---
title: "Using the tools"
description: "Where the ten calculators are, what they share, and how to read the figures, rails and verdict each one returns."
---

> 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.

# Using the tools

import { ToolListPhoneScreen, ToolsPageScreen } from "@/components/react/ToolScreens";

The tools are ten calculators that each answer one question without a dive
plan behind them: a mix at one depth, a fill, a breathing rate, an oxygen
exposure. They use the same limits and checks the planner applies to a plan.

## Finding the tools

- **On a desktop**: choose **Tools** in the rail. The list of tools sits beside
  the open tool, and the section reopens on the tool you used last.
- **On a phone**: Tools is not on the tab bar. Open **Home** and choose the
  **Tools** card. The list fills the screen; choose a tool to open it, and the
  back chevron returns to the list.

The tools are grouped as they are in the app:

- **Gas**: [Mix at depth](/tools/mix-at-depth), [Best mix](/tools/best-mix),
  [Gas switch](/tools/gas-switch).
- **Blending**: [Partial-pressure fill](/tools/partial-pressure-fill).
- **Consumption**: [RMV from a dive](/tools/rmv-from-a-dive),
  [Gas needed](/tools/gas-needed), [Turn pressure](/tools/turn-pressure),
  [Minimum gas](/tools/minimum-gas).
- **Oxygen**: [CNS and OTU](/tools/cns-and-otu),
  [Oxygen time limit](/tools/oxygen-time-limit).

Every figure is worked out on your device, so the tools work offline and need
no connection or sign-in to the server. What you type is remembered on this
device only; it is not saved to your account and does not follow you to
another one.

## Reading a result

Each tool shows its question at the top, the fields, and a readout that updates
as you type.

- **The main figure** answers the question. Supporting figures sit below it.
- **The rail** under a figure is a gauge. A solid mark is a hard limit; a
  dashed mark is an advisory. The fill turns amber past an advisory and red past
  a limit. Every mark carries its value in words beside it.
- **The verdict** is the sentence under the figures. It gives the most serious
  finding, or the all-clear, in words.
- **The method note** at the foot of the tool says which convention the figures
  follow.

When an input is refused, such as an end pressure above the start pressure,
the verdict says why and the figures from the last accepted inputs stay on
screen in grey until you correct it.

## What the consumption tools share

Gas needed, Turn pressure and Minimum gas read the same **Breathing** and
**Cylinder** fields, so you set your **RMV**, cylinder **Size, each**, **Start**
pressure, **Cylinders** and **Water** once, and a change in one tool shows in
the other two. RMV from a dive can write a measured RMV into them with its
**Use** button.

Every tool works at sea level. There is no altitude setting; plan a dive at
altitude in the planner, which accounts for it.

## Next

[Mix at depth](/tools/mix-at-depth) is the first tool in the list.

Source: https://docs.divelogic.ai/tools/using-the-tools/index.mdx