Altitude Acclimatization Planner Calculator
Enter your current sleeping elevation, target sleeping elevation, and number of nights available. The calculator returns the minimum guideline itinerary, checks your time budget, and shows a night-by-night sleeping-elevation ceiling.
Minimum recommended itinerary7
- Available-time check
- Meets the guideline minimum with 0 nights to spare.
- Highest guideline-compliant sleeping altitude (ft)
- 15,584
- Required ascent nights
- 4
- Acclimatization nights
- 3
Night-by-night sleeping-elevation plan
| Night | Sleeping elevation (ft) | Purpose |
|---|---|---|
| 1 | 9,022 | Initial staging |
| 2 | 9,022 | Initial staging |
| 3 | 10,663 | Controlled ascent |
| 4 | 12,303 | Controlled ascent |
| 5 | 12,303 | Acclimatization night |
| 6 | 13,944 | Controlled ascent |
| 7 | 14,000 | Reach target |
Elevations are sleeping-elevation ceilings; daytime high points are not modeled.
The schedule assumes the starting sleeping elevation is already acclimatized.
Initial staging is applied because the trip starts below 2,750 m and sleeps higher.
How to use this calculator
- Choose feet or meters, then enter the elevation where you are already sleeping and acclimatized.
- Enter the highest place where you plan to sleep, not the highest pass, summit, or daytime stop.
- Enter the number of nights available before or at that target.
- Choose the nightly sleeping-elevation gain limit and whether to stage for 2 or 3 nights when starting low.
How the itinerary is calculated
This planner follows the sleeping-elevation approach used in high-altitude travel guidance. The important altitude is where you sleep, because overnight exposure gives the body less oxygen for many continuous hours. A high daytime point can still matter for symptoms and effort, but it is not the value controlled by this schedule.
All elevations are converted to meters first. Let S be the starting sleeping elevation, T the target sleeping elevation, A the available nights, R the selected nightly gain limit, and P the selected staging nights. If S < 2,750 and T > 2,750, the plan uses a staging base B = 2,750 and initial staging nights E = P. Otherwise B = S and E = 0.
The controlled gain is G = max(0, T - B). Required ascent nights are M = ceil(G / R). Extra acclimatization nights are Q = floor(G / 1,000), which inserts a repeated sleeping elevation after each full 1,000 meters of controlled gain. The minimum recommended itinerary is N = E + M + Q, and the time shortfall is max(0, N - A).
Why the plan sometimes repeats a night
A repeated elevation is not wasted time in this model. It is the planned pause that keeps the sleeping-elevation profile inside the selected gain limit while giving the body another night at roughly the same oxygen pressure. If the target is reached exactly at a 1,000-meter threshold, the extra night appears at the target.
Highest altitude from the available nights
The calculator also reverses the procedure. Starting at the staging base after any required staging nights, it spends each remaining night either increasing by no more than R or holding when another full 1,000-meter gain needs an acclimatization night. That produces the highest sleeping elevation the entered night budget can support under the same rule. This number may be higher than your target when you have more nights than the target needs.
What this calculator leaves out
The result is a planning ceiling, not a medical clearance or route recommendation. It does not model prior altitude exposure, previous altitude illness, exertion, alcohol, illness, medications, pregnancy, heart or lung disease, weather, remoteness, evacuation options, or the practical availability of camps and lodging. Symptoms override the schedule: worsening symptoms mean do not ascend, and severe symptoms require urgent descent and medical care.
Worked example
Suppose a traveler is sleeping at 5,000 ft and wants to sleep as high as 14,000 ft, with 7 nights available, a 500 m nightly gain limit, and 2 staging nights. The starting elevation is about 1,524 m, so the trip triggers staging at 2,750 m. The controlled gain from 2,750 m to 14,000 ft is about 1,517 m.
The ascent needs ceil(1,517 / 500) = 4 nights, and the extra acclimatization count is floor(1,517 / 1,000) = 1. The minimum itinerary is 2 + 4 + 1 = 7 nights, so the entered time meets the guideline. Reversing the same 7-night budget gives a highest guideline-compliant sleeping altitude of about 15,584 ft, while the target-specific table caps the final night at 14,000 ft.
Common questions
Why does sleeping elevation matter more than the highest point of the day?
Guidelines usually control the altitude where you sleep because that is the longest continuous exposure. You may climb or drive higher during the day and return lower to sleep, which is the idea behind climb high, sleep low. This calculator does not judge the risk of the daytime high point or the exertion needed to reach it.
How many days does it take to acclimatize to high altitude?
There is no single number for every traveler or route. In this planner, the minimum depends on the starting sleeping elevation, target sleeping elevation, staging requirement, nightly gain limit, and one extra night for each full 1,000 meters of controlled gain. People with symptoms or prior altitude illness may need a slower plan.
Does flying directly to Cusco, La Paz, or Lhasa change the calculation?
A direct flight can put you above the staging threshold before you have gradually ascended. If you start below 2,750 m and plan to sleep above it, this calculator inserts the selected 2 or 3 staging nights around 2,750 m before counting higher ascent. A real itinerary may need medical advice and local lodging choices that are not represented here.
What if I already spent time at altitude recently?
Recent altitude exposure can improve acclimatization, but the amount retained varies by person and by how high and how recently you slept. The calculator assumes the starting sleeping elevation is the altitude where you are currently acclimatized. If that is not true, use a more conservative starting point.
What should I do if altitude-illness symptoms develop?
Do not keep ascending with worsening symptoms, even if the schedule says the next night is allowed. Confusion, poor coordination, breathlessness at rest, or severe deterioration needs urgent descent and medical assistance. The calculator is not a symptom checker or treatment plan.