Altitude Sickness Risk Calculator
Estimate your altitude sickness risk by elevation using our free calculator. Whether you are hiking, skiing, or traveling to high-altitude cities, this tool evaluates Acute Mountain Sickness probability based on elevation gain, ascent speed, and personal factors.
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Understanding Altitude Sickness
Altitude sickness occurs when the body cannot get enough oxygen at high elevations. Symptoms range from mild headaches to life-threatening pulmonary or cerebral edema. Risk increases above 8,000 feet and rises sharply above 14,000 feet.
Acute Mountain Sickness (AMS)
AMS is the most common form. Symptoms include headache, nausea, dizziness, and fatigue. Most cases resolve with rest, hydration, and descent if needed. Our altitude sickness risk calculator by elevation flags moderate-to-high AMS probability so you can adjust plans.
High-Altitude Pulmonary Edema (HAPE)
HAPE is a severe lung condition caused by fluid buildup. Warning signs include shortness of breath at rest, coughing, and chest tightness. HAPE risk by elevation climbs rapidly above 14,000 feet, especially with rapid ascent.
High-Altitude Cerebral Edema (HACE)
HACE affects the brain and can be fatal without immediate descent. Symptoms include confusion, ataxia, and irrational behavior. HACE risk by elevation is highest during fast ascents to 18,000 feet and above.
Elevation Risk Zones
| Elevation Range | AMS Risk | HAPE / HACE Risk | Notes |
|---|---|---|---|
| Below 8,000 ft | Low | Very low | Most people tolerate this range well |
| 8,000 - 11,999 ft | Low to moderate | Low | Gradual ascent recommended |
| 12,000 - 14,999 ft | Moderate | Low to moderate | Watch for AMS symptoms |
| 15,000 - 17,999 ft | High | Moderate | Consider prophylactic medication |
| 18,000 - 21,999 ft | Very high | High | Only experienced mountaineers should attempt |
Key Risk Factors
- Ascent rate: Climbing faster than 1,000 feet per day increases risk significantly
- Previous altitude history: Prior AMS predicts future episodes
- Hydration: Dehydration worsens symptoms and impairs acclimatization
- Sleep altitude: Sleeping above 10,000 feet carries higher risk than daytime exposure
- Exertion intensity: Overexertion on day one amplifies altitude sickness risk by elevation
- Medications: Acetazolamide and dexamethasone can reduce risk when used prophylactically
Acclimatization Strategies
Use the climb-high, sleep-low approach. Spend two to three nights at base camp before pushing higher. Include rest days every 3,000 feet of gain. Hydrate aggressively, avoid alcohol, and descend immediately if symptoms worsen.
FAQ
What elevation causes altitude sickness?
Altitude sickness can occur above 8,000 feet, though most cases appear between 10,000 and 14,000 feet. Individual susceptibility varies widely, and rapid ascent increases risk even at moderate elevations.
How long does altitude sickness last?
Mild AMS typically resolves within 24 to 48 hours at the same altitude or after descending 1,000 to 2,000 feet. Severe cases require immediate descent and medical attention.
Can altitude sickness be prevented?
Altitude sickness can be partially prevented with gradual ascent, proper hydration, avoiding alcohol, and prophylactic medications such as acetazolamide. The altitude sickness risk calculator by elevation helps you plan safer itineraries.
Is altitude sickness dangerous at 10,000 feet?
At 10,000 feet, altitude sickness is usually mild and manageable, but it can become dangerous if symptoms are ignored. Rare fatalities occur near this elevation, mostly involving HAPE or HACE from rapid ascent.