What does VAM stand for?

VAM is the Italian Velocità Ascensionale Media, meaning average ascent speed. It expresses how many vertical metres you climb per hour and was popularised by coach Michele Ferrari as a quick way to compare climbing efforts.

Recreational climbers manage 600-900 VAM, strong amateurs reach 1,000-1,400, and Grand Tour contenders can sustain 1,600-1,800 VAM on a steep summit finish. VAM falls on shallower gradients because gravity does less of the resistance.

Can VAM estimate my power-to-weight?

On steep climbs of 7% or more there is a rough proportionality: W/kg is approximately VAM divided by a gradient factor near 100. The estimate here uses that relationship and is most accurate on consistent, steep climbs with little wind or descending.

Why does gradient affect VAM?

On a gentle gradient more of your power goes into overcoming air and rolling resistance rather than lifting your mass, so even at the same wattage your vertical speed is lower. That is why VAM comparisons are fairest between climbs of similar steepness.

Does VAM account for my weight?

VAM itself is independent of rider weight — it only measures vertical speed. The power estimate, however, is expressed in watts per kilogram, which already normalises for weight and is the metric that decides climbing pace.

Cycling Elevation & VAM Calculator

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The pro climber’s speed metric

VAM — vertical ascent metres per hour — is how coaches and commentators compare climbing performances across different mountains. It strips a climb down to one number: how fast you gained altitude. This calculator takes the elevation gained and the time it took, returns your VAM, and uses the climb’s gradient to estimate the power-to-weight that produced it.

How it works

VAM is just vertical speed:

VAM = elevation_gain_m / (time_hours)

where time_hours = (minutes + seconds/60) / 60. To estimate power-to-weight the tool uses the well-known approximation valid for steep climbs:

W/kg  ≈  VAM / (100 + (gradient_percent - 10) * 2)

The denominator (a “gradient factor” near 100) shrinks on steep climbs and grows on shallow ones, capturing how much extra power is lost to air and rolling resistance at lower gradients. Gradient is derived from elevation gain and an estimated climb length when you provide one.

Example and tips

A climb gaining 1,000 m in 50 minutes gives 1000 / (50/60) = 1,200 VAM. On a steady 8% gradient that maps to roughly 1200 / 96 ≈ 5.0 W/kg. For the cleanest comparison, only time the actual climbing section, avoid climbs broken up by descents, and remember that a tailwind or draft can inflate VAM without extra effort.