percentage = part ÷ whole × 100Check whether the question asks for a percentage, a change, or a difference—the reference value changes the formula.
Calculate
Percentage difference
Compare two values using their average as the reference.
LocalFree
This tool runs on your device in the browser.
Instructions and limitations
TOOL GUIDE
What this tool is for
Percentage difference — Compare two values using their average as the reference.
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.
EXPLANATION & EXAMPLE
Understand the result—not just the number
15% of 200 = 0.15 × 200 = 30After calculating, the tool shows the values used and the working so you can check it.