SCUBA Diving Reference
Nitrox and dive gas calculator for iPhone and iPad
Dive Ref does the gas sums an Open Water or nitrox diver works out on a slate, and shows the working behind every answer. Use it on the boat, the beach or the bank, before the dive and after it. Air and nitrox to EAN40, at depths to the recreational limit of 40 m or 130 ft.
Features
- Gas: whether a mix is safe to breathe at a depth, its maximum operating depth at your oxygen limit, oxygen partial pressure, equivalent air depth, and the best nitrox for the dive
- Dive: a no-stop dive as one level or several, with descent, ascent and a 3-minute safety stop added and drawn on a profile
- Gas for the dive, minimum gas for you and an out-of-air buddy, turn pressure by halves or thirds, and the pressure you surface with
- Oxygen exposure (CNS) for every plan
- A no-stop check on every plan, Bühlmann ZH-L16C at gradient factor 85, with the minutes to spare or a plain warning that the dive needs stops
- Your breathing rate measured from a timed swim or a logged dive
- Saved dives, searched by name, and shared as a slate card
- Learn: 27 diving terms in plain English, each with why it matters
- Tools: cylinder contents and gas weight, fresh-to-salt weighting, and a converter for pressure, depth, volume and temperature
- Every result opens to show its formula, then the same formula with your own figures in it
- Salt or fresh water, altitude, and metric or imperial, set once for every tab
- Universal — on iPad and the iPhone Duo’s inner display, the inputs and the results sit side by side
- No account, no network access and no tracking
A Planning Tool
Dive Ref is for planning before a dive and checking after it. It is not a dive computer and it does not plan decompression stops. Dive within your training, analyse every cylinder before use, and let your dive computer and your buddy have the last word.
Support
Have a question, a problem, or an idea? Reach us here:
- Ask a question — help with using Dive Ref
- Report a bug — something isn’t working
- Request a feature — suggest an improvement
You can also browse existing issues to see whether your question has been answered.