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Percentage calculator

Find X% of a number, what percent a part is of a whole, percentage change, discounts, markups, and the original price before a discount.

What is X% of a number

part
What is% of?

300

1,500 × 20 ÷ 100 = 300

What percent a number is of a total

share
What percent isof?

85%

34 ÷ 40 × 100 = 85%

Percentage change

increase / decrease
Fromto

+25%

(100 - 80) ÷ 80 × 100

Up 20.

Add a percentage

markup
Increaseby%

1,380

1,200 × 1.15 = 1,380

The markup is 180.

Subtract a percentage

discount
Decreaseby%

1,020

1,200 × 0.85 = 1,020

You save 180.

Original price before a discount

reverse
Priceafter a% discount

1,000

800 ÷ 0.8 = 1,000

The discount was 200.

Decimal places in the result

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Guide

How to calculate percentages

A percent is one hundredth of a whole. Most calculations come down to one of three basic rules.

Part of a whole

Part = whole × percent ÷ 100. Twenty percent of CZK 1,500 is 1,500 × 20 ÷ 100 = CZK 300.

What percent

Percent = part ÷ whole × 100. If you answer 34 out of 40 questions correctly, you score 85%.

Percentage change

Change = (new - original) ÷ original × 100. A price that goes from CZK 80 to CZK 100 is up 25%. From CZK 100 to CZK 80, it's down 20%.

Watch out when working backward

If a price after a 20% discount is CZK 800, the original price isn't CZK 960. It's 800 ÷ 0.8 = CZK 1,000. The discount is taken off the original price.

FAQ

Percentages done fast and right.

Didn't find your question? Call us and get an answer right away.

Multiply the amount by 0.15. For CZK 2,000, that's CZK 300.

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