Trimix Blend Calculator
Calculate MOD, Equivalent Narcotic Depth (END), partial pressures, and hypoxic safety for Trimix gas blends used in technical deep diving.
Inputs
%
%
Results
MOD (metres)
56.7
END (metres)
35.5
MOD (feet)186
END (feet)116
Nitrogen (%)44
ppO2 at depth1.47
ppN2 at depth3.08
ppHe at depth2.45
Hypoxic at surface?0
Min switch depth (m)0
How to Use This Calculator
- Enter the oxygen percentage in your Trimix blend (e.g., 21% for normoxic, lower for hypoxic mixes).
- Input the helium percentage — helium replaces nitrogen to reduce narcosis at depth.
- Set your planned maximum depth in meters.
- Set your ppO2 limit in bar (1.4 for bottom gas, 1.6 for decompression).
- Read MOD in meters to confirm your dive plan stays within safe oxygen limits.
- Check END (Equivalent Narcotic Depth) in meters — ideally keep END below 30 m to minimize narcosis risk.
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