Units & Numbers Tools
Percentage Calculator
Calculate percentages: what is X% of Y, and what percent is X of Y.
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What is Percentages?
A percentage calculator covering the three most common queries — part-of-whole, ratio-to-percent, and percent change (increase/decrease).
How it works
Each mode applies its formula (value × percent ÷ 100, part ÷ whole × 100, and (new − old) ÷ old × 100) with results rounded to your chosen precision.
- Enter your input. Type or paste your input into the field above — the tool responds instantly.
- Review the result. Output updates live as you type. Everything runs entirely in your browser.
- Copy or download. Use the Copy button to grab the result, or Download to save it as a file.
Examples
Realistic sample
Paste or type any realistic input — the tool computes the result locally and instantly.
Common mistakes
Expecting a server round-trip
Nothing is uploaded — every tool in this category runs entirely in your browser.