Percent Change Calculator — % Increase Formula
Free percent change calculator and formula: ((new − old) / old) × 100. Enter old and new values for % increase or decrease — instant result.
Inputs
Percent change (%)
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Frequently asked questions
- What is the percent change formula?
- change% = ((new − old) / old) × 100. Positive means increase; negative means decrease.
- Why can old value not be zero?
- Dividing by zero is undefined. Pick a non-zero baseline, or use a different comparison (e.g. absolute difference).
- Is percent change the same as percentage difference?
- No. Percent change is relative to the old value only. Percentage difference usually divides by the average of both values.
- How do I read a −25% result?
- The new value is 25% below the old value (a decrease of one quarter).