Carbohydrate Intake Calculator
Estimate your daily carbohydrate intake in grams from your calorie target and the percentage of calories you want from carbs.
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Your result
250 g/day
Carbohydrates
AI explanation
Formula
Carb grams = calories × percent / 100 / 4Worked example
2000 kcal at 50% from carbs
| Field | Value |
|---|---|
| Daily calorie target | 2000 |
| Percent of calories from carbs | 50 |
| Carbohydrates | 250 |
Assumptions
- Uses the Atwater factor of 4 kcal per gram of carbohydrate.
- A common general guideline is 45-65% of calories from carbohydrate, though individual needs vary with activity level and dietary approach.
- Informational only — not personalized medical or dietary advice.
Frequently asked questions
How many carbs should I eat per day?
General dietary guidelines suggest 45-65% of total calories from carbohydrate, but this varies widely by activity level, goals (e.g. low-carb diets go much lower), and personal tolerance.
Why does this use a percentage of calories instead of a fixed gram target?
Framing carbs as a percentage of your total calorie intake makes it easy to adjust consistently if your calorie target changes for weight loss or gain.
Does this calculator distinguish between simple and complex carbs?
No — it estimates total grams only. Diet quality (fiber-rich, whole-food carbs vs. refined sugar) matters separately from the total amount.
Related calculators
Sources
- Dietary Reference Intakes for Energy, Carbohydrate, Fiber, Fat, Fatty Acids, Cholesterol, Protein, and Amino Acids — National Academies (Institute of Medicine). Effective 01-01-2005, reviewed 13-09-2026.
This calculator provides a general estimate only and does not constitute personalized medical, nutritional, or fitness advice. Consult a registered dietitian for a personalized nutrition plan.
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