About the Altitude Sickness Risk Calculator
Acute mountain sickness (AMS) can affect anyone traveling to high elevations — the Himalayas, Andes, Tibet plateau, or East African peaks. Symptoms include headache, nausea, dizziness, and fatigue. In severe cases, it can progress to life-threatening high-altitude pulmonary edema (HAPE) or cerebral edema (HACE). This tool calculates your risk level based on destination altitude and recommends appropriate acclimatization time and ascent rate.
Altitude Sickness Risk by Elevation
| Elevation | Risk | Likely Symptoms |
|---|---|---|
| Under 8,200 ft (2,500 m) | None | Negligible for most people |
| 8,200–11,500 ft (2,500–3,500 m) | Low | Mild headache in susceptible individuals |
| 11,500–14,800 ft (3,500–4,500 m) | Moderate | Headache, fatigue, disturbed sleep |
| 14,800–18,000 ft (4,500–5,500 m) | High | Nausea, shortness of breath, dizziness |
| Above 18,000 ft (5,500 m) | Very High | Severe symptoms, HAPE/HACE risk |
Frequently Asked Questions
Stop ascending immediately and rest. If symptoms do not improve within 24 hours or worsen at any point, descend to a lower altitude — this is the most effective treatment. Severe symptoms require immediate medical attention.
Arrive in Cusco (11,200 ft / 3,400 m) a day or two before visiting Machu Picchu. Rest on arrival day, drink plenty of water, and avoid alcohol. Coca tea is a traditional local remedy for mild symptoms.
Prior experience does not guarantee immunity. AMS susceptibility varies trip to trip. Gradual ascent remains the most reliable prevention strategy regardless of your history.