Percentage calculator
Pick what you want to know, enter the two numbers and you get the answer right away.
It covers the four everyday percentage sums: a part, a share, an increase and a decrease.
How it's calculated
- X% of Y = X × Y ÷ 100.
- X as a percent of Y = X ÷ Y × 100.
- Y plus X% = Y × (1 + X ÷ 100). Y minus X% = Y × (1 − X ÷ 100).
An example
15% of 200 is 30.
30 is 25% of 120.
A price of BTN 4,000 going up 10% becomes BTN 4,400.
Frequently asked questions
How do I work out a percentage of a number?
Multiply the number by the percentage and divide by 100. 20% of 350 is 350 × 20 ÷ 100 = 70.
How do I find what percent one number is of another?
Divide the part by the whole and multiply by 100. If you get 45 out of 60 right, that is 45 ÷ 60 × 100 = 75%.
How do I add a percentage to a price?
Multiply it by 1 plus the percentage as a decimal. To add 10%, multiply by 1.10.
Does going up 10% and then down 10% get me back to the start?
No. 100 plus 10% is 110, and 110 minus 10% is 99. The decrease applies to a bigger number.
Key terms
- Percentage
- An amount written as parts out of 100.
- Base
- The number the percentage is taken from (Y in this calculator).
The same calculation in other countries
United States (English)
United Kingdom
Canada (English)
Ireland
Australia
New Zealand
South Africa
Singapore
India
Hong Kong SAR China
Nigeria
Malaysia
Philippines
Kenya
Tanzania
Ghana
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United Arab Emirates
Kuwait
Uganda
Jamaica
Mauritius
Cyprus (English)
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We check the official sources automatically, every day.