Work in three directions with the general 4 kcal-per-gram carbohydrate energy factor.
Calculate with the Carbohydrate Calculator
Enter the values below. Required fields are checked before results are shown.
Carbohydrate Calculator results
How to use the Carbohydrate Calculator
- Select the requested method and measurement system where available.
- Enter measurements using the units shown in each label.
- Select Calculate or press Enter.
- Review the method, source, assumptions, limitations, and visible safety note.
Worked example
Forty-five percent of 2,000 kcal is 900 kcal, or 225 g carbohydrate.
Understanding the result
This is an arithmetic conversion, not guidance for diabetes or another condition.
Assumptions
- General energy factors are suitable for the estimate.
Limitations
- Net-carbohydrate conventions are not applied.
- Food energy values vary.
Sources and method references
- National Academies dietary energy factors (2005). Uses general 4 kcal/g protein, 4 kcal/g carbohydrate, and 9 kcal/g fat factors.
Frequently asked questions
Does this prescribe carbohydrate intake?
The result is an educational estimate based on the selected method and entered assumptions. Individual measurements, needs, and outcomes vary.
Does CalculatorCheck store inputs from the Carbohydrate Calculator?
No. The calculation runs locally in your browser; entries are not saved, transmitted, or added to the page URL.
Is this medical or dietary advice?
No. It does not diagnose, treat, or prescribe for any condition.