Method shown
The selected equation and assumptions stay visible.
Carb Depot Calculator
Glycogen depot scenario
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Reference range
How this result is calculated
A clear calculation path based on your inputs.
Inputs usedReview the information used for this result.
Full calculation and sourcesOpen Full calculation and sources to audit the formula, assumptions, fixtures, and interpretation limits.
Versioned calculationFormula v1.0.0
Cross-checked
Supporting outputs expose unit and protocol mistakes.
Actionable
The result links to the next relevant planning task.
Step 1Enter an estimate of skeletal muscle mass.
30 kg muscle storage scenarioStep 2Choose the concentration scenario explicitly.
30 kg muscle storage scenarioStep 3Enter a liver-store and water assumption.
30 kg muscle storage scenarioInterpretation
The calculator does not measure glycogen.
Skeletal-muscle estimates and glycogen concentration assumptions can both be wrong.
Associated water varies and should not be interpreted as fat gain.
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Public verification recordFormula v1.0.0
- Review scope
- Compartment Arithmetic, Kcal Conversion, Hydration Ratio, And Supported Scenario Boundaries.
- Review team
- CalculatorGeek Expert Review Team
- Verified
- 2026-09-27
- Next source review
- 2027-03-27
- Automated fixtures
- 1 cases
Review method
Recompute Muscle glycogen = skeletal muscle mass x entered g/kg; total = muscle + liver; energy = total x 4 kcal/g. independently; verify unit normalization, protocol selection, internal consistency, and invalid boundaries.
Known limitations
- The calculator does not measure glycogen.
- Skeletal-muscle estimates and glycogen concentration assumptions can both be wrong.
- Associated water varies and should not be interpreted as fat gain.
- The energy equivalent is stored carbohydrate energy, not guaranteed usable race energy.
Primary sources
Latest update
2026-09-27 ยท Added complete endurance-suite calculator with verified model, source ledger, premium result, and unified contextual navigation.
Published calculation checks
| Case | Inputs | Expected result |
|---|---|---|
| 30 kg muscle storage scenario | skeletal_muscle_mass_kg=30 kg, muscle_glycogen_g_per_kg=15 gkg, liver_glycogen_grams=100 g, water_per_glycogen=3 ratio | muscle_glycogen_grams=450, total_glycogen_grams=550, associated_water_liters=1.65 |
On this page
Direct answer
The scenario adds muscle glycogen, calculated as muscle mass times concentration, to the entered liver glycogen amount.
Actual glycogen requires specialized measurement and varies with depletion, diet, training status, muscle mass, and protocol.
Plan food quantities separately with the Carb Loading Calculator and race timing with the Race Planner.
How to use the calculator
- Enter an estimate of skeletal muscle mass.
- Choose the concentration scenario explicitly.
- Enter a liver-store and water assumption.
- Use the result as a range-planning model, not a body measurement.
Inputs, outputs, and result meaning
Inputs
- Estimated skeletal muscle mass: Use a measured estimate when available; this is not total lean mass.
- Muscle glycogen concentration scenario: Choose the scenario concentration you intend to model.
- Liver glycogen scenario: Enter a transparent liver-store assumption.
- Associated water assumption: Used only for the water-association scenario.
Outputs
- Total glycogen scenario: A displayed result from the stated method and the entered assumptions.
- Muscle glycogen: A displayed result from the stated method and the entered assumptions.
- Liver glycogen: A displayed result from the stated method and the entered assumptions.
- Energy equivalent: A displayed result from the stated method and the entered assumptions.
- Associated water: A displayed result from the stated method and the entered assumptions.
Formula and methodology
Method: Muscle glycogen = skeletal muscle mass x entered g/kg; total = muscle + liver; energy = total x 4 kcal/g.
This is a scenario model. It intentionally requires storage assumptions rather than inferring a precise depot from body mass.
Worked examples
30 kg muscle at 15 g/kg
Muscle glycogen is 450 g. Adding 100 g liver glycogen gives 550 g total and about 1.65 L associated water at 3 g/g.
Interpretation and limitations
- The calculator does not measure glycogen.
- Skeletal-muscle estimates and glycogen concentration assumptions can both be wrong.
- Associated water varies and should not be interpreted as fat gain.
- The energy equivalent is stored carbohydrate energy, not guaranteed usable race energy.
Frequently asked questions
Can body weight tell me exact glycogen stores?
No. That is why the storage assumptions remain visible.
Why does water appear in the result?
Glycogen is stored with associated water, affecting short-term scale mass.
Is this the same as carb loading?
No. Storage state and dietary intake are connected but not interchangeable calculations.
How should I compare results over time?
Repeat the same protocol, units, equipment setup, and environmental conditions, then review the supporting outputs rather than only the headline number.
Sources and transparency
CalculatorGeek independently recomputed every published fixture on 2026-09-27. Sources establish the equation, protocol, or interpretation boundary; they do not turn an estimate into a laboratory measurement or personalized advice.