Percentage Calculator
By Hesaplayıcı
The percentage calculator finds a percentage of a number, what percent one number is of another (30 is 25% of 120), and a price after a discount or an increase. Enter the number and the percentage; the part is number × percentage ÷ 100. Use it for prices, raises, discounts and test scores.
Worked example: 20% of 1,000
Result
200
- After increase
- 1,200
- After discount
- 800
Step by step
Result
part = amount × percent / 100
part = 1,000 × 20 / 100 = 200
How to use
- Under What to calculate, choose your question: a percentage of a number, A is what percent of B, a price after a discount or a price after an increase.
- For a percentage of a number, fill in the Number (B) and the Percentage; for 20%, type 20.
- For the what-percent question, fill in the Part (A) and the Number (B).
- For a price after a discount or an increase, type the old price as the Number (B) and the discount or increase rate as the Percentage.
- Press Calculate. For the first two questions you get the result and the values after the increase and after the discount. For a discount you get the new price and the saving; for an increase, the new price.
Formula
- A percentage of a number:
part = amount × percent / 100 - A is what percent of B:
percent = A / B × 100 - Price after a discount:
new price = price − price × percent / 100 - Price after an increase:
new price = price + price × percent / 100
The value after an increase is amount + part, and the value after a discount is amount − part. In the what-percent question, the part is A. For example, a 30% discount on 1,250 saves 1,250 × 30 / 100 = 375, so the new price is 1,250 − 375 = 875.
Worked example
The worked example on this page runs the calculator’s first example with the formula step. When you calculate with your own values, the same step appears in the result.
Limits
The calculator does not calculate the percentage change between two numbers; the percentage change calculator does that. In the what-percent question, B cannot be zero. Negative numbers and percentages above 100% are allowed.
Frequently Asked Questions
What is a percentage?
A percentage is a number expressed as a fraction of 100 and written with the % sign. For example, 25% means twenty-five hundredths, or one quarter.
How do you calculate a percentage of a number?
Multiply the number by the percentage and divide by 100. For example, 20% of 50 is (50 × 20) ÷ 100 = 10.
How do you calculate a percentage increase or discount?
First find the part. For an increase, add it to the number; for a discount, subtract it. For example, a 15% discount on 200 is 200 × 15 ÷ 100 = 30, so the result is 200 − 30 = 170. In the calculator, choose “Price after a discount” or “Price after an increase” under What to calculate.
How do you find what percent one number is of another?
Divide the first number by the second and multiply by 100. For example, 30 is 30 ÷ 120 × 100 = 25% of 120. In the calculator, choose “A is what percent of B?” under Calculate.
Calculation rules
- A percentage of a number: result = number × percentage / 100.
- A is what percent of B: result = A / B × 100. When A is larger than B the result is above 100%; B cannot be zero.
- The values after an increase and a discount are the number raised and lowered by that percentage.
- Price after a discount: saving = price × percentage / 100, result = price − saving. Price after an increase: result = price + price × percentage / 100. Enter the price as the Number (B) and the discount or increase rate as the Percentage.