Estimate calories burned bouldering from your body weight and session length, or from time actually climbing versus resting, with calories per hour.
Indoor Bouldering Calorie Formula
Indoor bouldering alternates short climbing attempts with longer periods of rest, observation, and route reading. This calculator therefore offers two distinct methods: a quick whole-session estimate or a measured split between active climbing and the remaining gym time.
quick gross kcal = session MET × body weight in kg × total hours split gross kcal = active MET × kg × active hours + 1.5 × kg × rest hours above-rest kcal = gross kcal - 1.0 × kg × total hours
The quick method applies one blended MET value to the entire visit. The split method applies the selected on-wall MET only to measured active time and assigns the rest of the gym visit 1.5 MET. The large result is gross energy; the table separately reports energy above the one-MET resting baseline.
Effort Options
| Method | Option | MET | Interpretation |
|---|---|---|---|
| Quick session | Easy or social | 4.0 | Whole visit with substantial rest |
| Quick session | Moderate | 5.8 | Blended indoor bouldering session |
| Quick session | Hard or projecting | 7.5 | Higher-intensity blended session |
| Measured split | Easy problems | 7.0 | Active on-wall minutes only |
| Measured split | Moderate problems | 8.5 | Active on-wall minutes only |
| Measured split | Hard limit attempts | 10.0 | Active on-wall minutes only |
| Measured split | Remaining gym time | 1.5 | Rest, observation, and low movement |
Choose the quick method when only total gym time is available. Choose the measured split when you timed actual climbing attempts or can make a defensible estimate of them. Active time cannot exceed total gym time, and both values must use the units shown beside their inputs.
Worked Examples
For a 70 kg climber in a 60-minute moderate quick session, gross energy is 5.8 × 70 × 1 = 406 kcal. Above-rest energy is (5.8 – 1) × 70 × 1 = 336 kcal.
For a 70 kg climber who spends 15 minutes actively climbing at 8.5 MET during a 60-minute visit, active gross energy is 8.5 × 70 × 0.25 = 148.8 kcal. The remaining 45 minutes at 1.5 MET adds 78.8 kcal, for 227.5 gross kcal. The above-rest estimate is 157.5 kcal.
How This Differs from the Rock Climbing Tool
This page is designed around an intermittent indoor gym visit. It does not model rope styles, lead climbing, route vertical distance, or target active time. Those belong to the broader rock-climbing energy workflow in the related section.
Limits of the Estimate
The selected MET is a reference value, not a personal measurement. Wall angle, attempt length, movement efficiency, rest behavior, body composition, and temperature can change actual energy use. Use the estimate for comparison and planning rather than as a precise nutrition prescription.
Frequently Asked Questions
Does total gym time equal active climbing time?
Usually not. If you enter the measured split, actual attempt time should exclude sitting, watching, brushing holds, and long pauses between attempts.
Which result matches a fitness tracker?
Many trackers report gross energy, but implementations vary. The calculator labels both gross and above-rest values so you can compare like with like.
Sources
- Ainsworth and colleagues — 2011 Compendium of Physical Activities, second update of codes and MET values.
