Percentage Calculator — Free Browser Tool
Choose the calculation mode.
Introduction
This percentage calculator online covers three common questions: a percentage of a number, one value as a percentage of another, and change from an original value. Use it to check marks, quantities or everyday comparisons.
How to Use
- Choose the calculation mode.
- Enter the two values using the field labels and mode formula.
- Select Calculate percentage.
- Read the result and adjust the inputs to compare another example.
Why Use This Tool
- Three percentage formulas are available without switching pages.
- Free to use, with no signup.
- Entered data is processed locally without application storage.
Frequently Asked Questions
Which number goes in each field?
In “A% of B”, A is the rate and B is the whole. In “A as % of B”, A is the part and B the whole. For change, A is the original and B is the new value.
How are zero and negative values handled?
A zero whole cannot be used for a share, and change from zero is undefined. Change uses (B − A) ÷ |A| × 100, so review whether that convention suits comparisons involving negative values.
Are my calculation inputs kept anywhere?
Kalika computes the answer in this tab and does not upload or save the numbers.