Percentage calculator — of, is-what-percent, and change
Work out a percentage of a number, what percent one number is of another, or the percentage change between two — all in your browser (0 uploads, works offline).
How to use it
- Enter your values in the fields above.
- The result and a short explanation appear instantly.
- Copy or Download the result.
FAQ
How do I calculate a percentage for free?
Pick a mode, enter the two numbers, and the answer appears instantly in your browser with no upload. "X% of Y" multiplies; "X is what % of Y" divides; "% change" measures the increase or decrease from one value to another.
How do I calculate percentage increase or decrease?
Choose the "% change" mode and enter the old value as X and the new value as Y. A positive result is an increase, a negative one a decrease, computed as (new − old) ÷ old × 100.
Is my data uploaded?
No. The calculation runs locally and nothing is stored; it works offline.
Can it show the working?
Yes — every result includes the formula used, so you can check it or learn from it.
Limits
Handles the three common percentage questions. For discounts with GST, use the discount calculator.
Related
The discount calculator applies a percentage off a price; the GST calculator handles tax.
Bookmark this page (Ctrl+D, or ⌘D on Mac) or install the app — it works offline the next time you need it.