Most people burn about 80 calories per hour while sitting, based on research from Harvard Health. That works out to roughly 1.3 calories per minute. But this number shifts depending on your body size, age, sex, and muscle mass, so your personal rate could be noticeably higher or lower.
What Determines Your Sitting Calorie Burn
Even when you’re completely still in a chair, your body is doing an enormous amount of work. Your brain, liver, heart, and kidneys together account for 60 to 70 percent of the calories you burn at rest, despite making up less than 6 percent of your body weight. These organs never stop running, and they consume energy at a rate 15 to 40 times greater than the same weight of muscle tissue.
Skeletal muscle, on the other hand, makes up 40 to 50 percent of your total body weight but accounts for only 20 to 30 percent of resting calorie burn. Each pound of muscle burns roughly 4.5 to 7 calories per day at rest. Fat tissue burns even less, at about 50 to 100 times lower than organ tissue pound for pound. This is why two people sitting in the same chair for the same amount of time can burn meaningfully different amounts of energy.
How to Estimate Your Personal Number
The most widely recommended formula for estimating resting metabolic rate is the Mifflin-St. Jeor equation, endorsed by the Academy of Nutrition and Dietetics:
- Males: (10 × weight in kg) + (6.25 × height in cm) – (5 × age in years) + 5
- Females: (10 × weight in kg) + (6.25 × height in cm) – (5 × age in years) – 161
This gives you calories burned per day at complete rest. Divide by 24 to get your hourly resting rate. Sitting quietly burns slightly more than lying down, so you can multiply that hourly number by about 1.3 to estimate your seated calorie expenditure. For context, researchers assign sitting a MET value of 1.3, meaning it uses 30 percent more energy than lying perfectly still.
As a practical example, a 155-pound, 5’10” man in his mid-30s would have a resting metabolic rate of roughly 1,700 calories per day, or about 71 per hour at rest. Adjusted for sitting (multiplied by 1.3), that’s around 92 calories per hour. A 130-pound, 5’4″ woman of the same age might burn closer to 68 calories per hour while seated.
Fidgeting Makes a Surprising Difference
Not all sitting is equally still. Research on non-exercise activity found that fidgeting while seated, things like bouncing your leg, tapping your foot, or shifting your weight, increased calorie burn by an average of 54 percent compared to sitting motionless. For someone burning 80 calories per hour sitting still, that could mean burning closer to 120 calories per hour just by being restless in your chair.
The variation between individuals was large. Some people naturally fidget far more than others, and this habit can meaningfully affect total daily energy expenditure over weeks and months. Researchers have noted that these small, unconscious movements (collectively called non-exercise activity thermogenesis) contribute enough to energy balance that they help explain why some people seem to resist weight gain more easily than others.
Sitting vs. Standing: A Smaller Gap Than You Think
Standing desks are often marketed as a calorie-burning upgrade, but the actual difference is modest. In the same Harvard-cited research, standing burned about 88 calories per hour compared to 80 while sitting. That’s an extra 8 calories per hour, or roughly 64 extra calories over a full eight-hour workday. That’s less than a single apple.
Standing does engage more stabilizing muscles in your legs and core, and it may offer other health benefits like reduced back pain and better blood sugar regulation after meals. But if your primary goal is burning more calories, standing alone won’t make a dramatic difference.
Why Sitting Burns So Few Calories
Sitting is one of the lowest-energy activities your body can perform while still being awake. With your weight supported by the chair and most of your muscles disengaged, the only real energy demand comes from keeping your organs running and maintaining basic functions like breathing and body temperature. Your muscles, which are the body’s biggest potential calorie burners during movement, are doing almost nothing.
This is why an hour of walking (which burns roughly 200 to 300 calories depending on pace and body size) dwarfs an hour of sitting. The caloric cost of sitting is essentially your baseline, the minimum your body needs just to stay alive and conscious. Adding any movement at all, even standing, pacing, or fidgeting, starts to layer additional energy cost on top of that floor.
For someone who sits eight hours a day at work, that’s roughly 640 calories burned during the workday from sitting alone. The same person walking for those eight hours would burn somewhere between 1,600 and 2,400 calories. The gap illustrates why prolonged sitting is so consistently linked to metabolic concerns: it keeps your body running at its lowest possible energy setting for hours at a time.