Enter Your Sleep and Body Details
Formula Used
Mifflin St Jeor BMR
Men: BMR = 10W + 6.25H - 5A + 5
Women: BMR = 10W + 6.25H - 5A - 161
Revised Harris Benedict BMR
Men: BMR = 88.362 + 13.397W + 4.799H - 5.677A
Women: BMR = 447.593 + 9.247W + 3.098H - 4.330A
Katch McArdle BMR
Lean Mass = Weight × (1 - Body Fat %)
BMR = 370 + 21.6 × Lean Mass
Sleep calorie estimate
Basal Sleep Calories = BMR ÷ 24 × Sleep Hours × Sleep Factor
MET Calories = MET × 3.5 × Weight kg ÷ 200 × Sleep Minutes
Final Estimate = (Basal Sleep Calories + MET Calories) ÷ 2
How to Use This Calculator
- Select your unit system.
- Enter age, sex, height, and weight.
- Add sleep hours and extra minutes.
- Select the BMR formula you prefer.
- Enter body fat if using Katch McArdle.
- Adjust sleeping MET, sleep quality, and room condition if needed.
- Click the calculate button.
- Download the result as CSV or PDF.
Example Data Table
| Profile | Weight | Height | Age | Sleep Time | Estimated Calories |
|---|---|---|---|---|---|
| Adult A | 60 kg | 165 cm | 28 | 7 hours | Approx. 375 kcal |
| Adult B | 75 kg | 175 cm | 35 | 8 hours | Approx. 505 kcal |
| Adult C | 95 kg | 182 cm | 42 | 8.5 hours | Approx. 660 kcal |
Sleeping Calorie Burn Guide
What the Number Means
Sleeping calorie burn is the energy your body uses while you rest. It supports breathing, blood flow, temperature control, and cell repair. The number is smaller than exercise burn, but it still matters. A long night can use a meaningful amount of energy, especially for people with higher body weight or higher basal needs.
Why BMR Matters
The main driver is basal metabolic rate. BMR estimates how many calories your body uses at complete rest. This calculator applies common equations and then adjusts the hourly rate for sleep. Sleep usually uses slightly less energy than quiet waking rest. The tool also offers a MET method. This method uses body weight, minutes slept, and a sleeping activity value.
Choosing Better Inputs
Inputs should be realistic. Enter your age, height, weight, and sleep time. Choose the formula that matches your available data. The Mifflin St Jeor method is a common general choice. The Katch McArdle method is useful when you know body fat percentage. The Harris Benedict option is included for comparison.
Limits of the Estimate
Results are estimates, not lab measurements. Real energy use can change with hormones, illness, muscle mass, medication, fever, pregnancy, room temperature, and sleep quality. Restless sleep may raise movement and energy use slightly. Very poor sleep can also affect appetite and recovery the next day.
How to Use Results
Use the output as a planning guide. It can help compare different sleep durations, show calories per hour, and create a simple record. Do not treat the result as a weight loss promise. Total daily balance depends on food intake, activity, training, stress, and health status.
Tracking and Downloads
The chart gives a clear picture of hourly burn across the night. The table shows sample profiles for comparison. The download buttons help save results for coaching notes or personal tracking. For medical nutrition plans, speak with a qualified professional. This is especially important if you manage diabetes, thyroid disease, eating disorders, pregnancy, or major weight changes.
Sleep Duration Context
Small changes in sleep length can change the estimate. One extra hour adds another hourly burn value. However, more sleep is not always better for every person. Consistent timing, enough duration, and good sleep quality usually matter more than chasing a calorie number alone over the long term.
FAQs
1. Do people burn calories while sleeping?
Yes. The body keeps breathing, circulating blood, repairing cells, and regulating temperature during sleep. These processes require energy, so calories are burned even when you are not moving.
2. Is this calculator accurate?
It gives a useful estimate, not a lab result. True calorie burn depends on body composition, hormones, health status, medications, fever, pregnancy, and sleep patterns.
3. Which BMR formula should I choose?
Mifflin St Jeor is a strong general choice. Katch McArdle is helpful when body fat percentage is known. Harris Benedict is included for comparison.
4. What is a sleeping MET value?
A MET value estimates activity energy cost. Sleeping is usually near 0.95 MET. You can adjust it slightly if you have a reason to compare different assumptions.
5. Does more sleep burn more calories?
More time asleep usually increases total calories burned. However, sleep quality, recovery, and consistent habits matter more than using sleep only to raise calorie burn.
6. Can this help with weight loss planning?
It can support general tracking. Weight change depends on total daily calorie balance, activity, food intake, health, stress, and long-term habits.
7. Why does body weight affect the result?
A larger body usually needs more energy to maintain basic functions. That often raises BMR and sleeping calorie estimates, though body composition also matters.
8. Should I use this for medical decisions?
No. Use it for education and simple tracking only. For medical nutrition advice, consult a qualified clinician or registered nutrition professional.