How Many Calories Does a Pound of Muscle Burn at Rest?

The short answer: About 6 calories a day, not 50. The standard research value for resting skeletal muscle is 13 kcal per kilogram per day, which converts to about 5.9 kcal per pound. Fat tissue burns about 2 kcal per pound per day at rest. Adding five pounds of muscle therefore raises resting burn by roughly 30 kcal a day.

What is the measured figure for a pound of muscle?

The number comes from work on organ and tissue metabolic rates. A 2010 study in the American Journal of Clinical Nutrition tested a set of values first proposed by Elia in 1992. The value for skeletal muscle is 13 kcal per kilogram per day. The value for adipose (fat) tissue is 4.5 kcal per kilogram per day.

The researchers measured organ and tissue masses with MRI in 131 healthy, nonobese adults. They compared the predicted resting energy expenditure with the figure from indirect calorimetry. The values held up in young and middle-aged adults. In adults over 50 they ran about 3% high, and the age-adjusted muscle value was 12.6 kcal per kilogram per day.

Here is the conversion. One pound is 0.4536 kg.

• Muscle: 13 kcal/kg x 0.4536 kg = 5.9 kcal per pound per day.
• Muscle, adults over 50: 12.6 kcal/kg x 0.4536 kg = 5.7 kcal per pound per day.
• Fat tissue: 4.5 kcal/kg x 0.4536 kg = 2.0 kcal per pound per day.

A second research group used a matching figure. A 2002 paper in the American Journal of Physiology assigned skeletal muscle 54.4 kJ per kilogram per day. Divide by 4.184 kJ per kcal and you get 13.0 kcal per kilogram.

These are resting values. They describe muscle that is doing nothing. Working muscle burns far more, which matters later in this article.

Is the 50 calories per pound claim wrong?

Yes. It is about eight times too high (50 divided by 5.9 is 8.5). We found no measured study that supports it.

A quick check shows why it cannot be right. The adults in the 2010 study carried 26.3 kg of skeletal muscle on average. That is 58 pounds (26.3 divided by 0.4536). At 50 kcal per pound, their muscle alone would burn 2,900 kcal a day at rest. Their measured resting energy expenditure for the whole body averaged 1,575 kcal a day.

Muscle does burn more than fat at rest. The ratio is about 3 to 1 (13 divided by 4.5 is 2.9). The gap per pound is small in absolute terms: 5.9 minus 2.0 is 3.9 kcal a day.

How does muscle compare with the liver, brain, heart and kidneys?

At rest, muscle is a low-rate tissue. Your organs do most of the work. The same 2010 paper lists these values, converted here with the same 0.4536 factor:

• Heart and kidneys: 440 kcal/kg per day, or about 200 kcal per pound.
• Brain: 240 kcal/kg per day, or about 109 kcal per pound.
• Liver: 200 kcal/kg per day, or about 91 kcal per pound.
• Skeletal muscle: 13 kcal/kg per day, or about 5.9 kcal per pound.
• Fat tissue: 4.5 kcal/kg per day, or about 2.0 kcal per pound.

The paper notes that the muscle value is about 1/35 that of the heart and kidneys. You cannot train your liver to grow, so these organ figures are not a lever. They do explain why resting burn tracks body size and lean mass more than gym history. Our explainer on total daily energy expenditure covers how resting burn fits into the full day.

What share of resting energy does muscle account for?

About one fifth, using the averages in that study. Muscle wins on quantity, not on rate.

• Muscle: 26.3 kg x 13 = 342 kcal a day. Against a predicted resting total of 1,588 kcal, that is 22%.
• Liver, brain, heart and kidneys: (1.39 x 200) + (1.33 x 240) + (0.31 x 440) + (0.29 x 440) = 861 kcal a day, or 54%.
• Fat tissue: 19.4 kg x 4.5 = 87 kcal a day, or 5.5%.

Those four organs weigh 3.32 kg together. Average body mass in the study was 73.7 kg. So about 4.5% of body weight produced over half of the resting burn. These shares are our arithmetic from the paper's average masses, and they will differ from person to person.

What does gaining a few pounds of muscle change per day?

Less than most people hope. Start with how much muscle a training program adds. A 2020 meta-analysis of 111 studies in healthy adult men found that resistance training increased muscle mass by 1.53 kg on average. That is 3.4 pounds (1.53 divided by 0.4536).

• Average training gain: 1.53 kg x 13 = about 20 kcal a day at rest.
• Five pounds of new muscle: 5 x 5.9 = about 30 kcal a day.
• Five pounds of fat swapped for five pounds of muscle: 5 x 3.9 = about 20 kcal a day.

The 50 calorie claim would predict 250 kcal a day for five pounds. The tissue values predict about 30. If you set a calorie target, do not add a large muscle bonus to it. Use the method in how to calculate your TDEE and adjust from real scale trends.

What did resistance training studies measure for resting metabolic rate?

Small increases, with wide spread between people. The measured changes are somewhat larger than tissue mass alone predicts.

In a trial of 96 workouts over about nine months, resting metabolic rate rose from 1,653 to 1,726 kcal a day. That is a 73 kcal change, about 5% on average. A body composition model predicted a 52 kcal change. The authors reported wide variability between individuals, partly explained by changes in fat-free mass and thyroid hormones.

A 2020 systematic review and meta-analysis in the Journal of Sports Sciences pooled 18 studies. Resistance exercise raised resting metabolic rate by 96 kcal a day compared with controls (95% CI 45 to 147). Aerobic exercise showed no significant effect. The authors flagged heterogeneous methods and a high risk of bias in the included studies, so treat 96 as a rough upper estimate.

Even the larger figure is modest. It is real, but it does not offset a large calorie surplus.

Why does resistance training still matter?

The resting calorie bump is the weakest reason to lift. The stronger reasons are these.

• The session itself burns energy. In a study using indirect calorimetry, five upper-body exercises done for three sets each cost 168 kcal gross. One set each cost 71 kcal.
• Muscle handles glucose. A review in Diabetes Care states that about 80% of glucose uptake occurs in skeletal muscle under insulin clamp conditions.
• It protects lean mass during weight loss. In the SUSTAIN 8 body composition substudy, semaglutide 1.0 mg reduced fat mass by 3.4 kg and lean mass by 2.3 kg over 52 weeks. Lean mass includes water and organ tissue, so it is not all muscle. Readers on these medicines can find more at glp1.md. Our guide to preserving muscle in a calorie deficit covers the protein and training evidence.
• It is part of the public health guidance. The CDC says adults need at least 2 days of muscle-strengthening activity each week, in addition to 150 minutes of moderate-intensity activity.

Strength and physical function are outcomes in their own right. They do not show up in a calorie count.

The bottom line

A pound of resting muscle burns about 6 kcal a day, and a pound of fat burns about 2. Muscle accounts for roughly a fifth of resting energy use because there is a lot of it. Typical training gains add about 20 to 30 kcal a day through tissue mass, and trials measured total changes of roughly 70 to 100 kcal a day. Lift for strength, glucose control and lean mass retention. Do not count on new muscle to change your calorie budget much.

Last updated: October 2026. This article is for informational purposes only and does not constitute medical advice. Talk with your doctor before you start a new exercise program or change your diet, especially if you have a medical condition or take weight loss medication.