What Is VAM in Cycling? VAM Calculator & Benchmarks

What is VAM?

VAM (m/hour) = elevation_gain_m × 60 / time_minutes

VAM was popularised by Dr. Michele Ferrari as a way to compare climbing performance across different climbs and different body weights — making it the closest thing to a universal climbing benchmark.

VAM Benchmarks

VAM, W/kg and Gradient Efficiency

VAM and W/kg are related, but not by a single constant. The part that *is* exact is gravity: lifting mass at a given vertical speed costs

W/kg from gravity = 9.81 × VAM / 3600

So 1,800 m/h is 4.9 W/kg of pure climbing against gravity, whatever the gradient. What changes with gradient is everything else. On a steep climb you are moving slowly, so rolling resistance and air drag are small and gravity accounts for ~93% of your power; on a shallow climb at the same VAM you must travel much faster, and drag — which rises with the cube of speed — takes a far larger share.

That is why VAM alone doesn't isolate climbing ability. For a 70 kg rider on a 9 kg bike, the same 1,200 m/h costs about 4.1 W/kg at 10% but 5.9 W/kg at 4% — a 44% difference in power for an identical rate of climbing — because the shallow version has to be ridden 2.5× faster (30 km/h against 12 km/h). Gravity's share of total power falls from 93% to 64% across that span. The calculator above resolves this by computing all three resistances rather than applying a gradient factor; a single-constant shortcut is only accurate near the gradient it was fitted to.

The Power Behind the Climb

The full power model for climbing:

P = M × g × V × sin(θ) + M × g × Crr × V + 0.5 × ρ × CdA × V³

At typical climbing speeds (12–20 km/h), aerodynamic drag is minimal. The equation simplifies to:

P ≈ M × g × V × sin(θ) + M × g × Crr × V

At 8% gradient** climbing at 15 km/h, gravity accounts for ~90% of total power. This is why body weight matters so much: every kilogram above your lean climbing weight costs you approximately **8–12 VAM per kilogram.

Weight vs. Power: The Climber's Dilemma

Iconic HC Climbs Reference

Frequently Asked Questions About VAM

What does VAM stand for in cycling? VAM stands for *Velocità Ascensionale Media* — Italian for "mean ascent velocity." It is expressed in metres per hour (m/h) and describes how fast a rider gains elevation, independent of the specific gradient or climb length. It was developed by Italian sports doctor Michele Ferrari as a gradient-neutral climbing benchmark.

What is a good VAM for a cyclist? For recreational riders: 700–900 m/h is typical. Trained club riders reach 900–1,100 m/h. A VAM above 1,300 m/h indicates competitive regional or national-level climbing ability. WorldTour professionals sustain 1,700–1,900 m/h on HC climbs; values above 1,900 m/h on sustained gradients are associated with historically exceptional performances.

How is VAM different from W/kg? W/kg measures raw power-to-weight ratio at any moment. VAM measures the *output* of that power on a specific gradient. Two riders with the same W/kg on different gradients will have different VAMs. VAM is more useful for comparing actual climb times; W/kg is more useful for comparing physiological capacity across contexts.

Can you improve VAM without gaining fitness? Yes — within limits. Losing body weight (without power loss) directly increases VAM. At 8% gradient, losing 1 kg typically adds 10–15 m/h VAM without any change in fitness. Tyre pressure and wheel weight have smaller but real effects. True VAM improvement over 100+ m/h requires sustained FTP gains.