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END

Equivalent Narcotic Depth

How narcotic a trimix is, as the depth of air that would feel the same.

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).

This formula is for technical diving, so it opens in Technical mode.

Your gas and depth
Typical floor is 5%, but we allow lower values for more extreme settings.
The helium in a trimix. Helium is the one gas here that isn't narcotic, so more of it lowers the END; O₂ + He can't exceed 100%.
The deepest point of your planned dive, to 100 m (330 ft).
Used only for the check under the result: the oxygen limit this depth is held to. 1.4 is the usual working limit; 1.6 is the contingency limit.

I think this is an error

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