Why watts per kilo decides everything on a climb, how to improve that number on purpose, and the technique that really saves you energy uphill.
Why do people drop me on climbs who are no faster than me on the flat? The honest answer: uphill it's not how many watts you push that counts, but how many watts per kilogram of body weight — your W/kg. On a climb you fight gravity, and it pulls on every kilo you drag up with you.
That's the hardest truth of climbing: a 60 kg rider at 240 watts (4.0 W/kg) climbs a steep hill faster than an 80 kg rider at 280 watts (3.5 W/kg) — even though the heavier one produces more absolute power. On the flat watts win, on the climb watts per kilo win.
For orientation: recreational riders sit roughly at 2–3 W/kg at threshold, ambitious amateurs at 3.5–4.5 W/kg, pros at 5.5–6.5+ — that's the gap between "I get up" and "I fly up". This guide shows you how to lift your number and ride smarter uphill.
Divide your threshold power (FTP in watts) by your weight in kilos. 250 W at 75 kg = 3.3 W/kg. That's your climbing metric. Only once you know it do you know which of the two levers — watts up or kilos down — is worth the work for you.
The most sustainable lever for most people is more power, not losing weight. Targeted threshold and VO2max intervals raise your FTP (more in the intervals guide). For recreational riders, every extra watt at threshold turns straight into speed uphill — and makes you stronger on the flat too. Worked example: raise your FTP from 225 to 250 watts at the same weight and your W/kg at 75 kg jumps from 3.0 to 3.3 — on a long climb that means real minutes.
The second lever is total weight — and that means body plus bike plus luggage. For most people, a little body fat is the cheapest "upgrade", far ahead of pricey lightweight parts. One kilo less on your belly costs nothing and works like one kilo less on the frame. But: never starve at the cost of strength and health.
Shift down early so you can hold 70–85 rpm on the climb instead of crawling in a big gear. Sit calm and efficient most of the time; stand only on steep pitches or to attack. Upper body loose, breathing even — panic breathing costs more than the climb itself.
Don't confuse W/kg with a command to lose weight at any cost. A recreational athlete dropping below a healthy weight risks losing strength, catching infections and disordered eating — you close the "gap upward" more healthily through more power. When in doubt, get medical advice.
And don't forget: every climb has a descent. Don't ride so deep into the red on the way up that you enter the descent shaky and unfocused — that's exactly where mistakes happen. Meter your effort so you're still in control going down.
Measure your time on a fixed local climb, not just your watts. A repeatable ascent is your most honest progress test: if you ride it faster month after month, your W/kg is rising — whatever the numbers say in detail. The climb never lies; it's your personal test bench. Always approach it the same way: same start point, similar fuelling, fresh legs — otherwise you're comparing apples and pears.
Rough orientation at threshold: recreational riders 2–3 W/kg, ambitious amateurs 3.5–4.5, pros 5.5–6.5+. More important than comparing with others is your own trend: if your number grows over the season, you climb faster — full stop.
On longer, steeper climbs W/kg is the most important factor, because gravity scales with total weight. On the flat and over short, flat rollers it's more about absolute power plus aerodynamics. For climbing, watts per kilo stays the king number.
For most recreational riders more power is the better and healthier lever. Losing some excess body fat helps on top, but radical starving costs strength. Build your FTP through intervals first, then optimise weight gently — never the other way round.
A little lower than on the flat, usually 70–85 rpm. Shift down early enough that the legs spin freely instead of crawling in a big gear. Too low a cadence overloads muscles and knees; too high leaves you bouncing in the saddle on steep pitches. On very steep ramps you may briefly stand and heave a bigger gear; as soon as it flattens, sit again and pick the cadence back up.
Testing FTP: Measure Your Threshold Power Honestly