Percentage Calculator On-device
Every percentage question, one tool.
What is …% of …?
Work out percentages instantly: a percentage of a number, what percentage one number is of another, percentage increase or decrease, adding or removing a percentage, and reverse percentages. Runs entirely on your device.
About this tool
What you provide
- One of five questions: a percentage of a number, what percentage one number is of another, the change between two numbers, adding or removing a percentage, or a reverse percentage.
- Two numbers, typed with Arabic-Indic or Latin digits.
What you get
- The result, with the question restated in words.
- For a change, the signed percentage labelled as an increase or a decrease.
Limits
- Asking what percentage a number is of zero, a change starting from zero, or a reverse percentage of 0% has no answer, so the tool asks for a non-zero number instead.
- Nothing you type leaves your device.
How to use it
Pick the question
Choose one of the five modes: % of a number, X is what % of Y, % change, Add / subtract %, or Reverse %.
Enter the two numbers
Fill the two fields, which rename themselves to match the mode — Percentage and Number, Part and Whole, or From and To — using Arabic-Indic or Latin digits; Add / subtract % adds an Add or Subtract switch above them.
Read and copy the result
The result appears under the question written out in words, labelled increase or decrease in % change mode, with a Copy button beside it and Copy link to this result for a link that reproduces the same calculation.
Frequently asked questions
What kinds of percentage questions does this calculator answer?
Five: a percentage of a number, what percentage one number is of another, the increase or decrease between two numbers, adding or removing a percentage from a value, and working back to the original number when you know the result and the percentage.
Does it handle a percentage increase and a decrease differently?
The change between two numbers is reported with its sign, so an increase reads as positive and a decrease as negative rather than as a bare number.
Is anything I type sent to a server?
No. The calculation runs in your browser and nothing you enter leaves your device.