Percentage calculator — offline
The three percentage questions everyone actually asks — answered instantly on your device.
100% private — files never leave your device
What is % of ?
30
is what percent of ?
15 %
Change from to ?
50 %
How it works
- 1
Fill in the numbers in any of the three rows.
- 2
Results update live.
- 3
All three calculators work independently.
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Frequently asked questions
What can this calculate?
The three everyday percentage questions: what is X% of Y, what percent of Y is X, and the percentage change from one value to another.
Is anything sent to a server?
No — it's arithmetic in your browser, and it works offline.
How is percentage change computed?
(new − old) ÷ |old| × 100 — a rise from 50 to 75 is +50%, a drop from 80 to 60 is −25%.