Altitude calculator
What does your mountain do to your oxygen?
Set your target altitude or pick a mountain. You immediately see the effective oxygen level, air pressure and altitude zone, plus what that means for your preparation.
13,123 ft
0 m9.000 m
Effective oxygen level
12.7%
Relative to sea level61%
Air pressure616hPa
Standard temperature-11°C
Comparable toYabuk Camp, Sikkim (~3,962 m)
Advice for this altitude
- Practical focus: start 4 to 5 weeks ahead, consistent sleep, recovery monitoring
- Pre-acclimatisation: strongly recommended for a safe ascent
- Goal: Mont Blanc, Elbrus and similar 4,000 to 5,000 m objectives
- Sleep regularly in the altitude tent (at least 3 to 4 times a week)
Typical symptoms: Persistent headache, nausea, restless sleep, faster exhaustion
Red flags: always descend and seek medical help: Inability to walk straight (ataxia), drowsiness or confusion, shortness of breath at rest
Altitude calculator
Oxygen per altitude
| Altitude | Oxygen | vs sea level |
|---|---|---|
| 0 m | 20.9% | 100% |
| 610 m | 19.4% | 93% |
| 1,219 m | 17.9% | 86% |
| 1,829 m | 16.6% | 79% |
| 2,438 m | 15.4% | 74% |
| 3,048 m | 14.3% | 68% |
| 3,658 m | 13.2% | 63% |
| 4,267 m | 12.3% | 59% |
| 4,877 m | 11.4% | 55% |
| 5,486 m | 10.5% | 50% |
| 6,096 m | 9.7% | 46% |
| 6,706 m | 9.0% | 43% |
| 7,315 m | 8.4% | 40% |
| 7,925 m | 7.8% | 37% |
| 8,534 m | 7.2% | 34% |
| 9,144 m | 6.3% | 30% |