How Many Calories Does Sex Burn? What the Research Shows
How many calories does sex burn? Research suggests sexual activity uses around 3.6 calories per minute on average, but your actual burn depends on body size, duration, movement and how physically active you are.
Yes, sex burns calories. No, that does not automatically make every twenty-minute session the equivalent of a gym workout.
Sexual activity involves movement, muscle work and often an increase in heart rate and breathing. The harder question is putting an honest number on how much energy it actually uses.
One of the best-known studies to measure calories burned during sex followed 21 young heterosexual couples during sexual activity in their normal home environment.
Across the 42 participants, sexual activity used approximately 85 calories per session, or about 3.6 calories per minute on average.
Men in the study averaged about 4.2 calories per minute, while women averaged about 3.1 calories per minute. The average sexual session lasted approximately 24.7 minutes.
Those numbers give us a useful research benchmark — but they do not mean every person burns exactly the same amount.
How many calories does sex burn?
A small study of 42 young healthy adults found that sex burned around 3.6 calories per minute on average.
Men averaged approximately 4.2 calories per minute and women approximately 3.1 calories per minute.
Using the overall study average as a simple guide, that works out to roughly 36 calories in 10 minutes, 72 calories in 20 minutes and 108 calories in 30 minutes.
Your actual calorie burn may be higher or lower depending on your body, session length and how physically active you are.
What Does the Research Say About Calories Burned During Sex?
The study most commonly cited for this question was published in PLOS ONE in 2013.
Researchers recruited 21 heterosexual couples aged between 18 and 35 and measured energy expenditure during sexual activity using a portable SenseWear armband.
Importantly, the couples were studied during their usual sexual activity at home rather than being asked to recreate sex in a laboratory.
The researchers found:
- All participants: around 84.8 calories per session and 3.6 calories per minute
- Men: around 101 calories per session and 4.2 calories per minute
- Women: around 69.1 calories per session and 3.1 calories per minute
- Average session length: around 24.7 minutes
- Average intensity: approximately 5.8 METs
Important: this was a small study involving young, healthy and physically active adults. Its results give us a useful benchmark, not a universal calorie value for every person or every sexual encounter.
How Many Calories Does Sex Burn in 10, 20 or 30 Minutes?
If we simply extend the study’s measured calories-per-minute averages across different session lengths, we can create some useful reference figures.
These are mathematical projections from the study averages, not measurements of what every individual will burn.
| Session length | Overall average 3.6 cal/min | Men in study 4.2 cal/min | Women in study 3.1 cal/min |
|---|---|---|---|
| 10 minutes | ~36 calories | ~42 calories | ~31 calories |
| 15 minutes | ~54 calories | ~63 calories | ~47 calories |
| 20 minutes | ~72 calories | ~84 calories | ~62 calories |
| 25 minutes | ~90 calories | ~105 calories | ~78 calories |
| 30 minutes | ~108 calories | ~126 calories | ~93 calories |
| 60 minutes* | ~216 calories | ~252 calories | ~186 calories |
*The 60-minute figures are extrapolations. The original study did not find that a typical sexual session lasted one continuous hour.
The easiest benchmark to remember: the study average was approximately 3.6 calories per minute.
Sex Calorie Calculator: Estimate Your Calories Burned
Average figures are useful, but sex is hardly a standardised exercise.
Use the Wildfire Sex Calorie Calculator to create a more personalised estimate based on your weight, session length and how physically active you were.
Your height is used to calculate BMI for body-size context, while your sex selection determines which result from the 2013 study is shown as your research comparison.
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Aggregate calculator estimates only — not measured calorie burn.Calculator loading…
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How did we calculate this?
Your personalised estimate uses your body weight and the published MET value for the activity level you selected.
Calories per minute = MET × 3.5 × body weight in kg ÷ 200.
The activity levels are based on the 2024 Compendium of Physical Activities:
- 1.8 METs: passive or light effort
- 3.0 METs: general or moderate effort
- 5.8 METs: active or vigorous effort
Your research comparison is calculated separately using the averages measured in the 2013 study:
- Men: 4.2 calories per minute
- Women: 3.1 calories per minute
- Prefer not to say: overall study average of 3.6 calories per minute
BMI is calculated from your height and weight and shown for body-size context. It is not used as an additional calorie multiplier.
Private by design: your height, weight, BMI and position selection are calculated in your browser. If anonymous aggregate tracking is enabled, Wildfire records only the estimated calorie total, session-length bucket, effort bucket and research-comparison category.
Remember: this is a fun research-based estimate, not a laboratory measurement or medical assessment. Sexual activity varies enormously between people and between sessions.
Do Men and Women Burn Different Calories During Sex?
In the 2013 study, they did.
Men averaged approximately 4.2 calories per minute, while women averaged approximately 3.1 calories per minute.
