Incline treadmills

Short answer Incline is the single feature most worth paying for on a home treadmill, and the most commonly reduced to a marketing tick-box. A machine that can hit 12% has a genuinely different training capability from one that manages 3%, and the number alone does not tell you whether it adjusts automatically, holds under load, or has to be set with a manual pin before you start.

Jump to the machines

Working out what a given incline comes to, the incline calculator converts percent to degrees and height climbed, and the 12-3-30 calculator covers the workout that put 12% in front of everybody.

What incline percentage actually means

A 1% incline raises the deck 1cm over every 100cm of length. In degrees that is 0.57°, and the incline calculator converts any figure and shows what each grade does to the energy cost of the same walk.

Where the advice to "set 1%" comes from, and why we do not repeat it. It traces to one study, Jones and Doust in 1996, which found a 1% grade matched the energy cost of running the same speed outdoors. It found that between 2.92 and 5.0 metres a second, which is 10.5 to 18.0 km/h, in nine trained male runners. Below that range the study says nothing, so neither do we. The reason it gives is air resistance. DPublisher stated, Independent publication, checked 19 Sept 2026

How high machines actually go, counted from our own records rather than asserted. Of the 18 treadmills we hold records for, 13 publish a maximum incline and 5 of those go above 10%. 5 publish no incline figure at all, which is not the same as having none. The table below is every one of them, at the grade its own source states.

Motorised versus manual incline

Motorised incline adjusts from the console while you are moving, which is the entire point of training with it — you can raise or lower it mid-session without breaking stride. Manual incline means stopping the belt, lifting and repositioning a pin, and starting again. In practice a manual incline gets set once and left there, which is a materially different feature from what the spec sheet implies.

Maximum incline on the machines we have sourced

None of these figures distinguishes motorised from manual adjustment in the source we recorded them from — check the individual product page before assuming.

Why incline walking has become the standard recommendation

Raising incline at walking speed increases effort substantially without the impact of running, which is why it is now widely recommended for people who want a harder workout without the joint load of running. We are not going to attach a calorie or fitness claim to that beyond the mechanical fact that walking uphill costs more energy than walking flat — the exact amount depends on your weight, speed and the incline itself. Our calorie calculator does not currently adjust for incline, and we would rather say that plainly than publish an unverified adjustment factor.ENot established, checked 19 Sept 2026

What we have not established

We have not measured how any of these inclines feel in practice, how reliably the motorised ones hold under load over years of use, or whether the stated maximum is achievable with the deck at full length. How we review.

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