Oxygen Not Included - Rocket Calculator v2025.12.22

Standalone version of the Oni Assistant tool. Pick an engine, cargo and target distance to see the fuel, oxidizer and mass impacts.

Select engine

Extra modules

Cargo Bays
Cargo bay
Research / Sightseeing
Research module
Solid Boosters
Solid booster
Fuel required (click fields above to adjust)
Other modules (auto-optimized, but editable)
Fuel Tanks
Fuel tank
Oxidizer Tanks
Oxidizer tank
Command Modules
Command module

Ship stats

Achievable distance vs. fuel

Notes on the fuel numbers

The calculator uses in-game values for tank capacities, oxidizer bonuses and weight penalties. Adding cargo, research or boosters makes the distance curve fall off quickly, so smaller rockets with fewer modules tend to be more efficient.

Steam engines are simple: they carry built-in water tanks and need no oxidizer, but they top out quickly. Petroleum rockets reach further but need balanced fuel and oxidizer storage. Hydrogen rockets remain the lightest option and benefit the most from LOX.

The solid booster adds a burst of distance but also extra wet mass. Try toggling boosters on a heavy rocket to see when it stops paying off.