Three common percentage calculations in one place. Choose the relationship, then enter A and B using the labels described by the mode.
Optional, unencrypted storage in this browser only. Do not save secrets on a shared device. Nothing is saved automatically.
My workspace →For “A% of B,” 20 and 100 produce 20. For change from A to B, 80 and 100 produce a 25% increase.
Percent of: A ÷ 100 × B Percentage ratio: A ÷ B × 100 Change: (B − A) ÷ A × 100
The starter inputs above produce:
20% of 100: 20
Change the inputs to match your own situation. The result is an estimate or text transformation, not a substitute for reviewing your source data.
In change mode, A is the old value and B is the new value.
Yes. A drop from a positive starting value yields a negative percentage change.
No. This release runs without an account, API key or payment. Saving a favorite stores only the tool’s identifier in this browser, not your inputs.