Masturbation burns roughly 5 to 6 calories per session. That’s about the same as walking a few hundred feet or sitting through a couple of minutes of light stretching. It’s a real energy expenditure, but it’s nowhere close to a workout.
Where the Number Comes From
There’s no laboratory study that has strapped participants to a metabolic cart specifically during masturbation, so exact figures don’t exist in the scientific literature. The commonly cited 5-to-6-calorie estimate is based on applying standard metabolic formulas to the activity’s intensity and typical duration.
The Compendium of Physical Activities, a database researchers use to estimate energy costs, categorizes sexual activity into three tiers: passive or light effort at 1.8 METs, general moderate effort at 3.0 METs, and active vigorous effort at 5.8 METs. A MET is simply how many times harder your body works compared to sitting still. Most solo sessions fall into the passive-to-moderate range (1.8 to 3.0 METs), because your body is relatively stationary and the exertion is concentrated in a small muscle group.
To put those numbers in context: walking at a casual pace is about 2.5 METs, and light housework is around 2.0. So the physical demand of masturbation is comparable to folding laundry.
How Your Body Responds
Even though the calorie burn is modest, your body does go through a measurable physiological cycle. Heart rate rises during arousal, blood pressure increases around the point of orgasm, and both gradually return to baseline afterward. An electrocardiographic study of healthy men found that heart rate actually decreased in the period immediately following ejaculation, consistent with the relaxation response most people feel.
Orgasm also triggers a burst of hormone activity. Your brain releases endorphins (natural painkillers), dopamine (the reward signal), and oxytocin (linked to relaxation and bonding). After orgasm, prolactin levels rise while dopamine and oxytocin drop back down. That prolactin surge is largely responsible for the drowsy, satisfied feeling that follows. None of these hormonal shifts meaningfully change your metabolic rate, though. The calorie cost of producing and releasing hormones is negligible.
Why It Burns So Little
Three factors keep the number low: limited muscle recruitment, short duration, and low cardiovascular demand. Partnered sex, by comparison, involves more of the body. You’re supporting your weight, shifting positions, and engaging your core, legs, and arms for a longer stretch of time. Studies on heterosexual couples have found that a session of intercourse lasting around 25 minutes burns roughly 70 to 100 calories for men and 50 to 70 for women. That’s a dramatically different activity profile from solo masturbation, which typically lasts a fraction of that time and keeps most of the body at rest.
Your body weight does play a role. A heavier person burns slightly more calories doing any activity because it takes more energy to fuel a larger body, even at rest. But when the total expenditure is already in the single digits, the difference between someone weighing 140 pounds and someone weighing 220 pounds amounts to maybe one or two extra calories.
What Actually Affects the Burn
If you’re genuinely curious about maximizing the energy cost, duration is the only meaningful lever. A session that lasts 3 minutes will burn fewer calories than one lasting 20 minutes, simply because your heart rate stays elevated longer and your muscles stay active. But even a prolonged session is unlikely to push past 20 to 30 calories, which is still less than a 10-minute walk.
Standing versus lying down, tensing large muscle groups, or incorporating more full-body movement would technically increase the demand, but at that point you’re really just exercising while also masturbating. The masturbation itself remains a minor contributor.
Health Benefits Beyond Calories
The real benefits of masturbation have nothing to do with calorie burn. Regular ejaculation is linked to a measurable reduction in prostate cancer risk. A large follow-up study tracked men over several decades and found that those who ejaculated 21 or more times per month had about a 20% lower risk of prostate cancer compared to men who ejaculated 4 to 7 times per month. This association held for men in their 20s and again for men in their 40s.
Masturbation also relieves stress, improves sleep quality through that post-orgasm prolactin release, and helps people understand their own sexual response. These are all well-documented effects that matter far more to your health than whether you burned 5 or 6 calories in the process.