---
title: "The gas consumption view"
description: "The Review step's Gas Consumption view: the per-level ledger, one card per cylinder, and the labels that say the plan does not fit."
---

> Documentation Index
> Fetch the complete documentation index at: https://docs.divelogic.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# The gas consumption view

import { GasLedger } from "@/components/react/ReviewScreens";
import { trimixDeco } from "@/demo/plans";

The **Gas Consumption** view answers one question: does the plan fit in the
cylinders you are carrying. A line across the top repeats the two rates the
figures depend on, **Working SAC** and **Deco SAC**, in L/min; change them in
the [Breathing Rates card](/planning/breathing-rates).

## The per-level ledger

One card per planned level, in dive order, naming the level and the gas breathed
on it. Six figures per card, all in bar except the last:

- **Leaving at**: what is left in the cylinder when you leave that level.
- **Turn pressure**: the pressure at which you must turn the dive, being the
  cost of reaching the next switch plus the reserve.
- **To next switch**: what reaching the next gas switch will cost from here.
- **Reserve**: a third of the starting pressure, held back.
- **Start pressure**: what you began the level with.
- **Runtime**: where in the dive this level sits. Minutes, not bar.

Two words can appear on a card. **Below turn**: what is left has already fallen
past the turn pressure for that level, so the plan has no reserve in hand.
**Supply exceeded**: the cylinder cannot cover the level at all, and every
pressure on the card is shown in the error tone. Missing figures mean a gas with
no tank size or no working pressure behind it.

## One card per gas

Each gas then gets a card of its own: the mix name and colour, tags for the
cylinder and the role, a consumption bar, then the numbers.

- **Starting Pressure**, **End Pressure**, **Used Pressure** and **Remaining**,
  as a percentage.
- Where the cylinder's size is known, the same four again in litres: **Starting
  Litres**, **End Litres**, **Used Litres** and the litres remaining.

**Low gas** means the plan finishes on this cylinder with little in hand.
**Insufficient gas** means it does not finish at all, and the card is toned
accordingly. Neither changes the schedule: the planner will draw an ascent your
gas cannot pay for.

## On a rebreather

The view describes open-circuit gas only: the loop's own consumption, diluent
and oxygen, is not estimated anywhere in DiveLogic. Each selected scenario adds
its own block of cards, covering the ascent from its bail point onward at the
[bailout pair](/planning/ccr-settings) rather than the loop rates.

> **Caution**
>
> On the **loop** plan, the figure against a bailout cylinder is the whole dive
> replayed at the bailout rates from the surface, attributed to each bailout
> cylinder in turn. Read it as a stock check on one cylinder, never as a sum
> across your bailout gases. See [Bailout scenarios](/ccr/bailout).

## Next

[The tissue saturation view](/planning/review-tissues), and
[Consumption](/gases/consumption) for how a surface rate becomes a volume at
depth.

Source: https://docs.divelogic.ai/planning/review-gas/index.mdx