Work out calories and kilojoules burned on an assault bike (air bike), based on your body weight, how hard you're pushing, and how long you keep the fan spinning.
An assault bike — also known as an air bike, fan bike, or by brand names like the Echo Bike or Airdyne — burns calories in proportion to your body weight, how hard you drive the pedals and handles, and how long you keep going, captured in a MET (Metabolic Equivalent of Task) value for each intensity tier. The formula is calories = MET × body weight in kilograms × time in hours. Because the fan is driven by both your arms and legs together, assault bike MET values sit noticeably higher than a regular stationary bike at what feels like the same perceived effort. An 80 kg rider doing 15 minutes at vigorous effort (MET 11.0) burns about 220 kcal, close to 920 kJ.
| Metric | Value |
|---|
| Intensity | MET | Calories | Kilojoules |
|---|
The calculation comes down to three things: how hard you're driving the pedals and handles (captured as a MET value for your chosen intensity tier), your body weight, and how long the session lasts. A harder intensity and a heavier rider both burn more per minute, and every extra minute simply adds more total calories on top.
Holding body weight and duration fixed at 80 kg for 15 minutes shows just how much the intensity tier alone changes the result.
| Intensity | MET | Calories (15 min) | Kilojoules |
|---|---|---|---|
| Light effort | 5.5 | 110 kcal | 460 kJ |
| Moderate effort | 8.5 | 170 kcal | 711 kJ |
| Vigorous effort | 11.0 | 220 kcal | 920 kJ |
| Max / all-out effort | 14.0 | 280 kcal | 1,172 kJ |
The table below holds intensity and duration fixed at vigorous effort (MET 11.0) for 15 minutes, so you can see how much body weight alone changes the result.
| Body Weight | MET | Calories (15 min) | Kilojoules |
|---|---|---|---|
| 60 kg | 11.0 | 165 kcal | 690 kJ |
| 70 kg | 11.0 | 193 kcal | 805 kJ |
| 80 kg | 11.0 | 220 kcal | 920 kJ |
| 90 kg | 11.0 | 248 kcal | 1,036 kJ |
| 100 kg | 11.0 | 275 kcal | 1,151 kJ |
Here body weight is fixed at 80 kg and only the intensity tier changes, so you can see exactly how much harder driving the fan affects the burn on its own.
| Intensity | MET | Calories/hour | Calories/minute |
|---|---|---|---|
| Light effort | 5.5 | 440 kcal/hr | 7.33 kcal/min |
| Moderate effort | 8.5 | 680 kcal/hr | 11.33 kcal/min |
| Vigorous effort | 11.0 | 880 kcal/hr | 14.67 kcal/min |
| Max / all-out effort | 14.0 | 1,120 kcal/hr | 18.67 kcal/min |
A regular upright or recumbent stationary bike works almost exclusively through your legs, with your arms mostly resting on the handlebars. An assault bike flips that setup: the fan blades sit on a shared axle driven by the pedal cranks and the moving handlebars at once, so pushing the pedals and pulling or pushing the handles both feed into the same source of resistance. That means your chest, shoulders, arms and core are all doing real mechanical work alongside your legs on every stroke, rather than just holding your upper body steady. Putting more muscle mass under load at the same time raises your oxygen demand and, in turn, your calorie burn — which is exactly why the MET values used on this page run roughly 15-20% higher than a comparable stationary cycling effort. A moderate assault bike session can feel about as taxing as a vigorous session on a regular exercise bike, simply because more of your body is contributing to the work.
Most gym bikes let you turn a knob or tap a screen to lock in a resistance level, so the machine decides how hard each pedal stroke feels. An assault bike doesn't work that way — there's no resistance dial at all. The fan blades push back harder purely because you're moving them faster and with more force; slow down, and the resistance drops away almost immediately. That's why the four tiers in this calculator — light, moderate, vigorous, and max/all-out — describe how hard you personally choose to drive the pedals and handles, rather than a fixed setting on the machine. Two riders on the same bike at the same time can be working at completely different intensities purely based on effort, and the same rider can shift tiers mid-session just by pushing harder or easing off, without touching anything on the console.
