Percentage Calculator
Every everyday percentage: what is P% of a number, A is what percent of B, and percentage change.
What is P% of a number
A is what percent of B
Percentage change (from → to)
About this tool
Calculate percentages — the three most common questions in one place: what is P% of a number (discounts, tips), what percent A is of B (proportions, scores), and percentage change from one value to another (price moves, growth). Every row computes instantly as you type.
It's perfect for working out shopping discounts, tips, sales growth, or converting scores to percentages. Need to add value-added tax too? Use the VAT calculator (7%) alongside it.
A few worked examples: a 25% discount on a ฿1,890 jacket saves ฿472.50, so you pay ฿1,417.50. Scoring 38 out of 45 on a test is 84.4%. A shop whose revenue went from ฿120,000 to ฿150,000 grew 25%, while a price that fell from ฿900 to ฿765 dropped 15%. The three rows cover all of these without you having to remember which way round to divide — and because everything runs in your browser, it works offline and nothing you type is sent anywhere.
How to use
- 1Choose your question: what is P% of a number, A is what percent of B, or percentage change
- 2Enter the two numbers in that row
- 3The answer appears instantly on the right — no calculate button
Frequently asked questions
- How do I find 20% of 150?
- Use the first row: type 20 and 150 to get 30 (20% of 150 = 30). Great for discounts, tips or simple interest.
- How do I find what percent one number is of another?
- Use the second row — e.g. 30 is what percent of 150 gives 20%. Handy for proportions or test scores.
- How do I calculate percentage increase or decrease?
- Use the third row with a start and end value: 100 → 125 gives +25%, and 200 → 150 gives −25%. Ideal for price moves or growth.
- Can I use it for shopping discounts?
- Yes. Use the first row to find X% of a price, then subtract it from the full price.