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.
9,843 ft
0 m9.000 m
Effective oxygen level
14.4%
Relative to sea level69%
Air pressure701hPa
Standard temperature-4°C
Comparable toZugspitze, Germany (~2,962 m)
Advice for this altitude
- Practical focus: start 3 to 4 weeks ahead, extra hydration, practise with your gear
- Pre-acclimatisation: recommended for optimal preparation
- Preparation for high treks and alpine routes
- Start altitude-tent training
Typical symptoms: Increased breathing, poorer sleep, headache, reduced appetite
Red flags (always descend and seek medical help): Headache and increasing nausea, clear dizziness or unsteady walking
One breath
14 of the 21 oxygen molecules
OxygenNitrogenEach dot is 1% of a breath at sea level.
At 3,000 m the air is thinner: less oxygen and less nitrogen in every breath, in the same proportion.
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% |