Percentage calculator
Work out a percentage of a number, percent change, increases and discounts, stacked discounts and the original price before a markup or sale.
Verified October 21, 2026Parameters in effect since January 1, 2026ISO 80000-1:2022 (yüzde tanımı); parametre yok
Result
18% of 2,500 is 450.
- Value
- 450
General information, not financial or investment advice.
FAQ
How do I find a percent of a number?
Multiply the number by the percent as a decimal: 18% of 2,500 is 2,500 × 0.18 = 450.
How is percent change calculated?
Subtract the old value from the new one and divide by the old value: going from 80 to 100 is (100 − 80) ÷ 80 = a 25% increase.
Why aren't 20% and 10% off the same as 30% off?
The second discount applies to the already reduced price: 1,000 × 0.80 × 0.90 = 720, which is 28% off in total.
How do I find the price before a markup?
Divide the final amount by (1 + the percent): 118 after an 18% increase was 118 ÷ 1.18 = 100.
What's the difference between percent and percentage points?
Going from 10% to 12% is a 2 percentage point increase but a 20% increase in relative terms. Percentage points are the plain difference between two rates.