Percent of a number
Use this for discounts, tips, tax and marks. Enter the percentage and the number, and the result is the part. 20% of 150 is 30.
Percentage Calculator
Three everyday percentage questions in one place: a percent of a number, one number as a percent of another, and percent change.
Result
0
Enter both numbers to see the result.
Three percentage sums, shown step by step.
Each mode shows the working along with the answer, so you can check it or do the next one by hand.
One number as a percent of another
Use this for test scores, completion rates and shares of a total. Enter the part first and the whole second. 18 correct answers out of 24 is 75%.
Percent change
Use this to compare two values over time, such as prices, grades or traffic. Enter the old value first. A move from 200 to 150 is a 25% decrease.
Questions, answered.
Multiply the number by the percentage and divide by 100. For example, 15% of 240 is 240 x 15 / 100 = 36.
Divide the first number by the second and multiply by 100. For example, 45 out of 60 is 45 / 60 x 100 = 75%.
Subtract the old value from the new value, divide by the old value and multiply by 100. Going from 80 to 100 is (100 - 80) / 80 x 100 = 25% increase.
Use the second mode. Enter the marks you scored and the total marks available. 42 out of 50 is 84%.
Percent change divides by the starting value. Dividing by zero is undefined, so there is no meaningful percentage when the old value is zero.
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