％ Percentage Calculator
Common percentage calculations: share, change and base value
✓ Runs entirely in your browser — your data never leaves this device
About This Tool
Three everyday percentage calculations: X as a percent of Y, a value increased/decreased by N%, and the percent change between two numbers. Results are instant — handy for reports and pricing.
How to Use
- Type any two numbers in the row you need
- Results update automatically — no button
- The three rows work independently
FAQ
Percent change formula?
(new − old) ÷ old × 100%. A negative result means a decrease.
Negative growth?
Yes — it simply shows as a negative percentage.