Dietary guidelines (the AMDR) recommend that 45–65% of your daily calories come from carbohydrate. Since carbs provide 4 calories per gram, this calculator converts your calorie target into grams of carbohydrate, shows the full healthy range, and suggests a daily fiber target.
Reviewed: June 20, 2026 · Author: Naveen P N, Founder — AI Calculator · Verified against: AMDR macronutrient guideline, recomputed in code.
The formula
Carbohydrate and protein each provide 4 calories per gram, versus 9 for fat. To find grams, take the share of calories you want from carbs — somewhere in the 45–65% band — multiply by your total calories, and divide by 4. Most of those carbs should be high-fiber whole foods; a useful fiber target is about 14 grams per 1000 calories.
Worked examples
2000 kcal, balanced 50%:
The 45–65% range at 2000 kcal:
Fiber suggestion (2000 kcal):
At 2500 calories the same 50% target rises to about 313 g of carbs, with a 281–406 g healthy range and roughly 35 g of fiber. Endurance athletes often aim toward 60% to keep glycogen topped up.
Frequently Asked Questions
45–65% of calories (AMDR). On 2000 kcal that's ~225–325 g; 50% ≈ 250 g.
Calories × carb% ÷ 4. 2000 × 0.50 ÷ 4 = 250 g.
Near or below the 45% floor (~225 g on 2000 kcal); stricter plans go lower.
~14 g per 1000 kcal — about 28 g on a 2000-calorie diet.
No — general AMDR-based guidance. See a doctor or dietitian for personalized targets.