How to Calculate Percentages: The Complete Guide
Master every kind of percentage problem — finding a percentage of a number, percentage change, increases and decreases, working backwards, and the traps that catch people out — with clear examples.
Percentage Change Calculator
Verified formula Updated Jun 2026 Private — runs on your device
Verified formula
Private
Percentage change
50.00%
- Absolute change
- 25.00
For general information only — not financial, tax, legal or medical advice. Verify before you rely on it.
How to use the Percentage Change Calculator
The Percentage Change Calculator works out your percentage change, along with 1 related figure in an instant. Enter original value and new value and the result updates as you type — it is free, needs no sign-up, and runs entirely in your browser so your figures stay private.
- Enter the original value.
- Enter the new value.
- Read off your percentage change, together with absolute change — the calculator updates automatically, with no button to press.
Formula
The Percentage Change Calculator uses the formula:
Percentage change = (New value - Original value) ÷ Original value × 100
Worked example
For example, with original value of 50 and new value of 75, the percentage change is 50.00%.
| Original value | 50 |
|---|---|
| New value | 75 |
| Percentage change | 50.00% |
|---|---|
| Absolute change | 25.00 |
Results are estimates for educational use, not professional advice.
Key terms explained
- Percentage
- A number expressed as a fraction of 100, written with the % sign.
Frequently asked questions
Subtract the old value from the new value, divide by the old value and multiply by 100. Going from 50 to 75 is (75 − 50) ÷ 50 × 100 = 50% increase.
A negative result means the value decreased. For example, going from 75 to 50 is a −33.33% change, a decrease of one third.
The absolute change is simply new minus old. The percentage change expresses that difference relative to the starting value, which makes comparisons fairer.
Percentage change measures growth relative to the starting point, so the original value is the base. Dividing by the new value instead answers a different question.
Enter the original value. Enter the new value. Read off your percentage change, together with absolute change — the calculator updates automatically, with no button to press.
Related guides
Percentage Change Table: Percentage change by Original value
Reference table of percentage change for Percentage Change across a range of original value values — exact, engine-computed figures you can read off at a glance.
How to Calculate Percentage Change: Formula, Steps & Examples
Learn how to calculate Percentage Change — the formula explained step by step, with worked examples and a free calculator to check your answer.