Free Percentage Calculator
Calculate any percentage — find X% of Y, percentage change, increase/decrease, or reverse percentages.
Free, no signup — runs entirely in your browser with instant, copyable results.
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How to Calculate a Percentage
Answer any percentage question in three steps.
Pick a Mode
Choose what you want to find — X% of Y, percentage change, increase, decrease, or a reverse percentage.
Enter Your Numbers
Type the values into the fields. The calculator updates as you type, no button required.
Copy the Result
Read the precise answer and copy it to your clipboard for spreadsheets, invoices, or homework.
What is 20% of 50?
= 10
100 → 150 change?
+50%
6 Calculation Modes
Covers every common percentage question — from basic to reverse percentage calculations.
Instant Results
Get precise answers immediately with results you can copy to your clipboard.
High Precision
Up to 6 significant decimal places for accurate scientific and financial calculations.
Frequently Asked Questions
How do I calculate what percent one number is of another?
Divide the part by the whole and multiply by 100. For example, 30 out of 200 is (30 ÷ 200) × 100 = 15%. The calculator does this instantly — just enter both numbers.
How is percentage change calculated?
Percentage change is (new value − old value) ÷ old value × 100. A change from 100 to 150 is a 50% increase; from 150 to 100 is a 33.3% decrease.
What is a reverse percentage?
A reverse percentage finds the original amount before a percentage was applied — for example, the price before a 20% discount. Enter the final amount and the percentage to get the starting value.
How precise are the results?
Results are shown with up to 6 significant decimal places, which is accurate enough for financial, scientific, and everyday calculations. You can copy any result to your clipboard.
Is the Percentage Calculator free?
Yes. It is completely free with no signup, and every calculation runs entirely in your browser.
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