BMR, TDEE and exact calorie targets for weight loss, maintenance and muscle gain at age 58.
Using the Mifflin-St Jeor equation with average US height and weight for a man aged 58, the resting metabolic rate (BMR) is approximately 1699 kcal/day. With typical daily activity included, total calorie expenditure (TDEE) ranges from 2038 kcal (sedentary) to 2930 kcal (very active).
| Goal | Daily Calories | Expected Result |
|---|---|---|
| 🔵 Aggressive weight loss | 1586 kcal | ~0.75 kg/week |
| 📉 Weight loss | 1836 kcal | ~0.5 kg/week |
| ✅ Maintenance | 2336 kcal | Weight stable |
| 💪 Lean bulk | 2636 kcal | ~0.25 kg/week |
| 🏋️ Aggressive bulk | 2836 kcal | ~0.5 kg/week |
| Activity Level | Description | Daily Calories |
|---|---|---|
| Sedentary | Desk job, minimal movement | 2038 kcal |
| Lightly active | 1–3 workouts/week | 2336 kcal |
| Moderately active | 3–5 workouts/week | 2633 kcal |
| Very active | Hard training 6–7 days/week | 2930 kcal |
Metabolic rate declines approximately 1–2% per decade after age 30, driven primarily by muscle loss (sarcopenia) rather than any inherent slowdown. At age 58, your BMR of 1699 kcal reflects your current muscle mass, height and hormonal status. The single most effective way to maintain or raise your BMR is resistance training — each kilogram of lean muscle burns roughly 13 kcal/day at rest.
| Age | Estimated BMR (man) | Change vs age 58 |
|---|---|---|
| 48 | 1749 kcal | +50 kcal |
| 53 | 1724 kcal | +25 kcal |
| 58 | 1699 kcal | — |
| 63 | 1674 kcal | -25 kcal |
| 68 | 1649 kcal | -50 kcal |
| Macro | % of Calories | Grams/day | Calories |
|---|---|---|---|
| Protein | 30% | 175 g | 700 kcal |
| Carbohydrates | 40% | 234 g | 936 kcal |
| Fat | 30% | 78 g | 702 kcal |
At age 58, protein intake is especially important. Aim for at least 71–89 g/day to maintain muscle mass, whether you're in a deficit, at maintenance, or in a surplus.
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