Calories Burned During Sex Calculator

Calories burned during sex are the energy your body uses while sexually active, including the energy it would use at rest anyway. Like most activity calculators, this one uses METs (metabolic equivalents), which compare an activity's energy cost with sitting still. This tool is for adults 18 and over.

What This Estimate Measures

The result is the energy one person uses, based on their own weight and effort. It is not a measurement of you, and it does not track heart rate, pauses, or which partner is more active. It is a group average applied to your inputs.

The Formula

Total calories = MET x body weight (kg) x time (hours)

Calories above resting = (MET - 1) x body weight (kg) x time (hours)

The MET values come from the 2024 Adult Compendium of Physical Activities, which lists three levels of sexual activity: light effort (1.8 METs, code 14030), moderate effort (3.0 METs, code 14020), and vigorous effort (5.8 METs, code 14010)¹ ².

How This Calculator Computes Your Result

Enter your age group (18 to 59, or 60 or older), body weight in pounds or kilograms, effort level, and active time in hours and minutes. The tool converts pounds to kilograms and applies the formula at full precision. Because these totals are often small, anything under 50 kcal is shown to the single calorie, and larger figures to the nearest 5 kcal.

The result card shows total calories (including the energy you would burn sitting still), calories above resting (the extra compared with sitting quietly, 1.0 MET), calories per minute, and all three effort levels at your weight and time. If you choose 60 or older, you still get a result, with a note that the compendium has no older adult value for this activity.

What Your Result Means

Your total shows the energy used, and the above resting figure shows the extra. Here is a 25 minute session, the average length in a home study of 21 couples, at two example weights³:

At moderate effort, about a third of the total is energy you would have used sitting still anyway.

What Studies Have Measured

One study measured 21 young, healthy couples in Montreal who wore activity armbands at home³. Sessions lasted an average of about 25 minutes (range 10 to 57). Men burned an average of 101 kcal (4.2 kcal per minute) and women 69 kcal (3.1 kcal per minute), or about 85 kcal across everyone³. Men stayed higher than women even after the researchers accounted for body size³.

These figures sit close to the compendium's moderate row. For a 170 lb (77 kg) man and a 130 lb (59 kg) woman, the moderate value gives about 95 and 75 kcal for the same 25 minutes.

An older laboratory study measured heart rate and oxygen uptake in 10 healthy married men across four sexual activities⁴. Effort was modest, peaked briefly at orgasm, and returned quickly to near resting levels⁴. The authors noted that people and activities varied too much for one simple comparison⁴.

Myth Check: Sex Does Not Equal a Run

A popular claim says sex burns as much as a run. The same couples study tested this directly. Each person also did a 30 minute treadmill session at about 65% of maximum heart rate³. Men burned 276 kcal on the treadmill versus 101 kcal during sex, and women 213 kcal versus 69 kcal³. Sex used about 38% of the treadmill energy, and only 5% of participants rated it more strenuous³.

Per 10 minutes, here is how the compendium values compare (total calories)¹ ²:

The "Two Flights of Stairs" Comparison

An American Heart Association scientific statement describes sexual activity as mild to moderate, about 3 to 5 METs, roughly the equivalent of climbing two flights of stairs or walking briskly⁵. The statement calls this a generalization⁵. In people with normal blood pressure, heart rate rarely goes above 130 beats per minute and systolic pressure rarely above 170 mm Hg, with the largest rise during the 10 to 15 seconds of orgasm⁵. It also notes that regular exercise is linked with a lower risk of a heart attack during sex, and that people with heart disease should be checked by a doctor before resuming sexual activity⁵.

What Changes Your Burn

• Effort: the vigorous row is more than three times the light row.

• Active time: the compendium values assume active time, so long pauses make a total estimate run high.

• Body weight: a heavier person burns more at the same effort.

• Who does more of the work: in the couples study, men burned more per minute than women³.

• Age and fitness: the compendium values are averages for adults aged 19 to 59, so they may not fit older or very fit adults².