Work out roughly how many calories and kilojoules floating down a river on an inflatable inner tube burns, based on your body weight and float time — and see why the honest answer is "barely more than sitting still."
River tubing — floating on an inflatable inner tube down a gentle current — carries a very low MET value of 2.3, only just above the 1.0 MET baseline for sitting quietly at rest. Calorie burn is estimated as calories = MET × body weight (kg) × float time (hours). A 75 kg person floating for 120 minutes (2 hours) burns roughly 345 kcal, about 1,443 kJ. Almost all of that modest energy cost comes from staying afloat and occasionally paddling or steering rather than any real physical effort — tubing is a relaxing, passive way to spend a hot afternoon on the water, not a workout.
| Float Length | Calories | Kilojoules |
|---|
The calculation multiplies three inputs together: a MET (Metabolic Equivalent of Task) value for river tubing, your body weight, and the time you actually spent floating. The Compendium of Physical Activities lists "tubing, floating on a river, general" with a MET value of 2.3, which the calculator multiplies by your weight in kilograms and your float time in hours to produce an estimated calorie figure, then converts that to kilojoules for Australian food-label comparison.
It's worth being very upfront about what a MET of 2.3 actually means. The MET scale starts at 1.0, which represents your resting metabolic rate — the energy your body burns simply sitting quietly and breathing. A MET of 2.3 is only a little over double that baseline, which places river tubing at the very bottom of the "light activity" band, well below a brisk walk (typically MET 3.5–5) and nowhere near activities that get your heart rate up. Sitting in an inflatable tube while a river current carries you downstream involves almost no sustained muscular effort — most of your body weight is supported by the water and the tube, and beyond the occasional paddle stroke to steer around an obstacle or nudge yourself back toward the group, there's very little for your muscles to do.
River tubing is genuinely enjoyable as a low-key summer pastime — floating with friends or family, chatting, soaking up the scenery, and cooling off on a hot day. But it would be dishonest to present it as a meaningful workout just because it happens outdoors on the water. This page won't oversell the numbers: at MET 2.3, tubing burns barely more than lounging around at home, and it should be enjoyed for what it is — a relaxing way to spend an afternoon — rather than counted toward your exercise for the day.
River tubing is a familiar warm-weather activity around many parts of Australia, wherever there's a stretch of calm-flowing river or a popular swimming hole with a gentle current. It happens informally on rivers such as the Murray River, in the Yarra River region, and at countless other swimming holes and slow-moving waterways around the country, usually as a casual group activity rather than an organised sport — people bring their own inflatable tubes, float a section of river, and either walk or drive back to their starting point afterwards. There's no reliable way to say how popular tubing is nationwide or how many people take part each summer, so this page won't guess at participation numbers — it's simply described honestly as a relaxed, informal way for Australians to spend time on the water during warmer months.
This table holds float length constant at 120 minutes (2 hours), so you can see how much body weight alone changes the total.
| Body Weight | MET | Calories (120 min) | Kilojoules |
|---|---|---|---|
| 60 kg | 2.3 | 276 kcal | 1,155 kJ |
| 70 kg | 2.3 | 322 kcal | 1,347 kJ |
| 75 kg | 2.3 | 345 kcal | 1,443 kJ |
| 80 kg | 2.3 | 368 kcal | 1,540 kJ |
| 90 kg | 2.3 | 414 kcal | 1,732 kJ |
| 100 kg | 2.3 | 460 kcal | 1,925 kJ |
Because body weight is a straight multiplier in the formula, a 100 kg person burns roughly two-thirds more than a 60 kg person over the identical two-hour float — but even at the top of that range, the totals remain modest compared with almost any activity that involves actually swimming or paddling.
