The number of calories burned during 20 minutes of jumping jacks depends heavily on body weight, intensity, and fitness level, but a general estimate is 150-250 calories for a person of average weight (roughly 150-180 lbs / 68-82 kg) performing at moderate-to-vigorous intensity.
Jumping jacks are a high-intensity, full-body cardio exercise, so calorie burn scales significantly with body weight. Using common MET (Metabolic Equivalent of Task) values, jumping jacks are typically rated around 8 METs for a vigorous pace. Using the formula Calories = MET x weight (kg) x time (hours):
- A 125 lb (57 kg) person: approximately 150 calories in 20 minutes
- A 155 lb (70 kg) person: approximately 185 calories in 20 minutes
- A 185 lb (84 kg) person: approximately 220 calories in 20 minutes
- A 220 lb (100 kg) person: approximately 265 calories in 20 minutes
These figures assume continuous, vigorous effort for the full 20 minutes without rest breaks. If done at a slower or more moderate pace, or broken into intervals with rest, the burn could be lower — closer to 100-150 calories for the same duration.
Several factors influence the actual number:
- Body weight: Heavier individuals burn more calories doing the same activity because more energy is required to move greater mass.
- Intensity and form: Full range of motion, higher speed, and adding arm movement overhead all increase energy expenditure.
- Fitness level: Trained individuals may burn slightly fewer calories at the same perceived effort due to improved efficiency, though they can often sustain higher intensity.
- Age and sex: Metabolic rate differences based on age, sex, and muscle mass also play a role.
For a more precise estimate tailored to your specific weight, age, and effort level, a fitness tracker with heart-rate monitoring or a calorie calculator app will give more personalized results than generic tables.