Plan acclimatisation for a high-altitude ascent.
Acclimatisation is governed by sleeping altitude rather than the highest point reached, so gaining 400 metres of sleeping altitude a day is the accepted guidance above 3,000 metres. Rest days consolidate the adaptation. Altitude sickness is a function of ascent rate rather than fitness, which is why fit climbers who move fast are at higher risk than slower, less fit ones.
Altitude Adjustment
Days = altitude to gain ÷ safe daily gain, plus a rest day at the chosen interval
Days = altitude to gain ÷ safe daily gain, plus a rest day at the chosen interval Acclimatisation is governed by sleeping altitude rather than the highest point reached, so gaining 400 metres of sleeping altitude a day is the accepted guidance above 3,000 metres. Rest days consolidate the adaptation.
Altitude sickness is a function of ascent rate rather than fitness, which is why fit climbers who move fast are at higher risk than slower, less fit ones.
This calculator takes 5 inputs: Target altitude, Current altitude, Maximum daily sleeping altitude gain, Rest day every so many days, Previous high-altitude experience. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.