Percentage Calculator
Calculate percentages instantly — 6 different calculation types
What is X% of Y?
What is
% of
?
30
15% of 200 = 30
X is what % of Y?
is what % of
?
15%
30 is 15% of 200
Percentage change (increase / decrease)
From
to
+25%
80 → 100 = +25% increase
Add or subtract a percentage
%
600
500 + 20% = 600
Find original value (reverse percentage)
is
% of what?
300
75 is 25% of 300
Percentage Formulas Explained
- X% of Y = Y × (X / 100)
- X is what % of Y = (X / Y) × 100
- Percentage change = ((new − old) / |old|) × 100
- Add/subtract % = value × (1 ± percent/100)
- Find original = result / (percent / 100)
Common Uses
- Calculate discounts: "20% off $150" → 150 − 20% = $120
- Calculate tips: "15% tip on $85" → 15% of 85 = $12.75
- Growth rate: sales went from 800 to 1000 → +25% increase
- Tax: price $200 + 8% tax → 200 + 8% = $216
- Grade: got 42 out of 55 → 42 is what % of 55 = 76.4%