Interestingly, the difference in energy expenditure remained statistically significant even after the researchers controlled for differences in BMI.
That still does not mean every man automatically burns more calories than every woman.
The study only included 21 men and 21 women, and factors such as body size, muscular effort, duration, movement and position can all affect energy expenditure.
In real life, who is doing more of the physical work may matter considerably.
Why Does Calorie Burn During Sex Vary So Much?
Sex is very different from stepping onto a treadmill and performing the same movement at the same speed for thirty minutes.
That is why calorie estimates can vary so widely.
Duration
More active time generally means more energy expenditure. Ten active minutes and forty active minutes are not doing the same maths.
Body size
Moving a larger body generally requires more energy, although body composition, fitness and the activity itself also matter.
How much you are moving
One partner may be doing most of the thrusting, lifting, supporting or repositioning while the other is doing considerably less physical work.
Position
Standing, supporting body weight or actively moving on top may demand more from the thighs, glutes, core and upper body than highly supported positions.
Intensity
Slow, relaxed movement does not require the same amount of energy as sustained, vigorous movement.
Breaks
A forty-minute sexual encounter does not necessarily mean forty continuous minutes at the same exercise intensity.
Sex is wonderfully difficult to standardise. Treat calorie figures as estimates rather than targets to beat.
Do Some Sex Positions Burn More Calories Than Others?
Probably — because different positions involve different amounts of movement, muscle engagement and body-weight support.
But there is not enough quality research to assign a reliable calorie number to every individual sex position.
That means claims such as “this position burns exactly 137 calories in twenty minutes” should be treated cautiously.
Does being on top burn more calories?
If the person on top is doing most of the active movement, they may expend more energy than a comparatively passive partner.
But simply being on top does not create a fixed calorie burn. Rhythm, support, duration and how much movement is actually happening still matter.
What about standing sex?
Standing positions may require additional balance, leg and core work, particularly if one person is supporting some of the other’s body weight.
Again, there is no scientifically defensible universal calorie figure for standing sex.
Want the muscle-and-movement version?
Our Sex Positions That Double as a Workout guide looks at which positions demand more from your legs, glutes, core and upper body without pretending every position has an exact calorie score.
Sex vs Running: Which Burns More Calories?
This is where the research gets particularly interesting.
The researchers concluded that the average intensity of sexual activity in their study was higher than walking at about 4.8 km/h but lower than jogging at about 8 km/h.
They also directly compared participants’ sexual activity with a controlled treadmill exercise session.
That treadmill session consisted of a five-minute walking warm-up followed by 30 minutes at 0% incline and approximately 65% of each participant’s maximum heart rate. The speed therefore varied from person to person.
| Activity | Speed / protocol | Intensity comparison | Measured calorie data |
|---|---|---|---|
| Walking | About 4.8 km/h | Lower intensity than the sexual activity measured in the study | Not directly measured in the sex study |
| Sexual activity | Participants’ usual activity | 5.8 METs overall | 3.6 cal/min overall |
| Moderate treadmill exercise | 0% incline at ~65% maximum heart rate | 8.4 METs overall | 8.2 cal/min overall |
| Jogging / running | About 8 km/h | Higher intensity than the sexual activity measured in the study | Not directly measured in the sex study |
So the answer is not simply “sex burns as much as running”.
The study suggests an average sexual session sat somewhere between an ordinary walk and an 8 km/h jog in exercise intensity.
The controlled treadmill exercise still burned substantially more calories per minute than sex on average.
Individual sexual sessions varied, so any comparison should be treated as a broad reference rather than a fixed conversion between sex, walking and running.
Does Sex Count as Cardio?
Sex can count as physical activity and, in the 2013 study, sexual activity reached moderate intensity on average.
Whether your particular session provides a meaningful cardiovascular workout depends on how actively and how continuously you are moving.
If you are moving continuously and your heart rate and breathing are elevated, you are doing physical activity. If your contribution is mainly moral support from the pillows, perhaps don’t log it as a 5K.
Sex can therefore contribute to an active lifestyle, but it should not automatically be treated as a replacement for regular cardiovascular and strength-based exercise.
We are keeping the deeper cardio question for a separate guide so this page stays focused on calorie burn.
How Many Calories Does an Orgasm Burn?
There is no good evidence giving us a reliable universal calorie figure for an orgasm itself.
An orgasm is usually brief. Although it involves muscle contractions and temporary changes in heart rate, breathing and other physiological responses, most of the calorie expenditure associated with sex comes from the activity surrounding it.
Better rule: count the movement, not the climax.
Can a Smartwatch Tell You How Many Calories Sex Burned?
A smartwatch can give you an estimate, but that does not mean the calorie number is exact.
Wearables typically combine data such as heart rate, movement, body size and proprietary algorithms to estimate energy expenditure.
The challenge is that sexual activity is highly variable and heart rate alone does not translate neatly into calories burned.
