How much oxygen will you breathe at altitude?
The higher you climb, the less oxygen in every breath.
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The air you breathe, altitude by altitude
Oxygen available compared to sea level
Altitude Oxygen Calculator
From your location, or any altitude you choose.
Altitude Oxygen Calculator
You have ...% oxygen available
Check your oxygen availability and altitude now to move safely at high altitudes.
Alpine sport is a journey with body and mind, and it trains the soul for life.
Less pressure, less oxygen.
Air always contains 21% oxygen, but at altitude its density collapses. At 5,000 m you breathe less than half.
| Altitude | O₂ available | Typical SpO₂ |
|---|---|---|
| 500 m | 94% | 96–98% |
| 1.000 m | 88% | 95–97% |
| 2.000 m | 78% | 93–96% |
| 3.000 m | 69% | 88–93% |
| 4.000 m | 61% | 82–88% |
| 5.000 m | 53% | 74–82% |
| 8.848 m | 31% | 55–65% |
* Values for non-acclimatized individuals. Source: ISA Standard Atmosphere model.
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Read before you go
Acclimatization, safety, high-altitude physiology.
Health at Altitude
Altitude Sickness: Symptoms, Prevention and Treatment
Health at Altitude
HACE and HAPE: High Altitude Edema Symptoms & Treatment
Preparation
How to Prepare for Mont Blanc: Training Guide
The free high-altitude guide
38 pages, 60+ sources, practical checklist.
Made by people who go to altitude
Oxymeter was born on Monte Rosa, from a mountaineer who wanted to know how much air he would breathe at the summit.
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