Hiking and stairs:
what climbing really costs in calories

The cost of going up

Walking on the flat at 5.6 km/h costs a 70 kg person about 301 kcal an hour. Hike a hilly trail and the figure rises to about 420 kcal an hour, and a fast pace on the stairs reaches about 616 kcal an hour. The difference is gravity: climbing means lifting your whole body weight against it, and that takes work that level walking does not.

Stair climbing is one of the most energy-dense everyday activities, which is why a brisk 10 minutes counts for so much. Hiking falls between walking and stairs, with the exact value depending on gradient, pack weight and terrain.

Below you will find the MET values for both, a worked example of a day hike, and a second method that uses climb height. Together they cross-check each other.

The MET formula and typical values

Worked example: a three-hour hike

A 70 kg hiker walks a hill trail for three hours of moving time, at the cross-country hiking rate of 6.0 MET. Breaks for food and photos are not counted.

That is roughly two large meals of energy, and it is why long hikes call for real food and water. The estimate is wide: steep scrambling or poor footing can push the true value beyond the table, and a flat forest track can bring it below.

Cross-checking with climb height

Physics gives a second view. Lifting a mass m through a height h takes work equal to m × g × h. The body turns food energy into mechanical work with an efficiency of around 25%, so the energy cost is about four times the work.

For a 70 kg person climbing 100 m: 70 × 9.81 × 100 = 68,670 J of work. Divide by 0.25 for 274,680 J of energy, then by 4,184 for about 66 kcal. A 600 m ascent therefore costs about 394 kcal in climbing alone, a large part of the 1,050 kcal net figure for the day hike above.

Stair climbing in daily life

Stairs are available everywhere, which makes them a practical workout. At 8.8 MET, 10 minutes of fast stair climbing burns 8.8 × 70 × (10 ÷ 60) ≈ 103 kcal for a 70 kg person. At a slow 4.0 MET the same 10 minutes is about 47 kcal.

Height gives another check. A typical floor is about 3 m, so 20 floors gains roughly 60 m: 70 × 9.81 × 60 = 41,202 J, or about 39 kcal using the 25% efficiency figure. That is the climb only; with the pace, the MET approach is a better guide to a session.

• Take the stairs for one or two floors rather than the lift; the daily total builds up over weeks.
• Hold the rail lightly, and do not lean forward at the waist.
• Climb at a pace that lets you breathe through the nose for the first minutes.
• Descending is easier on the heart but harder on the knees, so take it carefully.

Planning time and fuel for a hike

Naismith's rule is a traditional way to plan hill walks: allow one hour for every 5 km of distance, plus one hour for every 600 m of ascent. A 12 km route with 600 m of climbing is 12 ÷ 5 + 1 = 3.4 hours of moving time. At 6.0 MET and 70 kg that is 6.0 × 70 × 3.4 = 1,428 kcal gross.

Fuel matters on a day like that. Pack food that is easy to eat on the move, such as nuts, fruit, bread or energy bars, and a little more than you think you need. Many hikers aim for a snack every hour or so rather than one large stop, which helps keep energy even and avoids a late slump.

Water needs depend heavily on heat and effort. A common planning figure is about 500 ml an hour for moderate effort in mild weather, with more in heat or at altitude. Carry enough for the whole route, plus a reserve, and know where you can refill.

• Start early so that you finish with daylight to spare.
• Check the weather and tell someone your route and return time.
• Take layers, since temperature drops with height.
• Turn back if conditions change, regardless of the calorie target.

Limits of the estimate and safety

MET values assume an average adult on an average trail. Altitude raises heart rate and breathing without a matching rise in work, so a watch may overshoot above 2,500 m. A heavy pack adds directly to the mass in the climb formula. Wet ground, loose scree and snow add cost beyond any table.

• Add pack weight to body weight in both methods.
• Count moving time only, since long rests would otherwise inflate the total.
• Carry more water and food than the number suggests, particularly in heat.
• Check the weather, daylight and your route before setting off.

People with heart or lung conditions, or knee and hip problems, should speak to a clinician about hiking and stair training, and build the load gradually.