Calculate calories burned during indoor bouldering from body weight, session length, and effort, with quick or active/rest session modes.
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Indoor Bouldering Calorie Formula
The calculator uses the standard MET equation for energy expenditure.
kcal = MET × 3.5 × weight_kg ÷ 200 × minutes
- MET: metabolic equivalent for the activity (1 MET = resting)
- weight_kg: body weight in kilograms (1 lb = 0.4536 kg)
- minutes: duration of the activity
Quick mode applies one MET value to the whole session. Active/rest mode splits the session into two parts and adds them:
kcal_total = kcal_active + kcal_rest kcal_rest uses MET = 1.5
The "active calories above rest" figure subtracts 1 MET from each segment so you see the burn beyond what you would have spent sitting. Numbers are estimates; real burn varies with grade, style, hangboarding, and body composition.
MET Values and Typical Burn Rates
Bouldering does not have a single MET value in the Compendium of Physical Activities. The numbers below come from rock climbing entries and are scaled for the rest-heavy nature of indoor bouldering.
| Session type | Whole-session MET | On-wall MET |
|---|---|---|
| Easy/social | 4.0 | 7.0 |
| Moderate | 5.8 | 8.5 |
| Hard projecting | 7.5 | 10.0 |
| Resting between attempts | — | 1.5 |
Expected burn for a 60-minute session at moderate effort:
| Body weight | Easy (4.0 MET) | Moderate (5.8 MET) | Hard (7.5 MET) |
|---|---|---|---|
| 130 lb (59 kg) | 248 | 359 | 464 |
| 160 lb (73 kg) | 305 | 442 | 571 |
| 190 lb (86 kg) | 362 | 525 | 678 |
| 220 lb (100 kg) | 419 | 608 | 786 |
FAQ
Why is my watch's number higher? Wrist heart-rate trackers tend to overestimate climbing because forearm engagement and grip pumps spike heart rate without proportional oxygen demand. The MET method is conservative but closer to lab measurements for intermittent climbing.
Quick mode or active/rest mode? Use quick mode if you only know your gym time. Use active/rest if you actually timed yourself on the wall. A typical bouldering session is 15 to 25 minutes of real climbing inside a 60 to 90 minute visit.
Should I use gross or net calories? If you are tracking food intake against an exercise allowance, use net (active calories above rest) so you do not double-count your basal metabolism. For general curiosity, gross is fine.
Does grade matter? Yes, but not as much as time on the wall. Picking the "hard projecting" effort matters more if you are limit bouldering, where attempts are short and intense with long rests; the on-wall MET goes up but active minutes drop.
