Carb Intake Calculator
Calculate your daily carbohydrate target in grams from your calorie needs and chosen carb percentage or goal.
By Jonas Lindemann · Updated · How we build our calculators
337g/day
50% of 2695 kcal TDEE
1347
kcal from carbs
4.4
g per kg body weight
Note: Endurance athletes often need 5-8 g/kg, while low-carb dieters may sit under 3 g/kg. Choose a carb share that fits your training volume and goals after protein and fat are set.
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Calculation Method
Carbohydrates are your body's preferred fuel for moderate-to-high intensity exercise and the brain's main energy source. This calculator estimates your daily calories from TDEE (Mifflin-St Jeor), then converts a chosen carbohydrate share of those calories into grams — and shows the equivalent grams per kilogram of body weight so you can sanity-check it against training demands.
The Formula
TDEE = BMR × activity factor
Carb calories = TDEE × carb %
Carb grams = carb calories / 4
Carbohydrate provides 4 kcal per gram. A 45–55% share suits most balanced diets; endurance athletes go higher, low-carb dieters lower.
Worked Example
A 78 kg man with a 2,650 kcal TDEE choosing a 50% carb share:
- Carb calories = 2,650 × 0.50 = 1,325 kcal
- Carb grams = 1,325 / 4 = 331 g
- Per kg = 331 / 78 = 4.2 g/kg
Carb Needs by Training Load
| Activity | g per kg/day |
|---|---|
| Low / general fitness | 3–5 |
| Moderate (1 hr/day) | 5–7 |
| High (1–3 hr/day) | 6–10 |
| Very high (>4 hr/day) | 8–12 |
Setting Your Share
A common approach is to fix protein first (around 1.6–2.2 g/kg) and fat at roughly 20–30% of calories, then let carbohydrates fill the remainder. Favor fiber-rich whole grains, fruit, and vegetables, and time more carbs around hard sessions.
Note: This is an educational estimate, not medical or dietary advice. Optimal carbohydrate intake depends on your sport, metabolism, and health. Consult a registered dietitian or healthcare professional for individualized guidance.
Frequently Asked Questions
It depends on calories and goals. A typical range is 45-65% of calories from carbs (about 200-350 g on a 2,500 kcal diet). Low-carb diets go well below this; endurance athletes often go higher.
Multiply your daily calories by your carb percentage, then divide by 4 (carbs have 4 kcal per gram). For 2,000 kcal at 50% carbs: 1,000 kcal / 4 = 250 g.
No. Carbs are not inherently fattening; total calories drive weight change. Some people prefer lower carbs for appetite control, but adequate carbs fuel training and recovery.