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SAC

Surface Air Consumption

Your breathing rate at the surface, as cylinder pressure per minute, from a real dive.

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.
Fresh water is less dense than salt water, so the same pressure is reached a little deeper (10.3 m per bar, against 10 m in salt water).
Your dive
Your cylinder pressure when you started the dive, from your gauge or computer.
Your cylinder pressure when you surfaced. It must be lower than the start.
How long the dive took, from leaving the surface to surfacing.
The average depth of the dive, from your computer's log. Not the deepest point.

I think this is an error

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