How many calories should a 45-year-old 170 lb man eat to lose weight?

A 45-year-old 170 lb man should eat approximately 1764 kcal/day to lose about 1 lb per week — a 500 kcal deficit from the maintenance estimate of 2264 kcal.

What is the BMI for a 170 lb man?

At 170 lbs (77.1 kg) and average height (175.3 cm), the BMI is 25.1 — Overweight ⚠️.

Calorie Guide · Age 45 · 170 lbs

Calories for a 45-Year-Old 170 lb Man

Q: How many calories does a 45-year-old 170 lb man need?

A lightly active 45-year-old 170 lb man of average height needs approximately 2264 kcal/day to maintain weight. This ranges from 1976 kcal (sedentary) to 2841 kcal (very active).

Exact BMR, TDEE and calorie targets for a 45-year-old man weighing 170 lbs (77.1 kg).

Calorie Needs: 45 years old · 170 lbs · Man

1647

BMR (at rest)

1976

Sedentary TDEE

2264
Lightly active TDEE

2552

Moderately active

1764

Weight loss target

2264

Maintenance

2564

Muscle gain target

How Many Calories Does a 45-Year-Old 170 lb Man Need?

Using the Mifflin-St Jeor equation with your exact inputs — age 45, weight 170 lbs (77.1 kg), average man's height (175.3 cm) — the resting metabolic rate is 1647 kcal/day. With typical daily activity, total calorie expenditure (TDEE) ranges from 1976 kcal (sedentary) to 2841 kcal (very active).

Age 45 note: After 40, hormonal changes further reduce metabolic rate. Sleep, stress management and strength training become increasingly important for body composition.

Calorie Targets by Goal

Goal	Daily Calories	Expected Result
🔵 Aggressive weight loss	1514 kcal	~1.5 lbs/week
📉 Weight loss	1764 kcal	~1 lb/week
✅ Maintenance	2264 kcal	Weight stable
💪 Lean bulk	2564 kcal	~0.5 lbs/week
🏋️ Aggressive bulk	2764 kcal	~1 lb/week

Calorie Needs by Activity Level

Activity Level	Description	Daily Calories
Sedentary	Desk job, minimal movement	1976 kcal
Lightly active	1–3 workouts/week	2264 kcal
Moderately active	3–5 workouts/week	2552 kcal
Very active	Hard training 6–7 days/week	2841 kcal

BMI at 170 lbs

At 170 lbs (77.1 kg) and average height for a man (175.3 cm), your BMI is 25.1 — Overweight ⚠️. BMI is a useful screening tool but doesn't measure body composition. Waist circumference and muscle mass provide additional context.

Macronutrient Split at 2264 kcal

Macro	% of Calories	Grams/day	Calories
Protein	30%	170 g	680 kcal
Carbohydrates	40%	226 g	904 kcal
Fat	30%	75 g	675 kcal

For weight loss at 1764 kcal/day, increase protein to 35% (154 g/day) to preserve muscle during the deficit. At age 45, protein becomes increasingly important for maintaining metabolic rate.

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Frequently Asked Questions

How many calories should a 45-year-old 170 lb man eat per day?A lightly active 45-year-old 170 lb man needs approximately 2264 kcal/day to maintain weight. This ranges from 1976 kcal (sedentary) to 2841 kcal (very active).

How many calories to lose weight at 170 lbs, age 45?Eat 1764 kcal/day for a 500 kcal deficit — approximately 1 lb of fat loss per week. Recalculate your targets every 4–6 weeks as your weight changes.

Does age 45 significantly affect calorie needs vs age 40?At age 45, BMR is approximately 1647 kcal vs 1672 kcal at age 40 — a difference of 25 kcal/day. This is mainly driven by gradual muscle loss over time, which is largely preventable with resistance training.

Related Calorie Guides

Sources

Mifflin-St Jeor Equation (PubMed) CDC Healthy Weight WHO