Here body weight is fixed at 75 kg while float length changes, since tubing sessions vary enormously — a short 30-minute float between two access points, a relaxed two-hour afternoon session, or a longer full-day float all take very different amounts of time.
| Float Length | Hours | Calories | Kilojoules |
|---|---|---|---|
| 30 minutes | 0.5 | 86 kcal | 361 kJ |
| 60 minutes | 1.0 | 173 kcal | 722 kJ |
| 90 minutes | 1.5 | 259 kcal | 1,083 kJ |
| 120 minutes | 2.0 | 345 kcal | 1,443 kJ |
| 180 minutes | 3.0 | 518 kcal | 2,165 kJ |
Australian nutrition panels list energy in kilojoules, not calories, so it helps to see your float session in the same unit your food and drink packaging uses. Multiply your calorie figure by 4.184 to get kilojoules. A 75 kg person floating for 120 minutes burns about 345 kcal, which is roughly 1,443 kJ — a modest number worth keeping in mind next to the energy value printed on the drinks and snacks that so often accompany a day of river tubing.
How many calories does river tubing burn?
For a 75 kg person floating for a typical 120-minute (2-hour) session, river tubing burns roughly 345 kcal, about 1,443 kJ. This uses a MET value of 2.3, one of the lowest MET values used on this site, and scales directly with your own body weight and float time — use the calculator above for a figure based on your details.
Why is the calorie burn from river tubing so low?
River tubing is essentially passive floating — you sit in an inflatable inner tube while the current carries you downstream, with only occasional light paddling or steering with your hands or feet. A MET of 2.3 is only just above the 1.0 MET baseline for sitting quietly at rest, which reflects how little muscular effort is actually involved. Unlike swimming or paddling a kayak, there's no sustained propulsion happening, so the energy cost stays close to what you'd burn simply sitting in a chair for the same length of time.
Is the MET value for river tubing based on published research?
Not directly. The 2024 Adult Compendium of Physical Activities flags this code (18352, "tubing, floating on a river, general") as an estimated MET value, shown in red in its source table. That means the figure of 2.3 has been assigned by the Compendium's editors as a reasonable planning estimate rather than measured through a dedicated published study of river tubing specifically. It's the best available published figure, but it should be treated as an approximation rather than a precise, lab-confirmed number.
Does river tubing count as exercise?
Honestly, no — not in any meaningful sense. With a MET of 2.3, tubing sits barely above resting level and does very little to raise your heart rate or breathing rate. It's a relaxing, sociable way to spend time on the water on a hot day, but it shouldn't be counted toward your exercise for the day. If you want the fitness benefits of being in or on the water, actually swimming or paddling will do far more.
How does tubing compare to swimming or kayaking?
Tubing burns considerably fewer calories than either. Swimming involves continuous, whole-body propulsion against the water and typically carries a MET well above 6, while kayaking involves sustained paddling effort with a MET usually in the 3–5 range depending on pace. Tubing, by contrast, involves almost no active propulsion — you're carried by the current — so its MET of 2.3 sits far below both. If you want to compare the numbers directly, this site's swimming and kayaking calorie calculators use those higher MET values.
What factors affect how many calories I actually burn tubing?
The calculator uses a single population-average MET value multiplied by your body weight and float time, but real-world tubing sessions vary. Paddling occasionally to steer or avoid obstacles, swimming between tubes, walking tubes back upstream, or fighting a stronger current will all add a little extra effort beyond passive floating. None of this is captured by the simple formula, so treat the result as a baseline estimate rather than an exact figure.
What safety precautions should I keep in mind while tubing?
River tubing usually means extended time in direct sun and on the water, so sensible precautions include wearing sunscreen and reapplying it regularly, wearing a hat and sunglasses, staying well hydrated, and wearing a properly fitted life jacket where currents or river conditions warrant one. Check local conditions and river flow before heading out, be aware that currents can be stronger than they look, and never tube alone in unfamiliar or fast-flowing water. This is general commonsense advice, not safety or medical guidance — check local river conditions and safety information before you go.
How do I convert the calorie result to kilojoules?
Multiply your calorie figure by 4.184 to get kilojoules, which is the unit used on Australian nutrition labels. For example, 345 kcal from a 75 kg person's 120-minute float converts to roughly 1,443 kJ. The calculator above does this conversion automatically alongside the calorie figure.