Macro Calculator

The calculator first estimates your Basal Metabolic Rate (BMR) using the Mifflin-St Jeor equation, which calculates baseline energy expenditure. For males, BMR equals (10 × weight in kg) + (6.25 × height in cm) - (5 × age in years) + 5. For females, the constant is adjusted to -161. This baseline is then multiplied by your activity factor to find your Total Daily Energy Expenditure (TDEE). Once your calorie target is established, the tool splits your energy into three essential macronutrients: protein (providing 4 calories per gram), carbohydrates (4 calories per gram), and dietary fats (9 calories per gram).

Let us walk through an example for a 30-year-old male who weighs 80 kg, stands 180 cm tall (1.80 m), and has a moderate activity factor of 1.55. First, we compute his BMR: (10 × 80) + (6.25 × 180) - (5 × 30) + 5 = 800 + 1125 - 150 + 5 = 1,780 calories. Multiplying this by his activity factor (1,780 × 1.55) yields a TDEE of approximately 2,759 calories. To set a balanced macro split, the calculator allocates roughly 30% of calories to protein (207g), 45% to carbohydrates (310g), and 25% to fats (77g), giving you concrete daily targets to hit your fitness objectives.

Consistency is far more critical than extreme precision when tracking macros, so aim to hit your daily ranges rather than stressing over single-digit variances. Invest in a digital kitchen food scale to weigh your ingredients in grams rather than relying on volumetric cups, which can introduce massive errors. Finally, remember to readjust your macro targets every 4 to 6 weeks as your body weight and conditioning progress to avoid hitting a plateau.