Calories Burned Doing high-impact aerobics at 55 kg — 402 kcal per Hour
calories burned doing high-impact aerobics 55kg — the short answer is 402 kcal per hour. That figure is for a 55 kg (121 lb) person doing high-impact aerobics at the intensity the 2011 Compendium of Physical Activities assigns to it, and this page works the number out in full so you can check it, scale it to any session length, and see how it compares with other activities at the same body weight.
The headline number is an estimate, not a measurement of your body. Two people of the same weight doing the same activity for the same hour will burn different amounts, because fitness, technique, temperature, and how hard they actually push all move the real figure. What the formula gives you is a fair, standardised comparison — the same method researchers use when they rank activities by energy cost — and that is exactly what it is useful for: comparing options, planning a week, and setting a realistic expectation before you start.
High-impact aerobics is the jumping version of the aerobics class: hops, jumps, jogging steps and travelling moves, all to music, with both feet leaving the floor at times. It is rated at 7.3 METs in the Compendium — the same value as aerobic dancing and Zumba — which puts it firmly in the vigorous zone. The burn is high, but so is the load on the knees, ankles and lower back, so it suits people who are already reasonably fit and free of joint problems.
Work out your own number
Use the calorie calculator to get your own daily figure: it combines your basal metabolic rate with your activity level and your goal, so a single activity session slots into a full-day picture instead of floating on its own. If you want the activity alone at your exact weight rather than the 55 kg worked example on this page, the running calorie calculator takes any weight and duration and applies the same MET method. Both tools show their working, and both label their results as estimates.
The formula, shown and cited
The calculation comes from the Compendium of Physical Activities (Ainsworth et al., Medicine & Science in Sports & Exercise, 2011; 43(8):1575–1581), which assigns every activity a MET value — a multiple of your resting metabolic rate. One MET is the energy you use sitting quietly. The formula is:
Calories per hour = MET × body weight (kg)
For this page the MET value for doing high-impact aerobics is 7.3, which makes it a vigorous-intensity activity by the usual classification (under 3 METs is light, 3 to 6 is moderate, above 6 is vigorous). The worked example uses the midpoint of the 50-60 kg band, 55 kg:
7.3 MET × 55 kg = 402 kcal per hour
For any other duration, multiply by the hours: calories = MET × weight (kg) × hours. A 30-minute session is half the hourly figure, a 90-minute session is one and a half times it, and the table below does that arithmetic for the common session lengths so you do not have to.
Your numbers at 55 kg
| Session length | Calculation | Calories burned |
|---|---|---|
| 15 minutes | 7.3 × 55 × 0.25 | 100 kcal |
| 30 minutes | 7.3 × 55 × 0.50 | 201 kcal |
| 45 minutes | 7.3 × 55 × 0.75 | 301 kcal |
| 60 minutes | 7.3 × 55 × 1.00 | 402 kcal |
| 90 minutes | 7.3 × 55 × 1.50 | 602 kcal |
| 120 minutes | 7.3 × 55 × 2.00 | 803 kcal |
A useful way to read the table is backwards: to burn roughly 500 kcal from doing high-impact aerobics alone at 55 kg you would need about 75 minutes. Three one-hour sessions a week come to about 1206 kcal a week from this activity, and five 45-minute sessions come to about 1508 kcal a week. Those weekly totals are the numbers that matter for weight management, because a single session is a small fraction of a week's energy balance — consistency across weeks is what moves body weight, not one heroic session.
Note also that the table scales linearly with weight. A heavier person burns more doing the same activity for the same time, because there is more body to move; a lighter person burns less. That is not a judgement about fitness — it is physics, and it is why every calories-burned figure on this site states the weight it was calculated at. If you weigh 10 kg more than the 55 kg example, add roughly 73 kcal per hour; 10 kg less, subtract the same.
How doing high-impact aerobics compares at 55 kg
| Activity | MET | kcal per hour | kcal per 30 minutes |
|---|---|---|---|
| Doing high-impact aerobics | 7.3 | 402 | 201 |
| Aerobic dancing | 7.3 | 402 | 201 |
| Zumba | 7.3 | 402 | 201 |
| Doing step aerobics | 7.5 | 412 | 206 |
| Jogging | 7 | 385 | 192 |
The comparison is the honest way to choose between activities. A higher MET is not automatically better: an activity you enjoy and repeat three times a week beats a harder one you quit after a fortnight, and joint-friendly options matter more than raw burn for anyone with knees or a back that complain. Use the table to see the trade-offs — for example, swapping a lower-MET activity for a higher one for the same 30 minutes — and then choose on enjoyment and sustainability, not on the biggest number.
How to use the result
The 7.3 MET value assumes a full class pace with jumps included and arms working. If you replace the jumps with low-impact alternatives, the cost drops towards the 5.0 MET low-impact value — which is a perfectly sensible modification, not a failure. A good class lets you scale the impact up or down without leaving the routine.
