Percentage Calculator

A percentage is a number expressed as a fraction of 100. The symbol % means 'per hundred'. For example, 25% means 25 out of every 100.

To calculate a percentage: multiply the number by the percentage and divide by 100. Example: 20% of 250 = (250 × 20) ÷ 100 = 50.

Key Features

• Three calculation modes: percentage of a number, percentage change, and base value reverse-calculation.
• Handles decimals — calculate 7.5% of 1,234 accurately.
• Instant results update as you type — no Submit button needed.
• Works entirely in your browser. No data is sent to any server.

How to Use the Tool

1. Select the type of percentage calculation you need.
2. Enter your values into the input fields.
3. The result updates automatically — no need to click Calculate.
4. Copy the result or use it directly in your work.

Core Benefits

• Avoids manual calculation errors — especially useful for finance, discounts, and tax.
• Faster than reaching for a phone calculator when working at a computer.
• No sign-up or installation — just open the page and calculate.

Common Use Cases

• Calculating a 15% tip on a restaurant bill.
• Finding a 30% discount on a product price.
• Measuring sales growth: percentage increase from last month's revenue.
• Calculating GST or VAT on an invoice.
• Converting test scores to percentages (e.g. 43 out of 60).

Pro Tips

• To find X% of Y: enter X in the percent field and Y in the total field.
• To find percentage change from A to B: use ((B - A) / A) × 100.
• A percentage increase from 100 to 150 is 50%. A decrease from 150 to 100 is 33.33% — they are not equal.