Join the Waitlist
Join the Waitlist
The Summit Simulator from Train to Mountain is the free mountaineering readiness calculator. It runs the same Banister fitness-fatigue model that Train to Mountain members use, applied to the variables you enter: target altitude, training load, current fitness, and weeks to summit. Set your inputs, and watch the science calculate your readiness in real time. Train to Mountain members get this powered by their actual wearable data, training history, and a live Ridge AI agent.
This simulator works on your estimates. TTM works on your reality - wearable data, actual sessions completed, sleep scores - and re-plans your entire program every Sunday.
Training is never a straight line. Here's a real example of what happens when your ATL spikes after a big week - the same adaptive logic applies when you miss sessions or overperform. All measured by TSSiTraining Stress ScoreA weighted measure of how much a workout stressed your body. Combines intensity and duration. Higher TSS = more load on your system..
At sea level, most healthy athletes can sustain effort regardless of fitness differences. At 5,000m, everything changes. The limiting factor isn't strength, determination, or experience - it's your cardiovascular system's ability to deliver oxygen to working muscles as atmospheric pressure drops.
This simulator uses estimates. TTM uses your wearable, your training history, your actual physiology. Join early access and get a personalised program built by AI from day one.
Free during beta · No credit card · iOS first, Android following
A tool that estimates your cardiovascular readiness for a target altitude based on your training load, fitness trend, and weeks remaining. The Summit Readiness Simulator runs the Banister fitness-fatigue model on your inputs and returns a single readiness score against the objective you set.
The interactive simulator gives a directional estimate from the variables you enter. The full TTM mountaineering training app produces the calibrated score using your real wearable data - heart rate, training load, vertical, recent session history - which is materially more accurate than any single-input form. Treat the public simulator as a quick sense-check, not a verdict.
Target altitude, current weekly training volume, current fitness level (CTL or equivalent), and weeks remaining until the objective. The model uses these to estimate projected fitness on summit day and the cardiovascular reserve you should hold for altitude-corrected effort.
Because altitude is the variable that most consistently breaks summit attempts among aerobically fit athletes. Sea-level pace and time-on-feet matter; reserve at altitude matters more. The model corrects for the oxygen drop at your target elevation to surface the readiness gap that pure fitness numbers miss.
Yes. The public calculator is free, with no signup. The full TTM app runs the same readiness model on your wearable data, with weekly recalibration; that experience is part of the subscription.
The simulator surfaces the gap rather than promising you can close it. If projected readiness is well below the threshold for your altitude, the honest answer is usually one of: extend the timeline, drop the altitude target, or commit to a structured build that adds the missing fitness before the trip.