Altitude Sickness Risk Calculator
Assess Altitude Risk
Calculate your altitude sickness risk level
ft
ft
Acclimatization Schedule
Plan acclimatization stops for high altitude
Formula
Risk Score based on: target elevation (1-5 pts) + ascent rate (0-3 pts) + experience modifier (-1 to +2 pts). Scale: 0-3 Low, 4-5 Moderate, 6-7 High, 8+ Very High.
Frequently Asked Questions
At what altitude does altitude sickness start?
Altitude sickness can begin above 8,000 feet (2,438 m), though it's more common above 10,000 feet (3,048 m). About 25% of people experience symptoms at 8,000 ft, 50% at 14,000 ft, and nearly everyone is affected above 18,000 ft without acclimatization.
What are the symptoms of altitude sickness?
Mild AMS symptoms include headache, nausea, dizziness, fatigue, and poor sleep. Severe symptoms include confusion, difficulty walking (ataxia), and shortness of breath at rest. HACE (brain swelling) and HAPE (fluid in lungs) are life-threatening and require immediate descent.
How can I prevent altitude sickness?
Ascend gradually (no more than 1,000 ft/day above 10,000 ft), take rest days every 3,000 ft gained, stay hydrated, avoid alcohol, eat carbohydrate-rich foods, and consider acetazolamide (Diamox) as a preventive medication. Never ignore symptoms.
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