Simulator · Oxygen, acclimatisation and the third night

Altitude Simulator

Enter where you sleep each night, or pick a place’s profile. The simulator computes the oxygen available at each altitude, checks every jump against the acclimatisation rules and gives a risk index for acute mountain sickness with the nights that need care.

Altitude is arithmetic before it is anything else. Air pressure falls with height, oxygen falls with it, and the body adapts at a rate that the mountaineering guidelines have measured for decades: sleep no more than 300 to 500 metres higher than the night before above 3,000 metres, and rest a day every 1,000. This simulator applies those rules to your itinerary and shows the night where they break.

Simulators

One place, one month, one calendarJourney SimulatorChoose a place, a month, the days you have and how you travel. The simulator lays out a day-by-day timeline with temperatures, daylight, sleeping altitude, effort and cost, and flags the days where the model gets nervous. Open

What the month does to the placeClimate SimulatorHighs, lows and rain days for all twelve months of any place, with a feels-like line, a clothing verdict and a side-by-side comparison of up to three places for the month you can travel. Open

Sunrise, sunset and the polar casesDaylight SimulatorAny latitude, any date: sunrise, sunset, day length, civil twilight and the golden hours, drawn as an arc. It knows about the midnight sun and the polar night, and it shows how fast the day changes around your dates. Open

The Simulation Brief

One place, one simulator, one honest number. Every second Sunday.

No newsletter theatre. A short e-mail with the place we modelled, what the model said and what the ground said back.