Why Nutrition Calculation Matters
The key to weight management and health isn't just "how much you eat" but "what and how much you eat." Even at the same 2,000 kcal, different ratios of carbs, protein, and fat lead to different outcomes in weight change, muscle mass, and energy levels. Calculating nutrients lets you design a scientifically-based diet plan.
The Three Macronutrients
| Nutrient | Calories/g | Primary Role | Food Sources |
|---|
| Carbohydrates | 4 kcal | Energy supply, brain function | Rice, bread, pasta, fruit, potatoes |
| Protein | 4 kcal | Muscle synthesis, immunity | Meat, fish, eggs, tofu, beans |
| Fat | 9 kcal | Hormone production, cell membranes | Nuts, olive oil, avocado, salmon |
Fat has more than double the calories per gram compared to carbs and protein, so even small amounts can significantly increase calorie intake.
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Daily Calorie Calculator
Find your recommended daily calorie intake
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Nutrient Ratios by Goal
Weight Loss (Fat Reduction)
- Carbs 40% / Protein 30% / Fat 30%
- Daily calories: TDEE minus 300-500 kcal
- Protein: 1.6-2.0g per kg body weight
Muscle Building (Bulking)
- Carbs 50% / Protein 25% / Fat 25%
- Daily calories: TDEE plus 200-400 kcal
- Protein: 1.8-2.2g per kg body weight
General Health Maintenance
- Carbs 50-60% / Protein 15-20% / Fat 20-30%
- Daily calories: Equal to TDEE
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BMR Calculator
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Practical Calculation Example
70kg male, TDEE 2,500 kcal, weight loss goal:
Target Calories: 2,500 - 500 = 2,000 kcal
Carbs (40%): 2,000 × 0.4 = 800 kcal ÷ 4 = 200g
Protein (30%): 2,000 × 0.3 = 600 kcal ÷ 4 = 150g
Fat (30%): 2,000 × 0.3 = 600 kcal ÷ 9 = 67g
150g of protein equals about 600g of chicken breast (roughly 4 portions). Check nutrition labels to meet daily targets.
Sample Korean Daily Meal Plan
| Meal | Menu Example | Calories | C/P/F (g) |
|---|
| Breakfast | Brown rice + 2 eggs + kimchi | ~450kcal | 65/20/12 |
| Lunch | Chicken breast salad + sweet potato | ~500kcal | 55/40/12 |
| Snack | Greek yogurt + handful of nuts | ~250kcal | 15/20/12 |
| Dinner | Grilled salmon + half rice + vegetables | ~550kcal | 40/35/22 |
Daily total: ~1,750 kcal (C: 175g / P: 115g / F: 58g) — a sample diet plan.
Practical Diet Management Tips
- Read nutrition labels: Always check serving size and nutritional info on packaged foods.
- Distribute protein intake: 30-40g per meal across 3-4 meals is more efficient for absorption.
- Reduce processed carbs: Choose whole grains, sweet potatoes, and fruit over white bread and snacks.
- Choose healthy fats: Avoid trans fats; eat unsaturated fats from olive oil, nuts, and fish.
- Stay hydrated: Drink 1.5-2L of water daily. Thirst is often confused with hunger.