Percentage calculator
Calculate percentages, percentage change, increases and decreases on your device.
Tool guide
How to use Percentage calculator
Calculate percentages, percentage change, increases and decreases on your device.
- Enter the values and choose the operation or units. Read the supported limits beside the inputs; try the labelled sample to see an example.
- Plain decimal numbers only (dot decimal, no grouping or currency symbol). Calculations stay on your device. Percentage change divides by the signed original value.
- Choose Calculate percentage. Review the result, then download the text result. Editing inputs invalidates old results.
- Calculations are local and unmetered. Inputs and results are not uploaded or saved to your account; leaving the page clears them. Downloaded files remain on your device.
Common questions
What are the limits of Percentage calculator?
Input magnitudes ≤10^15. A nonzero base is required for ratio/change. Plain decimal numbers only (dot decimal, no grouping or currency symbol). Calculations stay on your device. Percentage change divides by the signed original value.