Percentage Calculator Online
Use this free percentage calculator to find what percent of a number is, calculate percentage change between two values, or apply a percentage increase or decrease. Perfect for school, finance, shopping, and business.
How the Formula Works
% of Number: Result = (Percentage ÷ 100) × Number
% Change: Change = ((New − Old) ÷ |Old|) × 100
% Increase: Result = Original × (1 + Percentage ÷ 100)
Example: 15% of 200 = (15/100) × 200 = 30. Percentage change from 50 to 75 = ((75−50)/50) × 100 = 50% increase.
Frequently Asked Questions
How do I calculate a percentage of a number?
Multiply the number by the percentage and divide by 100. For example, 20% of 150 = (20 ÷ 100) × 150 = 30.
How do I calculate percentage change?
Subtract the original value from the new value, divide by the original value, then multiply by 100. Example: from 80 to 100 = (100−80)/80 × 100 = 25% increase.
What is the difference between percentage increase and percentage change?
Percentage change can be positive (increase) or negative (decrease). Percentage increase specifically refers to how much a value grew relative to its original.
Can I use this for tax calculations?
Yes. Enter the tax rate as the percentage and the pre-tax price as the number to find the tax amount.
Is this calculator free?
Yes, completely free with no signup required.