Percentage Change Calculator
Increase, decrease and percentage-point difference.
Enter your values
Enter the original value you are working with.
Enter the new value you are working with.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- Percentage change
- +26.4%
- Direction
- Increase
- Absolute change
- 330
- Multiplier
- 1.264×
- Percentage difference
- 23.322%
Working
- 1Δ% = (1580 − 1250) ÷ 1250 × 100 = 26.4%
Quick answer
Percentage change is (new − old) ÷ old × 100; a negative result means a decrease.
Δ% = (new − old) ÷ |old| × 100
At a glance
| What it does | Increase, decrease and percentage-point difference. |
|---|---|
| Category | Math |
| Inputs needed | Original value, New value |
| Main output | Percentage change |
| Formula | Δ% = (new − old) ÷ |old| × 100 |
| Cost | Free — no sign-up, no download |
How to use the Percentage Change Calculator
- 1Enter the original value.
- 2Enter the new value.
- 3Read the change as a percentage and a multiplier.
Inputs explained
- Original value
- Enter the original value you are working with.
- New value
- Enter the new value you are working with.
Worked example
Using the values the calculator loads with:
Inputs
- Original value1250
- New value1580
Results
- Percentage change+26.4%
- DirectionIncrease
- Absolute change330
- Multiplier1.264×
- Percentage difference23.322%
- Δ% = (1580 − 1250) ÷ 1250 × 100 = 26.4%
Frequently asked questions
What's the difference between percent and percentage points?
Going from 5% to 7% is a 2 percentage-point rise but a 40% relative increase — news headlines often confuse these.
Why isn't a 50% fall reversed by a 50% rise?
Because the base changes. After a 50% drop you need a 100% rise to get back to where you started.
What do I need to enter into the Percentage Change Calculator?
Just 2 values: original value, new value. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Percentage Change Calculator work out the answer?
Percentage change is (new − old) ÷ old × 100; a negative result means a decrease. It applies the formula Δ% = (new − old) ÷ |old| × 100 and shows the working so you can check each step by hand.
Is the Percentage Change Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.