Calculate percentages quickly and easily. Find a percentage of a number, determine what percentage one number is of another, or calculate percentage increase and decrease.
A percentage tells you how big one number is compared to another, expressed as a fraction of 100. To find what percentage a "part" is of a "whole," divide the part by the whole and multiply by 100.
To find a percentage of a number, convert the percentage to a decimal fraction by dividing by 100, then multiply it by the number.
Percentage increase measures how much a value has grown, relative to where it started. Subtract the original value from the new value, divide by the original value, then multiply by 100.
Percentage decrease measures how much a value has fallen, relative to where it started. Subtract the new value from the original value, divide by the original value, then multiply by 100.
| Calculation | Answer |
|---|---|
| 10% of 100 | 10 |
| 15% of 200 | 30 |
| 20% of 500 | 100 |
| 25% of 200 | 50 |
| 30% of 300 | 90 |
| 50% of 500 | 250 |
| 75% of 400 | 300 |
A percentage is a way of expressing a number as a fraction of 100. The symbol "%" means "out of 100" — for example, 25% means 25 out of every 100.
Divide the percentage by 100, then multiply by the number: (Percentage ÷ 100) × Number. For example, 25% of 200 is (25 ÷ 100) × 200 = 50.
Divide the part by the whole, then multiply by 100: (Part ÷ Whole) × 100. For example, 50 is (50 ÷ 200) × 100 = 25% of 200.
Subtract the original value from the new value, divide by the original value, then multiply by 100: ((New − Original) ÷ Original) × 100. Going from 100 to 150 is a 50% increase.
Subtract the new value from the original value, divide by the original value, then multiply by 100: ((Original − New) ÷ Original) × 100. Going from 150 to 100 is a 33.33% decrease.
Yes. All four calculator modes accept decimal values, and results are rounded to two decimal places so answers stay easy to read.
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