Gas planning / Calculator 06
Turn Pressure Calculator
Estimate ascent gas, an additional reserve, and a turnaround pressure using half the gas available above that reserve.
The numbers / explained
Ready when you are.
Start with the example or enter your own numbers, then calculate.
Every result includes units. All calculations run in your browser.
01 / The calculation
How it works
Convert SAC to RMV. Multiply consumption by divers sharing gas and the ascent consumption multiplier. Integrate average ambient pressure on ascent at 30 ft/min (10 m/min), including a three-minute stop at 15 ft (5 m). Add the extra reserve. Turn pressure = (starting pressure + ascent/reserve pressure) ÷ 2, rounded up.
Reference: DAN: Air consumption and gas planning02 / Before you use it
Keep in mind
An illustrative open-water model: no delay at depth, decompression, overhead, current, unequal cylinders or return-time imbalance. Defaults allow two divers at twice the entered consumption during ascent. A real emergency plan must account for the team's needs and conditions; the result is not a guarantee of sufficient gas.