Percentage calculator: increases and decreases
Find a percentage of an amount and calculate percentage increases or decreases. Enter your starting figure and percentage for a clear, instant breakdown.
Enter your figures
Percentage value
Inputs changed. Select Calculate result to update your estimate.
Shows the percentage value, the starting amount plus that value, and the starting amount minus that value.
How the percentage calculator: increases and decreases works
Percentage value = amount × percentage ÷ 100. Increase or decrease = starting amount ± percentage value.
Data basis: mathematical formula using your inputs. Example prices and rates are illustrative, not current market quotes.
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Worked example: percentage calculator
This illustration uses the calculator’s example inputs. It is not a quote or a recommended financial decision.
- Starting amount (£)
- 120
- Percentage (%)
- 20
Percentage value: £24.00
Percentage value = amount × percentage ÷ 100. Increase or decrease = starting amount ± percentage value.
Percentage calculator: questions answered
Is a percentage decrease reversed by the same percentage increase?
Usually not. A decrease changes the base amount. A 20% reduction from £100 gives £80, and increasing £80 by 20% gives £96 rather than £100.
Using your result
Example inputs are a starting point. Replace them with your figures and select Calculate result. Results are rounded for display; calculations use unrounded values.
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