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Percentage Calculator

Use this tool to calculate percentages, percentage change, and percentage increase.

What is % of ?

Frequently Asked Questions

How do I calculate a percentage of a number?
To calculate a percentage of a number, multiply the number by the percentage (as a decimal). For example, to find 20% of 150: 150 × 0.20 = 30. The formula is: (Percentage ÷ 100) × Number = Result.
What's the difference between percentage and percentage change?
Percentage calculates a portion of a whole number (e.g., 20% of 100 = 20). Percentage change measures the relative difference between two values (e.g., from 50 to 100 is a 100% increase). Percentage change = [(New Value - Old Value) ÷ Old Value] × 100.
How do I calculate percentage increase or decrease?
Use the formula: [(New Value - Old Value) ÷ Old Value] × 100. If the result is positive, it's an increase; if negative, it's a decrease. For example, from 80 to 100: [(100-80)÷80]×100 = 25% increase.
Can I use this calculator for discount calculations?
Yes! Use the "Percentage" tab to calculate discounts. For example, to find a 15% discount on a $200 item: Enter 15 in the percentage field and 200 in the number field. The result ($30) is your discount amount, and the sale price would be $170.
How accurate are the percentage calculations?
Our calculator provides highly accurate results with up to 10 decimal places precision. For practical use, results are typically displayed with 2 decimal places. The calculations follow standard mathematical formulas and handle both very small and very large numbers effectively.

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