Research into consumer wearables has generally found that energy-expenditure estimates are less reliable than measurements such as heart rate on many devices.
If your watch announces that date night was a 487-calorie workout, enjoy the compliment — just don’t treat it as laboratory data.
Can Sex Help With Weight Loss?
Sex uses energy, so it contributes to your overall daily calorie expenditure.
For most people, however, the amount burned during sex is relatively modest compared with consistent structured exercise.
It makes more sense to think of sex as one enjoyable form of physical activity rather than a weight-loss program.
And calorie burn is hardly the only reason people choose to have sex. Pleasure, connection, intimacy and play are perfectly good outcomes without needing to turn the bedroom into a fitness studio.
So, How Many Calories Does Sex Actually Burn?
The best-known small study gives us a sensible starting point:
About 3.6 calories per minute on average.
Men in the study averaged about 4.2 calories per minute and women about 3.1 calories per minute.
That gives a simple overall estimate of approximately:
- 10 minutes: 36 calories
- 20 minutes: 72 calories
- 30 minutes: 108 calories
But body size, movement, position, effort and duration can all change the result — which is why our calculator uses more than one factor.
Sex burns calories. It can sometimes reach moderate exercise intensity. It may even leave you sweaty enough to feel like you earned the workout.
Just maybe keep the gym membership for now.
Continue Exploring
Sex Positions That Double as a Workout
Explore which positions involve more movement, balance, strength and muscle engagement.
Physical Intimacy Without Sex
Because intimacy does not always require intercourse — or a fitness tracker.
The Wildfire Guide to Intimacy
Explore emotional, physical and sexual connection beyond the calorie counter.
Frequently Asked Questions About Calories Burned During Sex
How many calories does sex burn in 10 minutes?
Using the overall study average of 3.6 calories per minute, 10 minutes of sexual activity would equal approximately 36 calories. Actual calorie burn may be higher or lower.
How many calories does sex burn in 15 minutes?
Using the 3.6-calorie-per-minute study average, 15 minutes works out to roughly 54 calories.
How many calories does sex burn in 20 minutes?
Twenty minutes at the study’s overall average would equal approximately 72 calories. Body size, movement and intensity can change the actual number.
How many calories does sex burn in 30 minutes?
A simple extrapolation from the overall study average gives approximately 108 calories for 30 minutes of sexual activity.
How many calories does an hour of sex burn?
Extending the study average of 3.6 calories per minute across 60 minutes gives approximately 216 calories. That assumes a similar activity level is maintained throughout the full hour, so it should be treated as a rough estimate rather than a measured universal figure.
Do men burn more calories during sex than women?
In one small study, men averaged 4.2 calories per minute and women 3.1 calories per minute. Body size, movement, position, duration and individual physiology also affect energy expenditure.
Does being on top burn more calories?
The person doing more active movement may use more energy, so being on top can be more physically demanding in some situations. There is no reliable universal calorie number for the position itself.
How many calories does an orgasm burn?
There is no reliable research assigning a universal calorie number to an orgasm. Most energy expenditure comes from movement and muscular activity surrounding it.
Does sex burn more calories than walking?
The 2013 study suggested that the average intensity of sexual activity was higher than walking at about 4.8 kilometres per hour, although individual sessions vary considerably.
Does running burn more calories than sex?
Generally, sustained running is more physically demanding. The study described sexual activity as lower in intensity than jogging at about 8 kilometres per hour.
Does sex count as cardio?
Sex can count as physical activity and was measured at moderate intensity on average in one small study. Whether an individual session provides a meaningful cardiovascular workout depends on how actively and how long you are moving.
Can a smartwatch accurately measure calories burned during sex?
A smartwatch can provide an estimate, but wearable calorie calculations are not precise measurements of energy expenditure. Heart-rate measurements may be more reliable than calorie estimates depending on the device and activity.
Sources & Further Reading
Energy Expenditure during Sexual Activity in Young Healthy Couples – PLOS ONE
The study behind the calories-per-minute, session duration, sex differences and exercise-comparison figures used in this guide.
Sexual Activity – 2024 Compendium of Physical Activities
Published MET values used in the Wildfire Sex Calorie Calculator.
Walking – 2024 Compendium of Physical Activities
Reference values for walking intensity and speed.
Running – 2024 Compendium of Physical Activities
Reference values for jogging and running intensity.
Reliability and Validity of Commercial Wearable Devices – Systematic Review
Research reviewing consumer wearable measurements including energy expenditure.
Want more movement than maths?
Our Sexercise guide looks at positions through movement, balance and muscle engagement — without pretending your bedroom comes with a laboratory-grade calorie counter.
Note: This article and calculator are for general educational and entertainment purposes. Calorie figures are estimates and should not be treated as individual medical, metabolic or fitness measurements.
