Calculate skeletal muscle glycogen from body weight, muscle mass percentage, and glycogen per kg of muscle, with results in g, mg, or kg.
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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} * (Muscle\ Mass\ \% / 100)Muscle\ Glycogen_g = Muscle\ Mass_{kg} * Glycogen\ per\ kg\ of\ Muscle_{g/kg}Combined into one formula:
Muscle\ Glycogen_g = Body\ Weight_{kg} * (Muscle\ Mass\ \% / 100) * Glycogen\ per\ kg\ of\ Muscle_{g/kg}- Muscle Glycogeng is the estimated amount of glycogen stored in skeletal muscle, in grams.
- Body Weightkg 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 Muscleg/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 * (40 / 100) = 32\ kg
Muscle\ Glycogen = 32 * 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 * 0.453592 = 81.6466\ kgMuscle\ Mass = 81.6466 * (38 / 100) = 31.0257\ kg
Muscle\ Glycogen = 31.0257 * 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.