Start with the session you can actually repeat. If you are new to doing high-impact aerobics, two or three 30-minute sessions a week (201 kcal each at 55 kg) is a sensible first month, adding 10 minutes a session each week rather than jumping straight to hour-long efforts. If you already do it regularly, the 60- and 90-minute rows are your planning numbers: block them into your week the way you would any other appointment, and track the sessions rather than the calories, because sessions are what you control.
For weight loss, the activity calories sit on top of your daily food intake, and the safe frame is a deficit of roughly 300–500 kcal a day, aiming for 0.5–1% of body weight per week. Never let the activity numbers talk you into eating far less: the safety floors are 1,200 kcal a day for women and 1,500 kcal a day for men, and any intake below those needs medical supervision. A 402-kcal session does not "earn" an extra meal of the same size, either — the body compensates, appetite rises after hard sessions, and the deficit that matters is the weekly average, not a single day's maths.
Practical tips specific to doing high-impact aerobics: Wear proper cross-trainers with cushioning and lateral support; running shoes are built for straight lines and are less stable for side steps. Land softly with knees slightly bent and your weight over the middle of the foot, never with locked knees. Do it on a sprung floor or a mat where possible, and keep it to two or three sessions a week rather than daily, to give the joints recovery time.
What the number does NOT tell you
MET values are population averages, and the error on any single person is real. The Compendium value was measured on a sample of adults, not on you, and it assumes a standard intensity: a relaxed game, a steady paddle, a moderate slope. If you push harder than the standard, you burn more; if you coast, you burn less. Heart-rate monitors and power meters estimate the same thing from different signals and disagree with each other by 10 to 20% on a good day, so treat every figure — including this page's — as accurate to roughly that band, not to the single calorie.
The figure also counts gross energy, which includes the calories you would have burned sitting still during that hour anyway. The extra burn above rest is the gross figure minus your resting rate for that hour (roughly 55 kcal for a 55 kg person at 1 MET), so the net cost of an hour of doing high-impact aerobics is about 347 kcal, not 402. That distinction matters when you add activity calories to a daily total that already includes your resting metabolism — counting gross calories on top of a full BMR double-counts the resting hour.
Finally, the formula knows nothing about your body composition, fitness, or health. Muscle burns more than fat at rest, trained people are more efficient at a familiar activity (and therefore burn slightly less for the same work), and illness, heat, altitude, and medication all shift the real number. If you have a medical condition, are pregnant, or take medication that affects heart rate or metabolism, treat this page as background information and talk to a clinician before building a training or weight-loss plan around it.
Related pages
- Calories burned hub
- Calories Burned Doing high-impact aerobics at 65 kg — 474 kcal per Hour
- Calories Burned Doing high-impact aerobics at 75 kg — 548 kcal per Hour
- Calories Burned Doing high-impact aerobics at 85 kg — 620 kcal per Hour
Frequently asked questions
How many calories does doing high-impact aerobics burn in 30 minutes at 55 kg?
About 201 kcal. The calculation is 7.3 MET × 55 kg × 0.5 hours = 201 kcal, from the 2011 Compendium value of 7.3 METs. It is an estimate: your real figure depends on how hard you push, and a relaxed session will come in lower.
Is doing high-impact aerobics good for weight loss?
It can help, because at 402 kcal an hour it is a vigorous-intensity activity that makes a real contribution to a weekly deficit — three hour-long sessions are about 1206 kcal a week. But weight loss is decided by the weekly energy balance, not by one activity, so the food side matters at least as much. Keep daily intake at or above 1,200 kcal (women) or 1,500 kcal (men) unless a clinician supervises a lower intake.
How long do I need to do high-impact aerobics to burn 500 calories?
About 75 minutes at 55 kg at the standard intensity. Splitting it across days is fine — two 45-minute sessions and one shorter one add up to the same total, and shorter, more frequent sessions are easier to sustain.
Is high-impact aerobics bad for your knees?
It loads the knees more than low-impact work, so people with existing knee problems often do better with the low-impact version. For healthy knees, the impact is generally well tolerated when the landing technique is soft and the surface is forgiving. Sharp pain is a stop signal, not something to push through.
How is high-impact aerobics different from low-impact aerobics?
The difference is whether both feet leave the floor. High-impact includes jumps, hops and jogging steps; low-impact keeps one foot down at all times. At the same weight, high-impact burns about 46% more per hour — 7.3 METs against 5.0 — but it also demands more from the joints.
Can I count doing high-impact aerobics towards the weekly activity guidelines?
Yes — at 7.3 METs it counts as vigorous-intensity activity, so every minute counts double towards the guideline of 150 minutes of moderate activity (or 75 minutes of vigorous activity) a week. Five 30-minute sessions would give you 150 minutes of moderate activity; two or three longer sessions can reach the same total.
Estimates only, not medical advice. Minimum safe intakes: 1,200 kcal/day women, 1,500 kcal/day men — consult a healthcare professional before a very-low-calorie diet.