Percentage Calculator
Work out what X% of a number is — and switch to the other common percentage questions too.
How to use this tool
- 1Paste or type your input above.
- 2The result updates instantly.
- 3Copy the output with one click.
Frequently asked questions
How do I calculate a percentage of a number?+
Multiply the number by the percentage and divide by 100. For example, 15% of 200 = 200 × 15 ÷ 100 = 30.
Is my data private?+
Yes. The tool runs entirely in your browser — nothing you paste or type is uploaded to a server.
Guides & deep dives
GST Rates in India: Slabs, CGST/SGST Split and Examples
Master India's GST slabs — 0%, 5%, 12%, 18%, 28% — with real item examples, CGST/SGST/IGST explained, and step-by-step inclusive vs exclusive tax math.
How Your Due Date Is Calculated (and How Accurate It Is)
Learn how Naegele's rule, LMP, and ultrasound dating work together to set your due date — and why only about 5% of babies arrive on that exact day.
KM to Miles: The 0.62 Rule and Conversion Chart
Convert kilometers to miles using the exact 0.621371 factor. Includes a quick 0.62 mental trick, running race table, speed limit guide, and Fibonacci shortcut.
What Every Invoice Must Include (With Example)
A practical guide to every field a legally valid invoice needs — required elements, numbering schemes, payment terms, late fees, and digital vs. paper rules.