THE NUMBERS, EXPLAINED
How to use this calculator.
Percentage difference uses the mean of the two values as its baseline, rather than treating either value as the original. Both values must not be zero.
Start with your inputs
Enter first value, second value. Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| First value | 80 |
| Second value | 120 |
A worked example
With the example inputs above, difference (%) is 40. Change the inputs to explore your own scenario.
Putting the example numbers into the formula
Difference (%)
abs((80)-(120)) ÷ (((80)+(120)) ÷ 2) × 100 = 40
| Result | Example answer |
|---|---|
| Difference (%) | 40 |
How this is calculated
Difference (%)
abs(a-b) ÷ ((a+b) ÷ 2) × 100
Symbols and units
- a
- First value
- b
- Second value
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Calculation steps and notation
abs(x) is the magnitude of x without its sign.
Assumptions and limits
Percentage difference uses the mean of the two values as its baseline, rather than treating either value as the original. Both values must not be zero.
Calculations use the values you enter. Blank or invalid inputs show an error instead of silently substituting zero. Results are displayed to useful precision; calculations retain the underlying numeric precision.
Questions about this tool
What does the result tell me?
Difference (%). The result applies to the method and inputs described above. Check the units and assumptions before using it in a decision.
Why might another calculator differ?
Differences in units, rounding, timing or model definitions can produce different answers. Compare the input definitions and the method, rather than only the final number. For this tool: Percentage difference uses the mean of the two values as its baseline, rather than treating either value as the original. Both values must not be zero.
Are my inputs stored or sent to AI?
Calculations on this page happen in your browser. The separate AI question finder sends its submitted conversation to OpenAI; these calculator fields are not sent. Favourites and recent tool names are stored locally. A shared link contains the inputs you choose to include.
Further reading
Background reading; this does not imply endorsement or independent review of SumFizz.
Review status
Software example and browser checks are recorded in our quality report. No external expert review is claimed. Created with coding assistance; calculations run as ordinary browser code.
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