SnapCalorieBurn — free MET-based calorie calculators
Eight hours of sleep burns 380–660 calories. See your estimate by weight plus how sleep quality affects calorie burn.
Eight hours of sleep burns approximately 380–660 calories — a significant portion of your daily energy expenditure happening entirely at rest.
Eight hours is within the recommended sleep range for most adults and represents the gold standard for recovery and metabolic health. During this time, your body cycles through 4–5 complete sleep cycles, each lasting about 90 minutes.
The calories burned during 8 hours of sleep are comparable to a 30-minute moderate walk or a 20-minute easy jog. While the per-minute rate is much lower, the extended duration makes sleep a significant daily calorie burner.
Sleeping in a cooler room (65–68°F / 18–20°C) forces your body to generate more heat, slightly boosting energy expenditure. More importantly, consistent 8-hour sleep supports the hormonal balance needed for healthy appetite regulation and efficient metabolism during waking hours.
Direct answer: 8 hours of sleeping burns an estimated 448–790 calories, depending on body weight (180 lb / 82 kg: ~623 kcal). Intensity assumed: Asleep (MET 0.95). This is an estimate, not a measurement.
| Body weight | Calories burned |
|---|---|
| 130 lb (59 kg) | ~448 cal |
| 155 lb (70 kg) | ~532 cal |
| 180 lb (82 kg) | ~623 cal |
| 205 lb (93 kg) | ~707 cal |
| 230 lb (104 kg) | ~790 cal |
Example: At MET 0.95, a 180 lb (82 kg) person doing 8 hours of sleeping burns approximately 623 calories: 0.95 × 82 × 8.00 h ≈ 623 kcal.
An estimated 448–790 calories, depending on body weight. A 180 lb (82 kg) person burns about 623 kcal, calculated as MET 0.95 × 82 kg × 8.00 hours.
About 1.3 kcal per minute for a 180 lb (82 kg) person, or 7.6 kcal per kilogram of body weight across the whole session.
Because the MET formula scales directly with body mass: a 130 lb person burns about 448 kcal here versus 790 kcal for a 230 lb person — a 76% spread for the identical session.
From the 2024 Adult Compendium of Physical Activities, the reference database of measured MET intensities for physical activities. Every figure on this page uses that value in the formula Calories = MET × body weight (kg) × duration (hours).
They are estimates from population averages, not measurements. Individual results commonly land within about ±15% of the figure shown; actual intensity and pace, body composition and fitness, terrain and technique all shift the real number. The values are gross calories, so they include the energy you would have burned at rest.
Open the sleeping calorie calculator to enter your own weight, intensity and duration.