Percentage Calculator

Four types of percentage calculation on one page — instantly solved. Find a percentage of a number, calculate percentage change, or add and subtract percentages.

What is X% of Y?

What is % of ?

Result30

X is what % of Y?

is what % of ?

Result15%

Percentage change

From to

Increase+25%

Add / subtract a percentage

After adding 20%240

How to use the percentage calculator

What is X% of Y?

Multiply the number by the percentage and divide by 100. For example, 20% of 200 = (20 ÷ 100) × 200 = 40.

X is what % of Y?

Divide the part by the whole and multiply by 100. For example, 30 is what % of 200? (30 ÷ 200) × 100 = 15%.

↑↓

Percentage change

((New − Old) ÷ Old) × 100. A positive result is an increase; negative is a decrease. Used for price changes, salary increases, and growth rates.

+−

Add or subtract a %

Multiply the original value by (1 + rate) to add, or (1 − rate) to subtract. For example, + 15% tax = × 1.15 = .

Percentages appear everywhere — discounts, tax, interest rates, tips, test scores, and statistics. Understanding which type of calculation to use is the key skill. This calculator handles all four types instantly, updating as you type.