I made a calculator in excel to make dilution ratios easier to calculate:
It' will work with:
1:14 - single developer ratios (ie. Ilfosol S)
and 1:2:100 - a/b solution ratios (ie. PMK Pyro)
Also included a simple ml. to US FL oz. and US FL oz. to ml. calculator just because it could be useful.
http://www.mikefiction.com/calc/DilutionCalc.xls
You can change the volume to any amount and it will re-calculate the ratios. That's kinda why I added the ml - oz conversion
That way if I'm using my combiplan tank, it's 36 US fL oz, so I convert that to ml, which is 1064.65 - then type the ml amount 1065 into the Target Volume field on the dilution calc and it recalculates for that volume. So it'll work on any tank.