How do I calculate a percentage of a number?

To find X% of Y, multiply Y by X and divide by 100. For example, 25% of 200 = 200 × 25 ÷ 100 = 50.

How do I calculate percentage change?

Percentage change = ((New Value - Old Value) / Old Value) × 100. A positive result means increase, negative means decrease.

Unit Converters

Calculate percentages, percent change, increase, and decrease. Multiple calculation modes for all your percentage needs.

What is X% of Y?

of Value

Result

50.00

(25 ÷ 100) × 200

25% of 200 is 50

50% of 100

= 50

25 is ?% of 100

= 25%

100 → 150

= +50%

200 + 10%

= 220

Finding a percentage of a number

Multiply the number by the percentage and divide by 100. Example: 25% of 200 = (200 × 25) ÷ 100 = 50

Finding what percent one number is of another

Divide the part by the whole and multiply by 100. Example: 50 is what % of 200? = (50 ÷ 200) × 100 = 25%

Calculating percentage change

Subtract the old value from the new, divide by the old value, and multiply by 100. Example: 100 to 150 = ((150-100) ÷ 100) × 100 = 50%

Convert between different units of measurement. Supports length, weight, temperature, volume, area, speed, time, and data.