Expeditioneers · Train

How fit are you, really?

VO₂ max — the maximum volume of oxygen your body can use, per kilogram, per minute — is the single best sea-level predictor of how comfortably you'll handle the daily ascent profile on Kilimanjaro. Put in a recent honest number below; we'll estimate yours, show you where you stand against population averages, and tell you plainly what it means for the route you're considering.

Three ways to estimate it. Pick whichever you have a real number for. A recent 5km race time is the easiest — most fitness-aware adults can give one without going for a test run. Cooper test and beep test are equally valid if you've done either recently.

One important honesty check. These formulas assume a hard, recent effort — a race or time-trial pace, not a casual jog. If you put in a casual number, the estimate will under-read your real VO₂ max. Be honest with yourself.

Estimate your VO₂ max

Choose an input method; fill in the fields; hit Estimate.
Used for population-percentile context. Must be 17+.
VO₂ max norms differ significantly by sex.
Optional: add weight, height, body fat for personalised what-if
Used to compute absolute VO₂ max in L/min and the what-if calculation.
Used to compute BMI and target weights for the what-if.
If known. Tempers the what-if for muscular climbers — high BMI with low body fat is mostly muscle, not a weight-loss problem.
:
A hard recent 5 km — race, parkrun, or honest time-trial. Not a casual jog.
Maximal effort over exactly 12 minutes on a flat track. The classic Cooper test.
The 20-metre multi-stage fitness test (Léger). Used in school PE, army selection, and team sport conditioning.
Your estimated VO₂ max
—ml/kg/min
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Where you stand

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10th 25th 50th 75th 90th 99th

What it means for Kilimanjaro

Thresholds adjusted for your age and sex — same percentile, different number.

Standard ascent (7–8 day)

Threshold: — ml/kg/min

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Compressed schedule (6-day TK Rongai or 5-day)

Threshold: — ml/kg/min

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Speed climb / running ascent

Threshold: — ml/kg/min

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Important honest caveats

  • VO₂ max predicts performance above 5,000 m poorly. Up high, what matters more is acclimatisation, hydration, and the absence of HAPE/HACE — not your sea-level fitness. Don't assume "I'm fit, I'll be fine."
  • These estimates carry a ±4 ml/kg/min uncertainty band. The range shown above is honest; the three input methods can produce moderately different numbers for the same person. A single decimal-precise figure would be false confidence.
  • Power-to-weight matters as much as VO₂ max. A heavier climber with the same VO₂ max moves a larger absolute load uphill. If you're carrying extra weight, losing it helps as much as training does.
  • The TK thresholds above are rules of thumb from our experience, not laboratory cut-offs. Plenty of people with "amber" numbers summit; some with "green" numbers don't. Acclimatisation and willingness to turn back matter more than any single number.