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Percentage change

Measure the percentage increase or decrease between two values.

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Instructions and limitations
TOOL GUIDE

What this tool is for

Percentage change — Measure the percentage increase or decrease between two values.

Useful for quick everyday estimates and for checking arithmetic with clearly entered values.

Common uses
  • Check everyday arithmetic
  • Compare possible values
  • Create a quick estimate
Educational and informational use

Results are general estimates, not legal, financial, tax, medical, engineering, or other professional advice. Check inputs and units and consult a qualified professional for important decisions.

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EXPLANATION & EXAMPLE

Understand the result—not just the number

Core ideapercentage = part ÷ whole × 100

Check whether the question asks for a percentage, a change, or a difference—the reference value changes the formula.

Quick example15% of 200 = 0.15 × 200 = 30

After calculating, the tool shows the values used and the working so you can check it.

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Learn the method, step by step — in a new tab

How to calculate percentage increase or decrease

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