Step by step
- Enter the old value (before).
- Enter the new value (after).
- Read the percentage change; positive means an increase.
At a glance
| Question | Calculation | Answer |
|---|---|---|
| Price from 80 to 100 | (100 − 80) ÷ 80 × 100 | +25% |
| Salary from 2,000 to 2,150 | 150 ÷ 2,000 × 100 | +7.5% |
| Followers from 500 to 1,500 | 1,000 ÷ 500 × 100 | +200% |
Related questions
Why not divide by the new value?
The increase is measured against where you started; dividing by the new value gives a different, smaller number.
Can an increase be over 100%?
Yes, anything more than doubling is over 100%; tripling is +200%.
How do I add a percentage instead?
Multiply by (1 + percent ÷ 100): 80 × 1.25 = 100.
More questions: percentage calculator
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Open the full percentage calculator →
Updated November 14, 2026.