Percentage Calculator
Calculate percentages, shares, increases, discounts and percentage change with live results and formulas.
Percentage of a number
200 × 15% = 30
Enter both values to see the result.
Basic Percentage Calculation
30 ÷ 200 × 100 = 15%
Enter both values to see the result.
Find the whole
30 ÷ (20 ÷ 100) = 150
Enter both values to see the result.
Percentage Increase/Decrease
200 × (1 − 15 ÷ 100) = 170
Enter both values to see the result.
Percentage Change
(100 − 80) ÷ 80 × 100 = 25%
Enter both values to see the result.
How to Use
Choose one of the five calculations, or load its example. Enter two numbers; the result and formula update as you type. For an adjustment, choose increase or decrease. Results are rounded to two decimal places.
Frequently Asked Questions
Features
Calculate a part as a percentage of a total, percentage increases or decreases, and change between two values.
Check which value is the starting amount. Percentage change depends on that denominator and is undefined when the starting value is zero.
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