Percentage Increase Calculator
Add a percentage to a number, or find the percent increase between two values.
Increase a number by a percentage, or find out the percentage increase between a starting value and a higher ending value. Results appear as you type, with the formula shown.
Percentage increases describe growth — a price rise, a pay raise, traffic up month over month. This tool handles both directions: applying a known percentage, or measuring the percentage from two numbers.
📖 Read the guide: Percentage Increase vs Decrease: Why They Don't Cancel Out
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Formula
Increase a value by a percent
value × (1 + percent ÷ 100) = result
Add the percentage to the original. Example: 200 increased by 25% → 200 × 1.25 = 250.
Percent increase between two values
((new − old) ÷ old) × 100 = increase %
Subtract the old value, divide by the old value, multiply by 100. Example: 200 → 250 = +25%.
How to use the percentage increase calculator
- 1Choose a mode: increase a number by a percent, or find the percent increase between two numbers.
- 2Type your values — the new amount (or percentage) updates instantly.
- 3Copy the result, or share the page URL to send the same calculation to someone else.
Examples
| Example | Input | Result |
|---|---|---|
| Increase by a percent | 200 + 25% | 250 |
| Percent increase | 200 → 250 | +25% |
| Pay raise | $50,000 + 4% | $52,000 |
How to calculate a percentage increase
To increase a number by a percentage, convert the percentage to a decimal and multiply: a 25% increase means multiplying by 1.25. To find the percentage increase between two numbers, take the difference, divide by the original (smaller, earlier) value, and multiply by 100.
The original value is the key: a percentage increase is always measured relative to where you started. Going from 50 to 75 is a 50% increase, because the 25 gained is half of the original 50.
Where percentage increases show up
Salary raises, rent and price rises, tax and tip add-ons, inflation, audience and revenue growth, and grades or scores that improved. Any time something grew and you want to express that growth as a rate rather than a raw amount, a percentage increase is the right tool.
Frequently asked questions
How do I increase a number by a percentage?
Multiply the number by (1 + percent ÷ 100). To increase 80 by 15%, calculate 80 × 1.15 = 92.
How do I find the percentage increase between two numbers?
Subtract the original value from the new value, divide by the original value, then multiply by 100. From 40 to 50 is (50 − 40) ÷ 40 × 100 = 25%.
Is a percentage increase reversible?
No. Increasing 100 by 20% gives 120, but decreasing 120 by 20% gives 96, not 100 — because the base changed. Use the percentage decrease calculator for the reverse.
Does this store my numbers?
No. Everything is calculated in your browser; nothing is uploaded or saved on a server.
Embed this calculator
Add the Percentage Increase Calculator to your own website — free. Copy and paste this snippet:
<iframe src="https://numvella.com/embed/percentage-increase-calculator" width="100%" height="460" style="border:1px solid #e2e8f0;border-radius:12px" title="Percentage Increase Calculator — Numvella" loading="lazy"></iframe>Related calculators
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