Math calculator

Percentage Increase Calculator

Find percent increase, decrease, or difference between two numbers.

Quick answer

How do you calculate percentage increase?

Subtract the old value from the new value, divide by the old value, and multiply by 100. From 50 to 75: (75 − 50) ÷ 50 × 100 = 50% increase. A negative result means a percent decrease.

Percent change = (new − old) ÷ |old| × 100. Percent difference = |a − b| ÷ ((a + b) ÷ 2) × 100. New value = old × (1 + percent ÷ 100).

Percentage Increase / Decrease Calculator

⚡ Answer updates as you type · Enter = calculate · Esc = reset

Answer
50% increase • Change: 25
  1. Subtract: 75 − 50 = 25
  2. Divide by the starting value: 25 ÷ 50 = 0.5
  3. Multiply by 100: 50% → increase

Find the percent increase or decrease between two numbers, the percentage difference, or a new value after a percent change — with steps.

About this Percentage Increase Calculator

The Percentage Increase Calculator shows how much a number went up or down in percent — for prices, grades, salaries, populations, or test scores. It also finds the percentage difference between two values and the new value after a percent change, with every step shown.

What you'll need

  • • Mode: % increase/decrease, % difference, or increase/decrease by %
  • • Old value and new value (or two values to compare)
  • • Percent change when applying a change to a number

How it works

  1. 1. Choose what you want to find.
  2. 2. Enter the starting value and the new value (or the percent).
  3. 3. Subtract to find the change.
  4. 4. Divide by the starting value and multiply by 100.
  5. 5. Read whether it is an increase or decrease, plus every step.

Worked example

A price goes from $80 to $60: (60 − 80) ÷ 80 × 100 = −25%, a 25% decrease. The percentage difference between 10 and 20 is 10 ÷ 15 × 100 = 66.67%. $200 increased by 15% is 200 × 1.15 = $230.

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Percentage Increase Calculator FAQ

What is the Percentage Increase Calculator?

The Percentage Increase Calculator is a free online tool that helps you find percent increase, decrease, or difference between two numbers.

How do I use the Percentage Increase Calculator?

Open the Percentage Increase Calculator, enter the requested values, and review the instant estimate on the page.

Is the Percentage Increase Calculator free?

Yes. The Percentage Increase Calculator is free to use on Fast Online Calculator and does not require an account.

What is the difference between percent change and percent difference?

Percent change compares a new value to an original one, so direction matters. Percent difference compares two values with no starting point by dividing by their average.

How do you calculate percentage decrease?

Subtract the new value from the old value, divide by the old value, and multiply by 100. From 80 to 60: 20 ÷ 80 × 100 = 25% decrease.

Can a percentage increase be more than 100%?

Yes. Going from 20 to 60 is a 200% increase because the value grew by twice its original amount.

Why can't the starting value be 0?

Percent change divides by the starting value, and dividing by zero is undefined, so any growth from 0 has no percentage.

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