes. Increase mode returns value × (1 + percent ÷ 100) and decrease mode returns value × (1 − percent ÷ 100), so you get the new amount rather than just the difference.

What is a reverse percentage?

It answers “this number is what percent of that number?” — for example 36 is 15% of 240. Use the reverse mode when you know both amounts and want the percentage between them.

Does it handle tax or stacked coupons?

No. It does one percentage operation at a time. For a straightforward sale price from a single percent off, the Discount Calculator is quicker.

Is my input uploaded?

No. Calculation runs in your browser. Values are not sent to NeedAnyTool servers or analytics.

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• Tip Calculator — Bill Total and Per Person
• Discount Calculator — Sale Price and Amount Saved
• Average Calculator — Mean, Median and Mode
• Basic / Simple Calculator Online

Related guides

• Percentage calculator online guide