Australian nutrition panels report energy in kilojoules rather than calories, so it's useful to convert your assault bike burn into the same unit as your food packaging. Multiply your calorie figure by 4.184 to get kilojoules. An 80 kg rider doing 15 minutes at vigorous effort burns about 220 kcal, which comes to roughly 920 kJ — handy to compare against the energy value printed on a protein bar or recovery drink.
How many calories does an assault bike burn per minute?
It depends on your body weight and how hard you're pushing. For an 80 kg rider, light effort burns roughly 7.3 kcal per minute, moderate effort roughly 11.3 kcal per minute, vigorous effort roughly 14.7 kcal per minute, and max/all-out effort roughly 18.7 kcal per minute. Heavier riders burn more per minute at the same intensity because the calculation scales directly with body weight.
Why does an assault bike feel harder than a regular exercise bike?
An assault bike (also called an air bike, fan bike, or by brand names like Echo Bike or Airdyne) makes your arms and legs push and pull together against a single fan, so your whole body is under load at once rather than just your legs. That extra muscle mass working simultaneously demands more oxygen and burns noticeably more energy for a similar perceived effort, which is why the MET values used on this page run roughly 15-20% higher than a regular stationary bike at what feels like the same intensity.
How is intensity measured on an assault bike if there's no resistance dial?
Unlike a regular stationary bike, an assault bike has no fixed resistance level to select — the fan simply pushes back harder the faster and more forcefully you drive the pedals and handles. That means the four intensity tiers on this calculator (light, moderate, vigorous, and max/all-out) describe your own perceived effort rather than a machine setting, so the same rider can move between tiers mid-session just by pushing harder or easing off.
Is assault bike cardio good for weight loss?
Yes, assault bike sessions can support weight loss the same way any cardio does — by contributing to an overall calorie deficit. Because it recruits your arms and legs together, an assault bike lets you reach a high calorie burn rate in a short session; a 15-minute vigorous-effort session for an 80 kg rider burns around 220 kcal. Consistency and your total weekly energy balance matter far more than any single workout, though.
How does assault bike calorie burn compare with rowing?
Both are full-body cardio machines that recruit your arms, legs and core together, which is why both post higher MET values than machines that isolate the legs. A vigorous assault bike effort (MET 11.0) sits above a vigorous rowing effort (MET 8.5), largely because the assault bike's fan resistance grows with effort on both the pedals and the handles at once, while rowing's resistance is tied mainly to how hard you pull the chain. In practice the two tend to feel similarly demanding at matched perceived effort, and either is a solid choice for a full-body cardio session.
Can beginners use an assault bike?
Yes, though it's worth starting conservatively. Assault bikes have a reputation for feeling deceptively hard because the fan resistance increases the more effort you put in, so it's easy to go out too hard and fatigue within a minute. Beginners typically do well starting at a light-to-moderate effort for short intervals of one to two minutes, building up duration and intensity gradually as fitness improves. Anyone with a heart or joint condition should check with a doctor before starting a new high-intensity cardio activity.
What's a realistic assault bike interval workout?
A common beginner-friendly structure is 8 rounds of 20 seconds at vigorous-to-max effort followed by 40 seconds of light-effort recovery pedalling, totalling 8 minutes of work. More conditioned riders often extend this to 30-40 seconds of hard effort with an equal or shorter rest period, repeated for 10-15 minutes. Because effort is self-selected rather than set by a resistance dial, the same interval structure can be scaled to almost any fitness level just by adjusting how hard you push during the work phase.
What are the limitations of MET-based calorie estimates for an assault bike?
MET values are population averages drawn from studies of typical adults, so they don't account for your individual fitness level, technique efficiency, muscle mass, or how your body responds on a given day. Two riders working at what feels like the same 'vigorous' effort can produce different actual power outputs, and the perceived-effort tiers used here are a practical stand-in rather than a direct wattage measurement. Treat the results as a reasonable estimate for tracking trends over time, not an exact figure for any single session.