percentage calculator

What is X% of Y · X is what % of Y · percentage increase & decrease · tip calculator

What is
X% of Y?

X is what %
of Y?

Percentage
increase

Percentage
decrease

% change
from X to Y

Tip &
split bill

Percentage (%)

Of what number

Results calculate instantly as you type. All calculations use standard mathematical formulas. Result copies to clipboard automatically.

Percentage reference

Common formulas

What is X% of Y?

Result = (X ÷ 100) × Y

e.g. 15% of 200 = 30

X is what % of Y?

Result = (X ÷ Y) × 100

e.g. 30 is 15% of 200

Percentage increase

Result = Original × (1 + %÷100)

e.g. 100 + 25% = 125

Percentage decrease

Result = Original × (1 − %÷100)

e.g. 100 − 20% = 80

Percentage change

((New − Old) ÷ Old) × 100

e.g. 80 to 100 = +25%

Quick reference table

% of $100 of $1,000

5%$5.00$50.00

10%$10.00$100.00

15%$15.00$150.00

20%$20.00$200.00

25%$25.00$250.00

50%$50.00$500.00

75%$75.00$750.00

Tip guide — Canada & USA

Minimum — poor service10%

Standard — good service15%

Excellent service18–20%

Exceptional service25%+

Bar / coffee per drink$1–2

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