Calculate percentages quickly with three modes: find a percentage of a number, determine what percent one number is of another, or compute the percentage change between two values.
15% of 200 = 30
Filled: 15 out of 100
Percentage
15%
Decimal
0.15
Fraction
3/20
10%
One-tenth
25%
One-quarter
33.3%
One-third
50%
One-half
66.7%
Two-thirds
75%
Three-quarters
100%
The whole
Your value (15.0%) is closest to one-tenth
A percentage is a way of expressing a number as a fraction of 100. It is one of the most commonly used math concepts in everyday life, from calculating tips and taxes to understanding discounts, interest rates, and statistical data. This calculator covers the three most common percentage operations so you can quickly solve any percentage problem.
Multiply the number by the percentage and divide by 100. For example, 15% of 200 is (200 × 15) / 100 = 30. This is useful for tips, discounts, tax amounts, and more.
Divide the part by the whole and multiply by 100. For example, 30 is what percent of 200? (30 / 200) × 100 = 15%. This is useful for test scores, completion rates, and proportions.
Subtract the old value from the new value, divide by the old value, and multiply by 100. For example, going from 50 to 75: ((75 - 50) / 50) × 100 = 50% increase. A negative result means a decrease.
Fraction Calculator
Add, subtract, multiply, and divide fractions with step-by-step solutions. Automatically simplifies results and converts between fractions and mixed numbers.
Discount Calculator
Calculate the sale price after one or two stacked discounts. See exactly how much you save and the true total percentage off.