Glycogen Storage Capacity Calculator

Estimate skeletal-muscle glycogen capacity from body mass, estimated muscle percentage, and an entered glycogen concentration. This is not a daily carbohydrate prescription.

Muscle Glycogen Estimate Calculator

Enter the inputs below to estimate skeletal muscle glycogen (this does not include liver glycogen).

Estimated Muscle Glycogen Amount

Body Weight

Estimated Skeletal Muscle Mass (% of body weight)

If you’re using a body composition estimate (e.g., BIA/DEXA), note that “muscle mass %” can vary by method and is approximate.

Glycogen per kg of muscle (wet-weight estimate)

Values depend on training status, recent exercise, and carbohydrate intake. If you’re unsure, use an illustrative range (often roughly 5–25 g/kg muscle on a wet-weight basis).

Related Calculators

Muscle Glycogen Estimate Formula

The calculator estimates skeletal muscle glycogen only. It does not include liver glycogen or blood glucose.

Muscle Mass kg = Body Weight kg \times (Muscle Mass % / 100)

Muscle Glycogen g = Muscle Mass kg \times Glycogen per kg of Muscle g / kg

Combined into one formula:

Muscle Glycogen g = Body Weight kg \times (Muscle Mass % / 100) \times Glycogen per kg of Muscle g / kg

Muscle Glycogen_g is the estimated amount of glycogen stored in skeletal muscle, in grams.
Body Weight_kg is your body weight converted to kilograms.
Muscle Mass % is estimated skeletal muscle mass as a percentage of total body weight.
Glycogen per kg of Muscle_g/kg is the wet-weight glycogen estimate per kilogram of skeletal muscle.

The body weight field accepts kilograms or pounds. Pounds are converted to kilograms before the formula is applied.

The glycogen-per-kg field accepts mg/kg, g/kg, or kg/kg. The calculator converts that value to g/kg before estimating total muscle glycogen.

The result can be shown in mg, g, or kg. The calculation is performed in grams first, then converted to your selected output unit.

Typical Inputs for Estimating Muscle Glycogen

These ranges are approximate. Muscle glycogen changes with recent training, carbohydrate intake, fasting, and depletion from exercise.

Glycogen per kg of muscle	Possible interpretation
5 to 10 g/kg	Low estimate, often used after depletion, low carbohydrate intake, or prolonged exercise.
10 to 18 g/kg	Moderate estimate for mixed diet and normal training conditions.
18 to 25 g/kg	Higher estimate, often used after carbohydrate loading or strong repletion.
Above 25 g/kg	Possible in some contexts, but check that your input is on a wet-weight muscle basis.

Estimated skeletal muscle mass %	How to use it
Below 25%	May be possible in some cases, but double-check the body composition method and units.
25% to 35%	Common illustrative range for lower muscle mass estimates.
35% to 45%	Common illustrative range for many adults.
45% to 55%+	Higher estimate, more likely in lean or heavily trained individuals.

Example Calculations

Example 1: Estimate in grams

Suppose body weight is 80 kg, estimated muscle mass is 40%, and glycogen storage is 15 g/kg of muscle.

Muscle Mass = 80 \times (40 / 100) = 32 kg

Muscle Glycogen = 32 \times 15 = 480 g

The estimated skeletal muscle glycogen amount is 480 g.

Example 2: Body weight entered in pounds

Suppose body weight is 180 lb, estimated muscle mass is 38%, and glycogen storage is 12 g/kg of muscle.

Body Weight kg = 180 \times 0.453592 = 81.6466 kg

Muscle Mass = 81.6466 \times (38 / 100) = 31.0257 kg

Muscle Glycogen = 31.0257 \times 12 = 372.3084 g

The estimated skeletal muscle glycogen amount is about 372.31 g.

FAQ

Does this estimate total body glycogen?

No. This estimate is for skeletal muscle glycogen only. It does not include liver glycogen, which can be a meaningful separate store, especially in relation to fasting and blood glucose regulation.

Why does the glycogen-per-kg value make such a large difference?

The glycogen-per-kg value represents how full the muscle glycogen stores are. A depleted value and a carbohydrate-loaded value can produce very different totals even when body weight and muscle mass percentage stay the same.

Is muscle mass percentage the same as lean body mass percentage?

No. Lean body mass includes skeletal muscle, organs, bone, body water, and other non-fat tissues. This calculator needs estimated skeletal muscle mass percentage. If you enter lean body mass percentage instead, the result will usually be too high.