Percentage Increase Calculator
Percentage increase measures growth relative to where a value started — a salary raise, a price hike or a follower count. The starting value is always the base of the calculation, which is why a rise from 100 to 125 is a 25% increase, not 20%.
The formula
Increase % = ((New − Old) ÷ Old) × 100
How to calculate it
- Subtract the old value from the new value to get the change.
- Divide the change by the old value (the starting point).
- Multiply by 100 to express it as a percentage.
Worked example
A price rises from 100 to 125. (125 − 100) ÷ 100 × 100 = 25% increase.
Quick reference table
| From | To | Increase |
|---|---|---|
| 100 | 125 | 25% |
| 50 | 75 | 50% |
| 200 | 220 | 10% |
| 80 | 100 | 25% |
| 1,000 | 1,150 | 15% |
| 40 | 120 | 200% |
Related percentage calculators
- What Is X Percent of Y?
- Percentage Decrease Calculator
- X Is What Percent of Y?
- Percent Off Calculator (Discounts)
Or use the general percentage calculator for all three percentage questions in one place.
Frequently asked questions
What is the percentage increase formula?
Subtract the old value from the new value, divide by the old value, and multiply by 100: ((New − Old) ÷ Old) × 100.
Is doubling a 100% or 200% increase?
Doubling (say 40 to 80) is a 100% increase — the change (40) equals the original (40). Tripling is a 200% increase. The 'increase' counts only the added part, not the total.
Why isn't a 100 → 125 rise 20%?
Because the base is the starting value. The change of 25 is compared against the original 100 (25%), not against the final 125 (which would give 20%).