Accurate calculation of carbohydrate needs for athletes — by weight, activity, goals.

Carbohydrate calculation is a method that allows you to accurately determine how many carbohydrates need to be consumed per day, taking into account the athlete's body weight, training intensity, goals (weight loss, muscle gain, endurance) and individual metabolism.
Carbohydrates are the main energy source for muscles — they are stored in the form of glycogen in muscles and liver. Too low a carbohydrate intake causes fatigue, reduces training effectiveness and slows recovery. Too much — can be converted into fat.
Basic formula: Body weight (kg) × Recommended coefficient = Carbohydrate amount (g/day)
| Activity Level | Coefficient (g/kg) | Example (80 kg) |
|---|---|---|
| Sedentary / low activity | 2–3 g/kg | 160–240 g |
| Moderate (3–4 workouts/week) | 3–5 g/kg | 240–400 g |
| High (5–6 workouts/week) | 5–7 g/kg | 400–560 g |
| Elite / endurance sport | 7–10 g/kg | 560–800 g |
| Weight loss (deficit) | 1.5–2.5 g/kg | 120–200 g |
| Muscle gain (surplus) | 4–6 g/kg | 320–480 g |
Not only how much, but also WHEN you consume carbohydrates — this determines their utilization efficiency.
| Time | Recommendation | Amount | Product Examples |
|---|---|---|---|
| Before training (2–3 h) | Complex carbohydrates + protein | 1–1.5 g/kg | Oatmeal, brown rice, sweet potatoes |
| Before training (30–60 min.) | Easily digestible carbohydrates | 0.5 g/kg | Banana, rice cakes, dates |
| During training (>60 min.) | Fast carbohydrates in liquids | 30–60 g/hr | Isotonic drink, carbohydrate gel |
| Immediately after training | High-GI carbohydrates + protein | 0.8–1.2 g/kg | Protein shake with bananas, white rice |
| Dinner | Complex + fiber | Remainder according to daily norm | Quinoa, amaranth, buckwheat |
Glycemic index (GI) shows how quickly carbohydrates raise blood sugar levels. Glycemic load (GL) = GI × carbohydrate amount (g) / 100 — a more accurate indicator.
| Product | GI (0–100) | GL (serving) | When to Take |
|---|---|---|---|
| Glucose (pure) | 100 | 50 | After training (fast recovery) |
| White rice | 73 | 43 | After Training |
| Banana (ripe) | 62 | 16 | Before / after training |
| Oat flakes | 55 | 13 | Breakfast, before training |
| Sweet potatoes | 44 | 11 | Any time — a stable energy source |
| Brown rice | 50 | 16 | Main meals |
| Quinoa | 53 | 13 | Balanced meals |
| Lentils, beans | 28–32 | 5–7 | Dinner, long-lasting energy |
Carbohydrate cycling (Carb Cycling) strategy:
Individual Adjustments: If you feel fatigue — increase by 10–15%. If fat mass is increasing — decrease by 10–15%. Monitor how you feel, body composition, and athletic performance.
Athletes are often afraid of carbohydrates and consume too little of them. This hinders progress, slows recovery, and increases the risk of injury.
A large portion of carbohydrates in the evening, when the body does not need them. It is better to concentrate them around workouts.
Only white rice and pasta without vegetables — micronutrients and digestive benefits are lost.
Carbohydrate needs during exercise depend on the duration and intensity of the load: the longer and more intensely you work, the larger the proportion of energy obtained from carbohydrate stores. Textbooks provide different recommendations for different types of sport, so there is no single “correct” norm.
Practical principle: the carbohydrate portion should cover training volume, while the remaining portion is allocated to fats and proteins. If you feel fatigue and poor recovery during training, it is worth increasing the carbohydrate portion first, not protein.
Source: Anita Bean, “The Complete Guide to Sports Nutrition” (9th edition); NSCA guide “Guide to Sport and Exercise Nutrition”.
Without a food scale and diary, the error can reach 30–50%. Accuracy matters!
Keep a food diary for at least 2 weeks. What works for your body is individual. Review the results every month and adjust your strategy.
Better 80% optimal nutrition every day than 100% one week and 50% the next. Consistency is the key to long-term results.
What works for your training partner will not necessarily work for you. Genetics, microbiota, hormones — everything is individual.
Do not rely on the scale alone. Measure body circumferences, track strength indicators, and take progress photos every 4 weeks.
Q: Is this strategy suitable for beginners?
A: Yes! Start with the basic principles and gradually incorporate more advanced techniques. The most important thing is to start and be consistent.
Q: How quickly will I see results?
A: The first changes (energy level, well-being) — within 1–2 weeks. Body composition changes — within 4–8 weeks. Sports results — within 8–12 weeks.
Q: Do I need to take supplements for this to work?
A: No! Supplements are only a SUPPLEMENT to a balanced diet and proper training. First sort out your nutrition, sleep, and training — only then think about supplements.