This online percentage calculator makes percent calculations fast and easy. Find percent of a number, add or subtract percentage, calculate increase, decrease, or percent change between two values. Results update instantly as you type.
The calculator includes five calculation modes:
You can adjust the number of decimal places for precise results. Below you will find instructions and examples.
Select the calculation mode you need from the five available options.
Enter X and Y values in the corresponding input fields.
Use the "Decimal places" dropdown to adjust the number of decimal digits in the result.
The calculator updates results instantly as you type — no need to click any buttons.
Click on the result to copy it to clipboard.
Click "Clear" to reset a single block, or "Clear All" to reset all calculations.
Example 1
What is 58% of 240.2591? Round to 4 decimal places.
Result: 139.3503
Example 2
What percent is 258 of 457.2578? Round to 6 decimal places.
Result: 56.423313%
Example 3
Add 27% to 534. Round to 2 decimal places.
Result: 678.18
Example 4
Subtract 18% from 3587.4578. Round to 4 decimal places.
Result: 2941.7154
Example 5
What is the percentage change from 200 to 250? Round to 2 decimal places.
Result: 25% increase
What is 18% of 450?
1. Divide by 100: 450 / 100 = 4.5
2. Multiply by the percentage: 4.5 × 18 = 81
Result: 81
What percent is 45 of 500?
1. Divide the part by the whole: 45 / 500 = 0.09
2. Multiply by 100: 0.09 × 100 = 9
Result: 9%
Add 12% to 572
1. Calculate 12% of 572: 572 × 12 / 100 = 68.64
2. Add to the original: 572 + 68.64 = 640.64
Result: 640.64
Subtract 45% from 2870
1. Calculate 45% of 2870: 2870 × 45 / 100 = 1291.5
2. Subtract from the original: 2870 - 1291.5 = 1578.5
Result: 1578.5
The origins of percentage calculations go back to ancient Babylon. The word "percent" comes from Latin "per centum", meaning "per hundred" or "out of hundred". Babylonian cuneiform tablets that survived to this day show early calculations of yields and interest.
The second theory traces percentages to India, where accountants used the rule of three — a method based on proportions.
The third, and perhaps most reliable, origin comes from ancient Rome. Percentages emerged when the Roman Senate set limits on how much interest a creditor could charge a debtor.
