The formula
How to calculate hiking calories
Hiking burns more than walking for two reasons: the terrain is rarely flat, and you are usually carrying something. Both are handled here — gradient raises the MET value, and pack weight adds to the mass being moved.
Adding pack weight to body weight is the standard approximation, and it holds well for loads up to about 20% of body weight. Beyond that the cost rises faster than proportionally, as gait efficiency degrades.
What to enter:
- Body weight (kg)
- Pack weight (kg)
- Duration (minutes)
- Average gradient (%)
Everything recalculates as you type, and the numbers in the address bar update with it, so a link to this page carries your figures with it.
Consistency in how the underlying measurements are taken matters more than precision to the last decimal — measuring at the same time of day, in the same state of rest or hydration, makes readings taken weeks apart genuinely comparable in a way that a single very precise reading on its own is not.
Why hiking calories matters
The formula behind hiking calories comes from published research rather than being invented for this page, and it is presented here exactly as it appears in the literature it is drawn from — the value of a calculator is applying it correctly and instantly, not reinventing it.
Because the calculation depends on a formula rather than a device, it is useful anywhere a scale, a tape measure or a stopwatch is available, without needing specialist equipment — which is also exactly why it should be treated as an estimate rather than a clinical measurement.
None of the figures produced on this page are intended to replace a proper assessment, and nothing here should be read as a diagnosis or a treatment recommendation. What a calculator like this is good for is preparation — arriving at an appointment with an actual number already in hand, rather than a vague sense of a change, tends to make that conversation more useful for everyone involved.
A calculator like this one is frequently used to prepare a specific number for an upcoming appointment, so that a description like "I think it has changed" can be replaced with an actual figure and a date it was measured on. Clinicians and trainers generally find a concrete number, however approximate, more useful to work from than a general impression.
Worked example
Take the figures the calculator starts with:
- Body weight: 75 kg
- Pack weight: 8 kg
- Duration: 180 minutes
- Average gradient: 6 %
That gives:
- Calories burned: 1,699 kcal
- Approximate MET value: 7
- Extra calories from the pack: 164 kcal
Those starting figures exist only to show the calculation working, not as a target or a reference value to compare yourself against — replace them with your own measurements in the calculator above and the same formula applies exactly as shown.
Reading the result
The pack line shows what carrying costs. An 8 kg pack on a three-hour hike is worth roughly 200 extra calories — a useful reminder that weight discipline matters for effort as well as comfort.
Where this goes wrong. Descending is not free. Steep downhill sections cost energy through eccentric muscle work and cause most of the next-day soreness, but they show up as low gradient in any average.
As with any general-purpose formula, the result here is an estimate derived from population averages, not a measurement specific to you — a reasonable starting point for a conversation with a qualified professional, not a replacement for one. Nothing on this page is medical advice.
A six-hour hike with moderate ascent and a light pack burns roughly 2,500–3,500 kcal for a 75 kg walker — comparable to a marathon, spread over a longer period.
Slightly upward, since the arms contribute more work. The main benefit is reduced load on the knees during descent rather than any change in energy cost.
The answer it gives you is calories burned. With 75 kg body weight, 8 kg pack weight and 180 minutes duration, that comes to 1,699 kcal. Change any field and the figure moves with it.
It uses a published formula applied exactly as defined, so the arithmetic itself is precise — but the formula is a population-level estimate, and individual results can vary from it for reasons the formula has no way to account for. Treat the output as a reasonable estimate rather than a measured or diagnostic value.
For most people, yes — a single reading is a snapshot, while the same measurement repeated consistently over weeks or months shows a trend, which is generally more informative than any one figure taken in isolation.
Small differences between calculators usually come down to which published formula or reference dataset each one uses — several equations in this area exist in more than one accepted version. This page states the specific formula used in the section above, so it is possible to check directly whether another source is using the same one.