FORMULA
Measure growth relative to the starting value, not simply the size of the difference.
STEP BY STEP
Use the formula in three steps
- 1
Subtract the old value from the new value.
- 2
Divide the increase by the old value.
- 3
Multiply by 100 to express the change as a percentage.
WORKED EXAMPLES
Check the calculation
((100 − 80) ÷ 80) × 10025% increase((300 − 240) ÷ 240) × 10025% increaseACCURACY NOTE
Round at the end
The starting value cannot be zero because percentage change is measured relative to that starting value.
FAQ
Common questions about this calculation
Which value is the baseline?
The old or starting value is the baseline, so it belongs in the denominator.
What does a negative result mean?
A negative percentage change means the new value is lower than the starting value.
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