Photographic film development tools
Push/Pull compensation Calculator
This calculator subtracts the chosen % for every pull stop, adds 50% for every push stop to 2 stops, then ramps up to 3 stops.
These numbers are a guide, they come from rules of thumb and, good old trial and error.
Each film and development chemical mix will have different response curves.
Always test on unimportant shots, using these numbers may lead to unexpected results.
If that happens don't blame me, this is just a calculator not a development rule book.
If the unexpected results look good then congrats, if not just call it "Art".
Enter the dilution ratio and batch size to find out how much of each ingredient you need.