Percentage Calculator
Four mini-tools in one: What is X% of Y, X is what percent of Y, Percentage increase/decrease, and Add/Subtract a percent. This covers almost every real-life percent problem (discounts, VAT, tips, markups, grades, analytics).
Result
Answer
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Steps
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Percentage formulas used here
1. What is X% of Y?
\(\text{Result} = \dfrac{X}{100} \times Y\)
2. X is what percent of Y?
\(\text{Percent} = \dfrac{X}{Y} \times 100\)
3. Percentage change
\(\text{Percent change} = \dfrac{\text{New} - \text{Old}}{\text{Old}} \times 100\)
4. Add/Subtract percent
\(\text{New} = \text{Original} \times (1 \pm \dfrac{p}{100})\)
When to use which mini-tool
- Shopping, VAT, tips → “What is X% of Y”.
- Exam scores, KPIs → “X is what percent of Y”.
- Price changes, analytics, growth → “% increase/decrease”.
- Markup / discount directly → “Add/Subtract %”.
FAQ
Can I enter decimals?
Yes, enter 12.5, 0.5, 99.99 — the calculator will handle them.
What if the denominator is 0?
You can’t divide by zero — the tool will show an error for those cases.