Percentage Calculator
Calculate percentages, convert raw scores to grades, and find percentage change. Instant results.
The percentage calculator handles three core calculations: finding a percentage of a number (e.g. 15% of 200 = 30), calculating what percentage one number is of another (e.g. 45 out of 60 = 75%), and computing percentage change between two values. It also converts raw exam scores to percentages and letter grades.
Convert a raw score to a percentage and letter grade
How to Use the Percentage Calculator
- 1Select the type of percentage calculation you need from the available options.
- 2Enter the required numbers in the input fields.
- 3Click Calculate to instantly see the result.
- 4Click Clear to reset and try a different calculation.
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Frequently Asked Questions
How do I calculate a percentage of a number?
To find X% of Y: multiply Y by X, then divide by 100. For example, 15% of 200 = (200 × 15) ÷ 100 = 30.
How do I calculate what percentage one number is of another?
Divide the first number by the second, then multiply by 100. For example, 45 out of 60 = (45 ÷ 60) × 100 = 75%.
How do I calculate percentage change?
Percentage change = ((New Value − Old Value) ÷ Old Value) × 100. A positive result is an increase; a negative result is a decrease.
How do I convert a raw exam score to a grade?
Divide your score by the total possible score, multiply by 100 to get the percentage, then check your institution's grading scale. For example, 42/50 = 84%.