Carbohydrate Intake Calculator
This carb calculator shows how many grams of carbohydrates to eat per day, based either on the recommended share of your calories or on how much you train. It's useful for weight loss, low-carb eating, and fuelling endurance exercise.
Health authorities recommend carbohydrates supply 45% to 65% of daily calories (AMDR). For active individuals and athletes, requirements range from 3 to 5 g/kg/day for light activity up to 8 to 12 g/kg/day for intense endurance training.
Recommended Carbohydrate Intake
1200 kcal (50%)Acceptable Macronutrient Distribution Range (AMDR) is 45% to 65% of daily calories.
Energy from Carbs
1200 kcal
50% of total daily intake
RDA Minimum Status
Adequate (≥ 130g)
Institute of Medicine brain glucose floor
Added Sugar Limit
< 60 g / day
Max 10% of calories (< 40–50g)
Nutritional Guidelines Reference
| Standard / Category | Intake Guideline | Context |
|---|---|---|
| RDA Minimum Floor | 130 g / day | Institute of Medicine minimum required for central nervous system and brain glucose |
| General Population (AMDR) | 45% – 65% of kcal | Balanced daily carbohydrate intake range |
| Light Training (< 1 hr/day) | 3 – 5 g/kg/day | Low-intensity skill-based or light fitness activity |
| Moderate Training (~1 hr/day) | 5 – 7 g/kg/day | Standard gym resistance training and cardio |
| High Endurance (1–3 hrs/day) | 6 – 10 g/kg/day | Distance runners, cyclists, triathletes |
| Added Sugar Ceiling | < 60 g / day | Dietary Guidelines: keep added sugars under 10% of total daily calories |
Source: Institute of Medicine Dietary Reference Intakes (DRIs) and ISSN Sports Nutrition Consensus.
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Clinical Equations
WHO, CDC, ACSM & Mifflin-St Jeor
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How to use Carbohydrate Intake Calculator
- 1Enter your daily calorie target or maintenance calorie intake.
- 2Choose your calculation method: % of Total Calories (AMDR) or Athlete Training Load (g/kg).
- 3Adjust your target carb percentage or specify your weekly training volume.
- 4Review your daily grams, calorie share, brain glucose minimum (130g floor), and added sugar threshold.
Carbohydrate requirements for exercise
Carbohydrates are stored as glycogen in liver and muscle tissue, serving as the primary fuel for high-intensity muscular contractions and endurance efforts.
The International Olympic Committee (IOC) recommends 5–7 g/kg for moderate training (~1 hr/day) and 6–10 g/kg for endurance athletes training 1–3 hours daily.
The 130g RDA minimum floor
The National Academies Institute of Medicine established an RDA of 130 g/day for carbohydrates as the baseline amount required to fuel the adult central nervous system and red blood cells without relying heavily on ketosis.
Frequently Asked Questions
How many carbs should I eat a day?
Guidelines suggest 45 to 65% of calories, or about 225 to 325 g on a 2,000 kcal diet.
How many carbs per day to lose weight?
Many people do well with 100 to 150 g, but total calories matter more than carbs alone.
What's the minimum carbs per day?
The RDA is 130 g, the average amount the brain uses; lower intakes are possible under ketosis.
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Scientific Sources & Evidence
- World Health Organization (WHO) — Body Mass Index Classification
- CDC Growth Charts — BMI-for-age LMS Percentiles
- Mifflin et al. (1990) — Basal Metabolic Rate Predictive Equations
- NICE Guideline NG246 — Identification and Management of Overweight and Obesity
- American College of Sports Medicine (ACSM) — Exercise Testing & Prescription
- European Food Safety Authority (EFSA) — Dietary Reference Values for Water