Percentage Increase Calculator
Add a percentage to any number and see the new value and exactly how much was added.
Percentage Increase Calculator calculates in your browser.
Add a percentage to a number
Use this when you know where a value starts and the percentage it should grow by — a price going up 8%, a budget growing 12.5%, a batch of cookies scaled up by half. The calculator shows the new value and the amount added side by side, so you see both the result and the size of the increase. If you already have the before and after numbers and want the percentage between them, the Percentage Change Calculator is the one to use.
How to use the Percentage Increase Calculator
- Type the starting value.
- Type the percentage to increase it by.
- Read the new value and the increase amount, with the working underneath. Copy Result copies a line such as “200 increased by 15% = 230 (an increase of 30)”.
The formula
increase = starting value × percentage ÷ 100
new value = starting value + increase
shortcut: new value = starting value × (1 + percentage ÷ 100)
The one-step multiplier is handy when increases repeat. Two 10% increases multiply the value by 1.1 twice — 1.1 × 1.1 = 1.21 — which is a 21% increase overall, not 20%, because the second 10% is taken of a larger number. The same idea explains why a 100% increase doubles a value (× 2) and a 150% increase multiplies it by 2.5.
| Increase | Amount added | New value |
|---|---|---|
| 200 + 15% | 30 | 230 |
| 80 + 2.5% | 2 | 82 |
| 49.99 + 7.5% | 3.74925 | 53.73925 |
| 200 + 150% | 300 | 500 |
| 1,250 + 0% | 0 | 1,250 |
Calculated on your device
- The calculation runs in your browser as you type; nothing is sent to a server.
- The values, percentages, and results are not sent to Looty Tools or stored.
- Refreshing the page clears the boxes.
Limitations
- The starting value and the percentage must both be 0 or more. To take a percentage off, use the Percentage Decrease Calculator.
- One increase at a time. For repeated increases, enter each new value as the next starting value.
- Results are not rounded to cents or any fixed number of places — they show up to 10 decimal places with trailing zeros removed. For prices, round to the cent yourself.
- Values can be up to 1,000,000,000,000,000 with up to 10 decimal places; use a period for decimals.
Related calculators
- Percentage CalculatorFind a percentage of a number.
- Percentage Change CalculatorMeasure the percent change between two numbers.
- Discount CalculatorFind the sale price after a percent off.
Guides
- Increase by a PercentageAdd a percentage to a number in two steps or one, with a multiplier table, how chained increases compound, and ways to check the answer.
- Increase vs. ChangeAdding a known percentage to a value and measuring how much a value grew are different calculations. How to tell them apart and which to use.
- Pay, Prices, and MarkupWorked percentage increases for pay rises, price rises, and scaled recipes, why markup and margin differ, and how to undo an increase.
Percentage Increase Calculator FAQ
- How do you increase a number by a percentage?
- Work out that percentage of the number and add it on: 15% of 200 is 30, so the new value is 230. In one step, multiply by 1 plus the percentage divided by 100: 200 × 1.15 = 230.
- How is this different from the Percentage Change Calculator?
- This calculator starts from one value and a percentage and gives you the new value. The Percentage Change Calculator starts from two values — before and after — and tells you the percentage between them.
- Can I increase by more than 100%?
- Yes. A 100% increase doubles the value, and a 150% increase on 200 adds 300, giving 500 — two and a half times the original.
- Are two 10% increases the same as one 20% increase?
- No. Increasing 200 by 10% gives 220, and increasing 220 by another 10% gives 242 — not 240 — because the second increase is taken of the larger number. To chain increases, enter each new value as the next starting value.
- Why can’t I enter a negative value or percentage?
- This calculator is for adding a percentage to a value of 0 or more. A negative percentage would really be a decrease, so the box points you to the Percentage Decrease Calculator instead.
- How are the results rounded?
- They aren’t rounded to a fixed number of places. Results show up to 10 decimal places with meaningless trailing zeros removed, so 7.5% of 49.99 shows as 3.74925 rather than 3.75.
- Are the numbers I enter sent anywhere?
- No. The calculation runs in your browser as you type. The numbers you enter and the results are not sent to Looty Tools or stored; refreshing the page clears them.
