Mix It Up!
Partial pressure method · He → O₂ → Top-off
Current Tank
Pressure
psi
O₂ %
He %
N₂ %79.0
Target Mix
Pressure
psi
O₂ %
He %
N₂ %20.0
Top-off Gas
O₂ %
He %
N₂ %79.0
Drain To
Drain toNo drain needed
Gas to Add
Helium
2,100psi
Oxygen
141psi
Top-off air
759psi
Fill To (gauge readings)
Dive Data
Planned depth
fsw
ppO₂ at depth—
END at depth—
MOD @ ppO₂ 1.2—
MOD @ ppO₂ 1.3—
MOD @ ppO₂ 1.4—
MOD @ ppO₂ 1.6—
Best I can do is...
—
Current Tank
Pressure
psi
O₂ %
He %
N₂ %34.0
Fill Gas
O₂ %
He %
N₂ %20.0
Final Pressure
Fill to
psi
Resulting Mix
13/59
O₂ / He
13.4
O₂ %
58.7
He %
27.9
N₂ %
Dive Data
Planned depth
fsw
ppO₂ at depth—
END at depth—
MOD @ ppO₂ 1.2—
MOD @ ppO₂ 1.3—
MOD @ ppO₂ 1.4—
MOD @ ppO₂ 1.6—
What Gas Do I Need?
Target Pressure
psi
Target O₂ %
Target He %
MOD Calculator
O₂ %
He %
N₂ %20.0
Maximum Operating Depth
MOD @ ppO₂ 1.2—
MOD @ ppO₂ 1.3—
MOD @ ppO₂ 1.4—
MOD @ ppO₂ 1.6—
END at MOD
END @ MOD 1.2—
END @ MOD 1.3—
END @ MOD 1.4—
END @ MOD 1.6—
Best Mix Calculator
Planned depth
fsw
Target END
fsw
Best O₂ % for depth
@ ppO₂ 1.2—
@ ppO₂ 1.3—
@ ppO₂ 1.4—
@ ppO₂ 1.6—
He % for target END
He needed—
Recommended Mixes
Shop Fills (pre-trip)
Boat Fills (field)
Shop Supply (order from supplier)
He
Recv:
psi
O₂
Recv:
psi
Supply Gas Settings
Floor
psi (empty point)
Extra
% contingency
He $
per bottle
O₂ $
per bottle
Results
Add a gas to see results