DELTA-SIERRA MARS TOOL
Oxygen demand calculator
Keep metabolic load, duration, and storage margin separate.
Essential answer
Total oxygen demand is a human metabolic rate multiplied by crew size and duration, optionally with a margin. The selected rate must always be tied to a metabolic profile.
Every value is editable. Scenario values are not an official NASA architecture.
Calculator
Method and limitations
The NASA value of 0.82 kg O₂/person/day corresponds to the standard mission day with exercise shown in OCHMO-TB-004. A different activity profile produces a different load.
Primary sources and evidence status
The calculation distinguishes physical relation, demonstrated value, standard, educational assumption, and Delta-Sierra scenario.
- NASA OCHMO-TB-004 — Carbon Dioxide / crew metabolic loads
Current NASA technical brief lists 0.82 kg O₂ per crewmember per standard mission day with exercise; mission design must use the applicable metabolic profile.
Sources and further reading
Downloadable scenario data
Dataset v1.1 documents every prefilled value: unit, system boundary, time basis, evidence status, and source when one exists.
Entry, descent and landing (EDL)
- Mars entry, descent and landing: understanding the full EDL chain
- Mars atmospheric entry: heat shield, entry corridor and guidance
- Mars parachutes and supersonic retropropulsion: where architecture changes
- Terrain-relative navigation, hazards and Mars landing-site selection
- Terminal descent, engine plumes and the Mars landing zone
- Human Mars lander: the EDL problem above 20 tonnes
Survive: ECLSS, health and resilience
- Mars habitat ECLSS: complete architecture of survival loops
- Mars habitat air: oxygen, CO₂, humidity and contaminants
- Mars water: 98% recovery, storage, quality and make-up
- Fire, depressurization and refuge: surviving habitat emergencies
- Mars radiation: shielding, dose and storm shelter
- Spacesuits, EVA and dust: working outside without contaminating the base
- Food, crops and medicine: biological and medical autonomy on Mars
- Psychology, fatigue and multiple failures: human resilience of a Mars base
Operations, industry, reliability and team
- Choosing a site and deploying a Mars base
- Mars surface mobility, robotics and logistics
- Mars ISRU industry, construction and local manufacturing
- Reliability, redundancy and common causes in a Mars base
- Durability, tightness, electronics and FDIR on Mars
- Mars maintenance, spares, qualification and configuration
- Crew operations, procedures and Earth-Mars communications
- Human factors, anomalies and training for a Mars team