Percentage calculator
What is X% of Y · percentage increase & decrease · what percent is X of Y · instant results
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What is
X% of Y?
X% of Y?
X is what %
of Y?
of Y?
Percentage
increase
increase
Percentage
decrease
decrease
% change
from X to Y
from X to Y
Tip &
split bill
split bill
Results are calculated instantly as you type. All calculations use standard mathematical formulas. Results copy to clipboard on calculate.
Percentage reference guide
Common percentage 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
Result = ((New - Old) ÷ Old) × 100
e.g. 80 to 100 = +25% increase
Quick percentage reference
%of $100of $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%
Good — excellent service18–20%
Exceptional service25%+
Bar / coffee (per drink)$1–2 per drink
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