Energy is needed for breathing, circulation, temperature regulation and other essential functions, even when you are not exercising. Resting for a day may be appropriate during illness or recovery; do not use a generic calorie estimate to override medical advice.
What is resting metabolism?
MedlinePlus describes basal metabolic rate (BMR) as the energy needed for basic body functions. Resting metabolic rate (RMR) is a related measurement taken under less restrictive conditions. Neither is the same as the exact calories you burn during an ordinary day in bed, which can include eating, movement and sleep.
How can you estimate a day in bed?
A clinician or registered dietitian can estimate resting energy needs using a validated equation or, when appropriate, measure energy use through indirect calorimetry. Equations use inputs such as age, height, weight and sex-related variables and produce estimates, not measurements. They may be less accurate for an individual, particularly during illness or recovery.
As simple arithmetic, an estimated resting rate of 1,680 calories per day averages 70 calories per hour. That is an illustration, not a recommendation or a universal rate. Multiplying an hourly average by 24 does not capture every change between sleep, waking, eating and moving.
What changes the number?
- Body size and composition, age and other individual characteristics.
- Movement, including getting up, shifting position and daily tasks.
- Food digestion, sleep and environmental conditions.
- Illness, injury, medications and other health factors.
Energy needs can change over time. An online calculator cannot determine your nutritional needs or diagnose a metabolic condition.
A note on rest and nutrition
Being in bed does not eliminate your need for food or fluids. If you are recovering from illness, unable to get up, or concerned about appetite or weight, ask a healthcare professional or dietitian for individualized guidance. If prolonged bed rest has been prescribed, follow your care team’s plan for movement and nutrition.
Frequently asked questions
Do you burn calories while sleeping?
Yes. Your body continues to use energy for essential functions during sleep.
Does everyone burn 69 calories an hour in bed?
No. That figure cannot represent everyone’s resting energy use.
Is BMR the same as a full day’s calorie needs?
No. Daily needs also reflect digestion, activity and other factors.