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Fellrise Wilderness & Expedition Basecamp
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Interactive Hypsometric Lab

Elevation Profile Lab

Scrub any trail's elevation profile, watch altitude and estimated oxygen availability update in real time, and compare trek-time estimates across three named pace corrections.

Distance
Altitude
Est. O₂ availability
Trek time
Active waypoint

The math behind this

Oxygen availability uses the real barometric-formula approximation of atmospheric pressure decay with altitude (an atmospheric scale height of ~7800m) — it estimates the relative partial pressure of oxygen at altitude, not blood oxygen saturation, which depends on acclimatisation and individual physiology. Trek-time estimates start from Naismith's Rule (5km/h + 1 hour per 600m of ascent) with simplified approximations of Tranter's correction tables for moderate fitness and for a laden/winter pace — treat all three as planning estimates, not guarantees.