# Online Percentage Calculator

Do you find yourself in a position when you simply forget how to calculate a percentage? Even on a calculator? Percentage calculator is a tool to calculate and covert percentages. Are you on the go and need fast and simple calculations? If so, this online percentage calculator is for you and is absolutely free to use by anyone on mobile, tablet and desktop devices.

This tool supports 2 functionalities:

1. You can calculate the value of a percentage of a specific number (e.g. What is 25% of 100)

2. Enter 2 numbers to calculate the percentage (e.g. 250 is what percent of 500)

## Common Percentage Calculations Questions

**Q:**How to calculate the value of a percentage?

**A:** This is the most common percentage calculation that we see on the daily basis. This percentage calculation is particularly useful for finding mortgage & loan interest amounts. For example, let’s say you need to calculate 15% of 400.

**Step 1:** Multiply 15 by 0.01 = 0.15

**Step 2:** Multiply 0.15 by 400 = 60 (15% of 400 = 50)

**Q:**How to calculate a discount percentage?

**A:** Although most online shops and store would display the actual discounted price, it may still be useful for you to know how to find out a discounted price. For example, let’s assume that you are buying a bag for $50 which is on 30% OFF.

**Step 1:** Take the opposite discount percentage (in this case it will be 70%)

**Step 2:** Multiply 70 by 0.01 = 0.7

**Step 3:** Multiply 0.7 by $50 (the original price) = $35

**Q:**How to calculate the percentage increase?

**A:** To work out the percentage increase you would need to work out the difference first. For example, let’s take 400 as the initial number, which has increased to 450. So, the increase difference is 50 (450 – 400).

**Step 1:** Now that we know the difference (50), let’s divide 50 by 400 (the original number) = 0.125

**Step 2:** Now multiply 0.125 by 100 = 12.5%

**Step 3:** The increase of 50 = 12.5%

Use the same method to calculate percentage decrease.

**Q:**What percentage of population have internet access?

**A:**Over 45 Percent (%) of population have internet access, which is over 3.5 billion people.

**Q:**What country has the highest income tax?

**A:**Belgium, where income tax can be as high as 64 Percent (%).

**Q:**How to convert percentage to a decimal?

**A:**To change/convert percentage to a decimal, divide a percentage by 100. For example, 40% ÷ 100 = 0.4.

**Q:**How to convert decimal to a percentage?

**A:**To change/convert decimal to a percentage, multiply decimal by 100. For example, 0.4 x 100 = 40%.

**Q:**How to add a percentage to a number?

**A:**As an example, let’s add 55% to 10,000 using this technique. First of all, you need to convert percentage to a decimal by dividing the percentage by 100 (e.g. 55% ÷ 100 = 0.55).

**Step 1:** Add 1 to the decimal. For example, 1 + 0.55 = 1.55

**Step 2:** Multiply the original number by 1.55. 10,000 x 1.55 = 15,500

**Step 3:** The result is 15,500.

**Q:**How to subtract percentage from a number?

**A:**This calculation is very similar to adding a percentage, but instead, we need to subtract decimal from 1. As an example, let’s subtract 55% from 10,000 using this technique. First of all, you need to convert percentage to a decimal by dividing the percentage by 100 (e.g. 55% ÷ 100 = 0.55).

**Step 1:** Subtract 0.55 from 1 (i.e. 1 – 0.55 = 0.45)

**Step 2:** Multiply the original number by 0.45. 10,000 x 0.45 = 4,500.

**Step 3:** The result of subtracting 55% of 10,000 is 4,500.

**Q:**What percent of food is wasted or thrown away?

**A:**According to the Guardian, Between 30% – 50% of all the food is wasted or thrown away.

**Q:**What percentage of water does the human body contain?

**A:**The average human body is made of 60% – 70% of water.

**Q:**How to work out 25 percent (%) of a number?

**A:**First of all, let’s convert 25% to a decimal, divide 25% by 100 (25 ÷ 100 = 0.25). Then, multiply the number (for example 500) by 0.25 (500 x 0.25 = 125). Hence, 25% out of 500 = 125

### Common Percent to Decimal Conversion Table?

*Remember:* To convert percentage to a decimal, divide the percentage by 100.

Percent | Decimal |
---|---|

0.5% | 0.005 |

1% | 0.01 |

2% | 0.02 |

5% | 0.05 |

10% | 0.1 |

20% | 0.2 |

25% | 0.25 |

35% | 0.35 |

50% | 0.5 |

75% | 0.75 |

100% | 1 |

200% | 2 |