Percentage Increase Calculator

The Calculate menu is already set to Increase Y by X%, which is the job of this page. You only fill in two boxes.

1. Enter the rate in Percent to add (X). It begins at 15.
2. Enter the amount you are raising in Starting number (Y). It begins at 200.
3. Read the large result, which names both inputs and shows the new total. With the starting values it is 230, and the line under it says that this adds 30.
4. Read the formula line, which prints your numbers into the sum: 200 x (1 + 15.00 / 100) = 230.
5. To measure how much a number has already grown, change Calculate to Percentage change from X to Y.

A warning about the last step: the two boxes keep their names when you switch. In that mode the first box holds the old value and the second holds the new value, so replace both starting numbers before reading the answer.

To add a percent, convert it to a multiplier: one plus the rate divided by 100. A 15 percent rise is 1.15, so 200 x 1.15 = 230. Doing it in one step is quicker and less error-prone than working out the percent first and adding it afterwards.

The tool shows up to four decimal places and does not round to cents, so round a money result yourself. If a price already includes tax and you need the amount before tax, a VAT and sales tax calculator handles both directions.

Decimals in the rate work too. A monthly subscription of 12 that rises by 7.5 percent becomes 12.9, which adds 0.9. A quick sanity check helps when you type fast: with a positive rate the answer must be larger than the starting number, and if it is smaller, a minus sign or a swapped box is the likely cause. As a rough guide, a 10 percent rise is the starting number plus one tenth of it, so 200 becomes 220 before you even touch the keyboard.

Percent increases compound. Two rises of 10 percent do not make 20 percent. Starting at 100, the first rise gives 110 and the second gives 121, a total increase of 21 percent. Each rise is applied to a bigger number.

You can follow a run of yearly raises by feeding each answer back in as the next starting number. Take a pay of 48,000 and three raises of 3 percent:

• Year one: 48,000 becomes 49,440.
• Year two: 49,440 becomes 50,923.2.
• Year three: 50,923.2 becomes 52,450.896, or about 52,451.

That is an overall rise of 9.27 percent, not 9. The extra 0.27 comes from raises being paid on earlier raises. The same compounding works against you on prices, which is why a few small rises in a row can feel larger than the headline rate. For the reverse direction, a cut applied to the same number, use the percentage decrease calculator.

It adds one rate to one number, nothing more. It does not know about inflation, tax rules or contract terms, and a negative rate simply behaves as a decrease. Entering 0 returns the starting number unchanged.

Increase is not the same as profit margin. Adding 25 percent to a cost of 60 gives a selling price of 75, but your margin on that price is 20 percent, not 25. The profit margin calculator separates markup from margin. If you know the before and after figures and want the rate, the percent change calculator works that out directly, and turning a yearly figure into hourly pay is the job of the salary to hourly calculator.

Results are arithmetic for general information, not financial advice. Everything runs on your device.