Mastering Percentages: A Complete Guide
Percentages are everywhere — from calculating tips and discounts to understanding interest rates and statistics. This guide covers everything you need to know...
Percentage Calculator
Calculate percentages, increases, decreases, and more
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Formula
Formula
Various: X% of Y = X/100 × Y; X is what % of Y = X/Y × 100; % Increase = (New - Old)/Old × 100
Each tab uses a different percentage formula. The calculator automatically applies the correct formula based on your selection.
How to Calculate Manually
- 1 Select the type of percentage calculation you need
- 2 Enter the two values required for your calculation
- 3 The result updates instantly as you type
- 4 Use the formula reference below to understand the math
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Reference Table
| Calculation Type | Formula | Example |
|---|---|---|
| X% of Y | X/100 × Y | 20% of 150 = 30 |
| X is what % of Y | X/Y × 100 | 30 is what % of 150 = 20% |
| % Increase | (New - Old)/Old × 100 | 100 to 120 = 20% |
| % Decrease | (Old - New)/Old × 100 | 120 to 100 = 16.67% |
| Original from % | X / (1 + %/100) | 120 is 20% more than 100 |
Frequently Asked Questions
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How do I calculate a percentage?
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How do I calculate percentage increase?
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What's the difference between percentage points and percent?
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