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Gas Blending

Have / Want / Need

From what is in the cylinder now to the mix you want: top-up and partial-pressure fills.

Metric shows depths in metres and pressures in bar; Imperial in feet and atm. Your choice is kept across every formula for this visit.
Recreational limits mixes to 21–40% oxygen (nitrox). Technical allows any oxygen percentage up to 100% and trimix (helium). Granular lets you type exact values, to a decimal place. Your choice is kept across every formula for this visit.
What you have
The oxygen in the cylinder now, as your analyser reads it. 21% is air.
The pressure in the cylinder now. Choose 0 for an empty one.
What you want
The oxygen you want in the finished fill.
The pressure to finish at. It must be above the pressure now.
Your gases
Tick the nitrox your fill station has, if any: most have none, so leave them off. With more than one ticked, the fill uses the leanest that needs no pure oxygen.
Tick the nitrox your fill station has, if any: most have none, so leave them off. With more than one ticked, the fill uses the leanest that needs no pure oxygen.
Tick the nitrox your fill station has, if any: most have none, so leave them off. With more than one ticked, the fill uses the leanest that needs no pure oxygen.

I think this is an error

This sends the calculation on this screen, exactly as it is now.