Math

PercentageCalculator

Calculate percentages, percent change, increase/decrease instantly. Perfect for everyday calculations.

Calculation Inputs

Percentage (%)

Of Number

Calculated Value

10.00

10% of 100 is 10.00

Pro Tip

To find markup easily, use the Reverse mode. If you want a 30% margin on cost, divide cost by 0.7.

Common Percentage Formulas

Percentage of a Value

(Percentage / 100) × Value

Example: 20% of 500 = 100

Value is what % of Total

(Value / Total) × 100

Example: 50 is 25% of 200

Percentage Change

((New - Old) / Old) × 100

Example: 100 to 150 = +50%

Quick Percentage Tips

10%Divide by 10

25%Divide by 4

50%Divide by 2

5%Find 10%, then half