Tools
Unit Converter
Convert between common diving units for pressure, temperature, volume, depth, weight, and breathing rate, in both directions, independent of your app settings.
Last updated 3 июня 2026 г.
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What it is
Divers around the world mix unit systems. Your boat briefing might be in metres while your cylinder is stamped in PSI and your buddy’s computer reads feet. The Unit Converter does quick, two-way conversions across the units you actually use underwater, so you can translate a number without doing the arithmetic on a wet slate.
It works in six categories: pressure, volume, depth, temperature, weight, and SRMV/SAC (surface respiratory minute volume / surface air consumption), the breathing-rate category.
How to use it
- From the Plan tab, open Unit Converter.
- Pick a category from the toggle group at the top (Pressure, Volume, Depth, Temperature, Weight, or SRMV/SAC).
- You get two cards with a vertical swap-style icon between them showing the two directions. The icon is just a visual separator, not a button. Each card has a unit selector and a number field.
- Type a value into either card. The other side updates instantly, in both directions.
- Change the unit on either card and the displayed value re-converts to the new unit.
A unit already chosen on the opposite card is disabled, so you can never convert a unit to itself.
Most categories start at 0 as their lowest value. Temperature is the exception: it accepts negative values down to about -273 C (absolute zero), so you can convert sub-zero water and air temperatures. Step sizes are unit-aware, for example 0.1 for cubic feet and ft³/min where a finer step matters.
Categories and units
| Category | Units | Default value |
|---|---|---|
| Pressure | bar, PSI, MPa | 200 bar |
| Volume | Litres, Cubic Feet | 12 L |
| Depth | Metres, Feet | 30 m |
| Temperature | Celsius, Fahrenheit, Kelvin | 25 C |
| Weight | kg, lbs | 15 kg |
| SRMV/SAC | L/min, bar/min, ft³/min | 20 L/min |
SRMV/SAC mode needs a cylinder size
Breathing rate is special. A pressure-based rate in bar/min depends on the cylinder you are breathing from, because the same air consumption drops the pressure faster in a small cylinder than a large one. So when one side of an SRMV/SAC conversion is set to bar/min, an extra Cylinder Volume input appears. Fill that in and the tool can convert between volume-based rates (L/min, ft³/min) and pressure-based rates (bar/min) correctly.
The cylinder volume starts at 12.2 L (a common steel cylinder) and its unit follows the volume side: litres when the other card is L/min, cubic feet when it is ft³/min.
Behaviour and limits
The Unit Converter is a standalone scratchpad. It does not read or change your app-wide unit setting (the metric or imperial preference that controls how the other tools display depth, pressure, and so on). Converting here never alters how the Deco Planner or any other screen shows its numbers.
It is a conversion aid, not a gas-planning tool. For breathing-rate planning that ties into a real dive, use the SAC/SRMV calculator and the gas tools instead.
Related
- Deco Planner does full multi-gas dive planning where you will read converted numbers in context.
Parts of this guide were drafted with AI assistance and may contain mistakes. It's educational, not a substitute for training. Always dive within your certification and verify with your instruments.