Rock Bottom Calculator
Your Rock Bottom bar is:
500 psi
Your actual result is psi, which is too low.
For safety, use a minimum of 500 psi instead.
Your Rock Bottom psi
psi
At a depth of , your first stop is at ft.
With a combined RMV of , you and your buddy will use cf of gas to get to the surface.
The Big Equations
Total Time × Average ATA × Combined RMV = Rock Bottom in Cubic Feet
min × ata × = cf
(RB in Cubic Feet ÷ Tank Size × Rated Pressure) + optional Buffer = RB in Psi
( cf ÷ cf × psi) + psi = psi
final psi rounded to nearest 100
Let's Break It Down
(Average Depth ÷ 33) + 1 = Average ATA
( ft ÷ 33) + 1 = ATA
please read Note on Average Depth
Max Depth ÷ 2 = First Stop = Remaining Stops
÷ 2 = ft
First Stop ÷ 30 ft/min = Time to First Stop
ft ÷ 30 ft/min = min*
*rounded up to next full minute
Remaining Stops ÷ 10 ft/min = Time to Surface
ft ÷ 10 ft/min = min*
*rounded up to next full minute
Assess Time + Time to First Stop + Time to Surface = Total Time
min + min + min = min
Diver 1 RMV + Diver 2 RMV = Combined RMV
cf/min + cf/min = cf/min
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