Chapimaster - Percentage Calculator - Calculate Percentages Online Quickly

Advanced Percentage Calculator

Choose the specific calculation method you need below.

1. Find Percentage of a Value V × (P/100)

Example: What is 15% of 200?

What is % of

Result:

2. Find Percentage (Part to Whole) (V1/V2) × 100

Example: 40 is what % of 200?

is what % of

Result:

3. Percentage Increase / Decrease ((V2-V1)/V1) × 100

Example: Change from 100 to 120?

From to

Result:

4. Simple Reverse Percentage V / (P/100)

Example: 50 is 20% of what total?

is % of ?

Total Value:

Calculating percentages doesn't always require a calculator. Here are three professional methods:

1. The "10% Rule" (Easiest)

To find 10% of any number, just move the decimal point one place to the left.
Example: 10% of 450 is 45. To find 20%, just double that (90)!

2. The Commutative Trick (Mind Blowing)

$x\%$ of $y$ is the same as $y\%$ of $x$.
Example: Finding 8% of 50 is hard. But finding 50% of 8 is easy (It's 4). The answer is the same!