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Percentage Calculator
Solve the three most common percentage problems instantly.
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How to Use This Calculator
- What is 15% of 200? — choose mode 1, enter 15 and 200 → 30.
- 30 is what percent of 200? — choose mode 2 → 15%.
- Change from 50 to 60? — choose mode 3 → +20%.
Frequently Asked Questions
What does "percent" mean?
Percent means out of one hundred. 25% is 25 out of 100, or 0.25.
How do I calculate percent change?
Subtract the original from the new value, divide by the original, and multiply by 100. Negative means a decrease.
How do I add a percentage to a number?
Multiply the number by (100 + percent) ÷ 100. For example, add 20% to 50: 50 × 1.2 = 60.
Can percentages be negative?
Yes — usually representing a decrease or negative change in percent-change calculations.
Practical Example
Three quick scenarios:
- What is 15% of 200? → (15 ÷ 100) × 200 = 30
- 30 is what percent of 200? → (30 ÷ 200) × 100 = 15%
- Change from 50 to 60? → ((60 − 50) ÷ 50) × 100 = +20%
What Your Results Mean
- Percent of — the portion of a whole, scaled to 100.
- Percent of another number — the ratio between two values as a percentage.
- Percent change — growth (positive) or decline (negative) relative to the starting value.
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