Free • No login required

Percentage Calculator

Calculate percentages in 4 modes: find what percent X is of Y, find X% of Y, calculate percent increase, or percent decrease between two values.

Calculation Mode

Value X

Value Y

Fill in the fields above and click Calculate to see your results.

How to use

Calculate percentages in 4 modes: find what percent X is of Y, find X% of Y, calculate percent increase, or percent decrease between two values.

How it's calculated

X is what % of Y

value_x / value_y * 100

What percentage is X of Y

X% of Y

value_x / 100 * value_y

X percent of Y

% Increase from X to Y

(value_y - value_x) / value_x * 100

Percentage increase from X to Y

% Decrease from X to Y

(value_x - value_y) / value_x * 100

Percentage decrease from X to Y

Result

(mode == 1) * result_mode1 + (mode == 2) * result_mode2 + (mode == 3) * result_mode3 + (mode == 4) * result_mode4

Result for the selected mode

Examples

25% of 200 = 50

Calculation Mode:2
Value X:25
Value Y:200

50 is what % of 200 = 25%

Calculation Mode:1
Value X:50
Value Y:200

Frequently Asked Questions

How do I find what percent X is of Y?

Select mode 1 (X is what % of Y), enter X and Y. The formula is (X ÷ Y) × 100. For example, 50 is 25% of 200 because (50 ÷ 200) × 100 = 25.

How do I calculate X% of Y?

Select mode 2 (X% of Y), enter the percentage as X and the base value as Y. The formula is (X ÷ 100) × Y. For example, 25% of 200 = (25 ÷ 100) × 200 = 50.

How do I calculate percent increase or decrease?

For percent increase (mode 3), enter the original value as X and the new value as Y: formula is (Y − X) ÷ X × 100. For percent decrease (mode 4), enter the original as X and new as Y: formula is (X − Y) ÷ X × 100.