Find X% of a number, calculate percentage change, or find what percent one number is of another — instant results, no signup.
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Percentage Calculator
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Percentage Formula
Formula
Percentage = (Part ÷ Whole) × 100
To find X% of Y: multiply Y by X/100. Example: 15% of 200 = 0.15 × 200 = 30.
To find % change: (New − Old) ÷ Old × 100. Example: 80 to 100 = (20/80) × 100 = 25%.
To find what % A is of B: (A ÷ B) × 100. Example: 30 out of 200 = 15%.
Frequently Asked Questions
What is 15% of 200? +
15% of 200 = (15/100) × 200 = 30. Enter 15 in the percentage field and 200 in the number field, then click Calculate.
How do I calculate percentage increase? +
Use the % Change mode. Percentage increase = ((New Value − Old Value) / Old Value) × 100. For example, from 80 to 100 = ((100−80)/80) × 100 = 25% increase.
What is the percentage formula? +
Percentage = (Part ÷ Whole) × 100. For example, 30 out of 200 = (30/200) × 100 = 15%.
How do I calculate a percentage decrease? +
Same as percentage change — enter the original (higher) value first and the new (lower) value second. A negative result means a decrease.