Percentage Increase Calculator
Work out how much something has grown in percent, add a percentage to a number, or find the original value before an increase. Answers appear as you type.
- Instant results
- Step-by-step working
- Excel formula
- No sign-up
Percentage change
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Increase a number by a percentage
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Original value before an increase
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X is what percent of Y
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What is a percentage increase?
A percentage increase describes how much a value has grown relative to where it started. If a price rises from $80 to $100, it has increased by $20, which is 25% of the original $80. Percentage increase is used for price rises, salary raises, population growth, website traffic and investment returns, because it makes changes of different sizes comparable.
How to use Percentage Increase Calculator
- To measure an increase, enter the old value and the new value in “Percentage change”.
- To add a percentage, enter the number and the percentage in “Increase a number by a percentage”.
- To undo an increase, enter the final value and the percentage in “Original value before an increase”.
- Open “Show working” to see the steps and copy an Excel or Google Sheets formula.
Percentage increase formulas
- Increase % = (New − Old) ÷ Old × 100
- $80 → $100: (100 − 80) ÷ 80 × 100 = 25%.
- New = Old × (1 + Percentage ÷ 100)
- $2,500 increased by 4% = 2,500 × 1.04 = $2,600.
- Old = New ÷ (1 + Percentage ÷ 100)
- $120 including 20% VAT = 120 ÷ 1.2 = $100 before VAT.
- A 50% increase then a 50% decrease is not zero
- 100 → 150 → 75. Percentages apply to different starting values.
Why use this percentage increase calculator
- Answers as you typeNo Calculate button and no page reloads. Change any number and the result updates instantly.
- Shows the workingEvery answer comes with the steps and a plain-English sentence, so you can check it or copy it into homework and reports.
- Spreadsheet formula includedCopy the matching Excel or Google Sheets formula and reuse the calculation on a whole column.
- Private and ad-free workspaceNumbers are calculated on your device. Nothing you type is sent anywhere.
Common uses
- Pay rises. See what a 4% raise does to a salary, or what percent your new pay is above the old.
- Prices and inflation. Compare this year’s price with last year’s.
- Business growth. Report month-over-month revenue, users or traffic growth.
- Pre-tax prices. Remove VAT or sales tax from a total with the reverse calculation.
Need a different calculation? Try the percentage calculator, discount calculator or percentage change calculator, or generate numbers with the random number generator.
Example: removing 20% VAT
A receipt shows £96 including 20% VAT. In “Original value before an increase”, enter 96 and 20. The price before VAT was £80, and the VAT itself was £16. Subtracting 20% of £96 (£19.20) would be wrong, because VAT was added to £80, not £96.
What to expect from the result
An increase from 0 cannot be expressed as a percentage. For growth over several periods, such as yearly returns, use a compound annual growth rate (CAGR) rather than a single percentage increase.
Percentage Increase Calculator questions
How do you calculate percentage increase?
Subtract the original value from the new value, divide by the original value, and multiply by 100. From 80 to 100: (100 − 80) ÷ 80 × 100 = 25%.
How do I increase a number by a percentage?
Multiply the number by 1 plus the percentage as a decimal. To add 12% to 250: 250 × 1.12 = 280.
How do I find the original number before a percentage increase?
Divide the final number by 1 plus the percentage as a decimal. 280 after a 12% increase: 280 ÷ 1.12 = 250.
Can a percentage increase be more than 100%?
Yes. Doubling is a 100% increase and tripling is a 200% increase. From 50 to 175 is a 250% increase.
What is the percentage increase formula in Excel?
Use =(New-Old)/Old and format the cell as a percentage, for example =(B2-A2)/A2. Open “Show working” under a result to copy the formula with your numbers.