What is X% of Y?
% of
Result30
20% of 150
Formula: (X / 100) x Y
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Your files never leave your computer — processed in-browser with WebAssembly.
Lightning Fast
No queues, no uploads — results in milliseconds, even on mobile.
Modern & Ad-Light
Clean interface, dark mode, and no popups — built to beat legacy tools.
What you get
- Discount & markup modes
- Step-by-step results
- Mobile friendly
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Frequently asked questions
Enter the percentage and the value, and the calculator instantly shows the result along with the step-by-step calculation.
Yes — switch between modes to calculate discounts, markups, tax additions, and percentage increases or decreases.
Enter both numbers into the relevant fields, and the calculator shows you the percentage relationship between them instantly.
Yes — step-by-step results are displayed so you can understand, or double-check, the math behind each calculation.
Yes — the tool is fully mobile-friendly and works smoothly on phones, tablets, and desktops.