Using this tool
Calculate percentages, changes, original prices and proportions, with shortcuts to date and unit calculations.
Understand the calculation and data coverage before relying on a result. Read the guidance and tool-specific limits below.
- Choose the options and enter your values below.
- Press the action button to see your result.
- Copy your result or save the output file.
What to know
Percentage change is (new−old)÷old×100. Original price is discounted price÷(1−discount÷100). Division by zero is rejected; displayed decimals are rounded.
Common questions
Do I need to install an app or sign in?
No. Open it in a modern browser and start.
Where is my input processed?
Files and input content are not uploaded to GameNow.