Percentage Calculator
Calculate percentages, percentage changes, and proportional values instantly.
Choose a calculation and enter values.
How to use this tool
Choose the calculation type, enter X and Y, and select Calculate. Use percentage change when comparing an old value with a new one.
Frequently asked questions
How is percentage change calculated?
The difference between the new and old values is divided by the absolute old value and multiplied by 100.
Can the starting value be zero?
No. Percentage change from zero is undefined in this calculator.