Calculators
Dive calculators, free and in your browser.
A growing set of focused tools — MOD, best mix, gas density, EAD/END — that share the same engine as the full DiveTwin planner. No login, no upload, results update as you type.
- Site Map 3DNew
Turn a hand-drawn dive site sketch into a 3D briefing for your team.
- MOD calculator
Maximum Operating Depth for any Nitrox or Trimix mix.
- Best mix calculator
Find the richest gas that respects your ppO₂ and END limits at depth.
- EAD calculator
Equivalent air depth for any Nitrox mix.
- END calculator
Equivalent narcotic depth for any Trimix or Nitrox mix.
- Gas density calculator
Inspired gas density at depth, with the 5.2 g/L threshold flagged.
- Gas blending calculator
Partial-pressure top-off recipe for Nitrox and Trimix fills.
- SAC rate calculator
Surface Air Consumption from a logged dive.
- CNS / OTU calculator
Single-exposure CNS percentage and OTU dose for any segment.
- Altitude calculator
Atmospheric pressure at altitude and altitude-corrected MOD.