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Air Usage Calculator

This Air Usage Calculator for Scuba Divers is based on the BSAC recommended method for calculating the air used on a given dive. It assumes a 'square profile' dive (ie worst case) where you breathe at the maximum rate at depth all through the dive. Please note that this is a planning tool and should be based on a realistic breathing rate at the surface (BSAC recommend 25 litres/minute for diving in UK waters). The resulting bottom time should be used as a planning guideline, and the user must be personally responsible for monitoring air usage during the dive.

Instructions: Type the values into the first four cells for your tank size, pressure, and the planed depth and reserve; then press calculate, and the mathematical forecast will be produced. Remember that this is a planning tool and it better to be conservative with estimates to improve your safety margins. Every time you press calculate the figures will be updated.

Tank size in Litres : eg.12.0
Tank pressure in Bar : e.g 200
Maximum Depth in metres : e.g. 35
Air usage (litres/Minute) e.g 25
Air Reserve in Bar :
Maximum Dive Time in Minutes Safety Time in minutes;
Please Note:Consult your decompression tables to ensure that the planned bottom time does not exceed your no-stop dive time.

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