Work out calories and kilojoules burned on a StairMaster or stepmill machine, based on your body weight, climbing intensity, and how long you were on it.
A StairMaster (stepmill) burns calories in proportion to your body weight, how hard you're climbing, and how long you keep going, captured in a MET (Metabolic Equivalent of Task) value for each intensity level. The formula is calories = MET × body weight in kilograms × time in hours. Climbing at a steady stepmill pace (MET 8.8) is more than double the intensity of a casual stair walk (MET 4.0), so intensity changes your result far more than most people expect. A 70 kg adult on a steady stepmill for 20 minutes burns close to 205 kcal, about 859 kJ.
| Metric | Value |
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The calculation comes down to three things: how hard you're climbing (expressed as a MET value), your body weight, and how long the session lasts. A harder intensity and a heavier body both burn more per minute, and more minutes simply adds more total calories on top.
The table below holds intensity and duration fixed at a steady stepmill pace (MET 8.8) for 20 minutes, so you can see how much body weight alone changes the result.
| Body Weight | MET | Calories (20 min) | Kilojoules |
|---|---|---|---|
| 60 kg | 8.8 | 176 kcal | 736 kJ |
| 70 kg | 8.8 | 205 kcal | 859 kJ |
| 80 kg | 8.8 | 235 kcal | 982 kJ |
| 90 kg | 8.8 | 264 kcal | 1,105 kJ |
| 100 kg | 8.8 | 293 kcal | 1,227 kJ |
Here body weight is fixed at 70 kg and only the intensity preset changes, so you can see exactly how much harder climbing affects the burn on its own.
| Intensity | MET | Calories/hour | Calories/minute |
|---|---|---|---|
| Casual pace | 4.0 | 280 kcal/hr | 4.67 kcal/min |
| Steady stepmill | 8.8 | 616 kcal/hr | 10.27 kcal/min |
| Vigorous stepmill | 9.8 | 686 kcal/hr | 11.43 kcal/min |
| Sprint intervals | 12.5 | 875 kcal/hr | 14.58 kcal/min |
Even the gentlest StairMaster setting works harder than most walking paces. A casual stair-climbing pace (MET 4.0) is already close to a brisk treadmill walk (MET 4.8, as used in our walking calorie calculator) in terms of effort, and stepping up to a steady stepmill pace (MET 8.8) roughly doubles the per-minute burn compared with that same brisk walk. For a 70 kg person, a brisk walk works out to about 5.6 kcal per minute, while a steady stepmill session comes in at roughly 10.27 kcal per minute — nearly double for the same clock time. The trade-off is fairly intuitive: stair climbing is far more calorie-dense per minute than walking, but it's also harder to sustain for long stretches, so a shorter, higher-intensity StairMaster session can match or beat a much longer walk for total calories burned.
Australian nutrition panels list energy in kilojoules, not calories, so it helps to convert your StairMaster burn into the same unit your food packaging uses. Multiply your calorie figure by 4.184 to get kilojoules. A 70 kg person doing 20 minutes on a steady stepmill burns about 205 kcal, which is roughly 859 kJ — useful to know if you want to weigh a session against the energy value printed on a snack or drink label.
How many calories does the StairMaster burn?
It depends on your body weight, intensity and duration. For a 70 kg adult on a steady stepmill pace (MET 8.8), that's about 616 kcal per hour, or roughly 205 kcal in 20 minutes. A casual pace (MET 4.0) burns about 280 kcal per hour, while sprint intervals (MET 12.5) can burn close to 875 kcal per hour. Use the calculator above with your own weight and duration for a more exact figure.
How many calories does 20 minutes on a StairMaster burn?
For a 70 kg adult over 20 minutes: a casual pace burns about 93 kcal, a steady stepmill pace burns about 205 kcal, a vigorous stepmill pace burns about 229 kcal, and sprint intervals burn about 292 kcal. Heavier or lighter body weights scale this figure up or down proportionally.
Is the StairMaster better than walking for weight loss?
Weight loss ultimately comes down to your total calorie deficit over time, not any single workout, so neither machine is automatically "better." What the StairMaster offers is a much higher calorie burn per minute — around 10.27 kcal/min at a steady pace for a 70 kg person compared with about 5.6 kcal/min for a brisk walk — so it can fit more calorie burn into a shorter session. Walking, on the other hand, is easier to sustain for longer and puts less strain on the joints, which matters for consistency. The best choice is whichever one you can do regularly.
Does StairMaster intensity make a big difference to calorie burn?
Yes, intensity has a bigger effect than most people expect. For a 70 kg person, moving from a casual pace (4.67 kcal/min) to a steady stepmill pace (10.27 kcal/min) more than doubles the burn rate, and sprint intervals (14.58 kcal/min) burn over three times as fast as a casual pace. Because intensity multiplies directly into the formula, even a modest increase in effort noticeably raises your total calories for the same time on the machine.
How many calories does the StairMaster burn per hour?
For a 70 kg adult: a casual pace burns about 280 kcal/hr, a steady stepmill pace burns about 616 kcal/hr, a vigorous stepmill pace burns about 686 kcal/hr, and sprint intervals burn about 875 kcal/hr. These figures scale up for heavier body weights and down for lighter ones, since calories per hour equals MET multiplied by body weight in kilograms.
Does body weight affect StairMaster calorie burn?
Yes, body weight is one of the three inputs in the calculation along with intensity and time. At a steady stepmill pace for 20 minutes, a 60 kg person burns roughly 176 kcal while a 100 kg person burns roughly 293 kcal for the identical session, because calories equal MET multiplied by weight in kilograms multiplied by time in hours. A heavier body simply does more mechanical work climbing the same steps.
How accurate are the calorie counters on gym StairMaster machines?
Machine displays are a rough estimate, not a precise measurement. They typically use a generic formula based on step rate and resistance, sometimes adjusted for the weight or age you enter, but they can't account for individual differences in fitness level, stride efficiency or how much weight you're leaning on the handrails (which reduces the real workload considerably). Treat the on-screen number as a ballpark figure and use a consistent method, like this calculator, if you want comparable numbers between sessions.
Is 30 minutes on a StairMaster enough to burn a lot of calories?
For a 70 kg person, 30 minutes at a steady stepmill pace burns about 308 kcal, compared with about 140 kcal for the same 30 minutes at a casual pace. That steady-pace figure is a substantial workout burn for half an hour, comparable to or higher than many other 30-minute cardio sessions at moderate effort, though your exact number depends on your body weight and how hard you push the intensity.