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Mountain Elevation Calculator

Assess an ascent profile and the effect of altitude on performance.

About Mountain Elevation Calculator

Aerobic capacity falls about six per cent per thousand metres above 1,500, so ascent rates slow with height even on easier terrain. Oxygen availability follows the barometric pressure curve rather than falling linearly. Underestimating the altitude penalty is why summit day routinely takes half again as long as the gradient alone suggests.

Formula

Mountain Elevation

Ascent time = elevation gain ÷ ascent rate, reduced by the altitude penalty

altitude penalty
Aerobic capacity falls roughly six per cent per 1,000 m above 1,500 m
oxygen availability
Partial pressure falls with the barometric pressure

Worked example

With the default values below, Mountain Elevation Calculator returns Estimated Ascent Time of 4.727. Change any input above and every figure here is recalculated in your browser.

Inputs used

Summit elevationaccepts 0–9,000 m
3,200 m
Trailhead elevationaccepts 0–9,000 m
1,400 m
Distance to the summitminimum 0.001 km
9 km
Ascent rate at low altitudeminimum 1 m/h
400 m/h

Results

Estimated Ascent Time
4.727 h
Total Elevation Gain
1,800 m
Average Gradient
20.00%
Oxygen Availability at the Summit
67.45%
Aerobic Performance Loss at the Summit
10.20%

Step by step

  1. 1Values used
  2. 2Mountain Elevation
  3. 3Estimated Ascent Time= 4.727 h
  4. 4Total Elevation Gain= 1,800 m
  5. 5Average Gradient= 20.00
  6. 6Oxygen Availability at the Summit= 67.45
  7. 7Aerobic Performance Loss at the Summit= 10.20

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is Mountain Elevation calculated?

Ascent time = elevation gain ÷ ascent rate, reduced by the altitude penalty Aerobic capacity falls about six per cent per thousand metres above 1,500, so ascent rates slow with height even on easier terrain. Oxygen availability follows the barometric pressure curve rather than falling linearly.

Why does Mountain Elevation matter?

Underestimating the altitude penalty is why summit day routinely takes half again as long as the gradient alone suggests.

What values do I need to enter?

This calculator takes 4 inputs: Summit elevation, Trailhead elevation, Distance to the summit, Ascent rate at low altitude. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.

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