Dive Planning

Gas Consumption Planner

Model gas use for a depth-and-time profile with a selected pressure allocation. Cross-check minimum gas and every other dive limit separately.

Your Gas Consumption

Input Mode

RMV / SAC Rate

L/min

Dive Plan

Planned Depth

Bottom Time

min

Advanced transit assumptions

Defaults are suitable for a typical plan. Adjust them to match your training and conditions.

Descent Rate

m/min

Ascent Rate

m/min

Tank & Reserve

Tank Water Volume

Working Pressure

BAR

Tanks

Reserve Method

Fixed pressure allocation of 50 BAR. It is not a universal minimum-gas calculation; confirm a reserve for the actual dive and team.

Primary result

Does not cover modeled profile

0.0 L usable gas remains after the modeled profile.

Start over

Gas model only

Covers modeled profile only. NDL/decompression obligations, emergency or minimum gas, gas suitability, equipment, conditions, and training limits are not validated; this is not permission to conduct the dive.

Gas Planning Results

Gas Required

2,833 L

at 20 m for 45 min (includes ascent/descent)

Usable Gas

1,743 L

Does not cover modeled profile

Gas-limited modeled time

26 min

gas use only: after 1.1 min descent + 2.2 min ascent

Projected End Pressure

0 BAR

after descent, bottom time, and ascent

What-If Scenarios

+5 min

longer

3,133 L

Does not cover scenario

+5 m

deeper

3,338 L

Does not cover scenario

Both

+5 m & +5 min

3,688 L

Does not cover scenario

Modeled gas shortfall: The entered supply does not cover this profile. Reduce depth or time, use more gas, or verify that the entered RMV is a realistic conservative planning rate.

Plan status

Modeled gas shortfall

Required: 2,833 L
Usable: 1,743 L

How It Works

This planner models gas use from breathing rate, depth, time, and transit assumptions. It compares the modeled demand with the supply above your selected pressure allocation; it does not authorize a dive or time at depth.

Your Breathing Rate

Your RMV (Respiratory Minute Volume) or SAC (Surface Air Consumption) rate is how much gas you breathe per minute at the surface. Use the SAC Rate Calculator to find yours from logged dives.

Depth Matters

Gas consumption increases with depth because the air is denser. At 20m you breathe 3x as much gas as at the surface.

Pressure Allocation Methods

• Fixed pressure allocation (50 BAR)

A simple planning input, not a universal recreational reserve or an emergency/minimum-gas calculation.

• Rule of thirds allocation

Allocates 1/3 outbound, 1/3 return, and 1/3 for contingencies. Appropriate use depends on the exit, team, cylinders, and training; compare it with minimum gas.

• Custom pressure allocation

Set a pressure allocation based on the trained plan, then cross-check emergency/minimum gas separately.

Tips for Gas Planning

• Know your RMV rate

Track your SAC rate over multiple dives to get an accurate personal RMV

• Plan conservatively

Use a higher RMV than your average to account for currents, stress, and exertion

• Monitor during the dive

Check your SPG frequently and compare actual consumption to your plan

• Plan to surface with reserve intact

Plan to surface with the reserve intact; it is not planned bottom-time gas. In an emergency, it is contingency gas available to support the exit.