Work out X% of a number, what percent one number is of another, percentage increase or decrease, and discounts — all on one page with the formula shown.
360
X ÷ 100 × Y
75%
X ÷ Y × 100
+25% increase
(new − old) ÷ old × 100
2,399.2 (you save 599.8)
price × (1 − X ÷ 100)
560
value × (1 + X ÷ 100)
Percentage change = (new − old) ÷ old × 100. A rise from 80 to 100 is a 25% increase.
Divide X by Y and multiply by 100. For example, 45 of 60 is 45 ÷ 60 × 100 = 75%.