How many calories should a 45-year-old 120 lb man eat to lose weight?

A 45-year-old 120 lb man should eat approximately 1452 kcal/day to lose about 1 lb per week — a 500 kcal deficit from the maintenance estimate of 1952 kcal.

What is the BMI for a 120 lb man?

At 120 lbs (54.4 kg) and average height (175.3 cm), the BMI is 17.7 — Underweight 🔵.

Calorie Guide · Age 45 · 120 lbs

Calories for a 45-Year-Old 120 lb Man

Q: How many calories does a 45-year-old 120 lb man need?

A lightly active 45-year-old 120 lb man of average height needs approximately 1952 kcal/day to maintain weight. This ranges from 1704 kcal (sedentary) to 2449 kcal (very active).

Exact BMR, TDEE and calorie targets for a 45-year-old man weighing 120 lbs (54.4 kg).

Calorie Needs: 45 years old · 120 lbs · Man

1420

BMR (at rest)

1704

Sedentary TDEE

1952
Lightly active TDEE

2201

Moderately active

1452

Weight loss target

1952

Maintenance

2252

Muscle gain target

How Many Calories Does a 45-Year-Old 120 lb Man Need?

Using the Mifflin-St Jeor equation with your exact inputs — age 45, weight 120 lbs (54.4 kg), average man's height (175.3 cm) — the resting metabolic rate is 1420 kcal/day. With typical daily activity, total calorie expenditure (TDEE) ranges from 1704 kcal (sedentary) to 2449 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	1202 kcal	~1.5 lbs/week
📉 Weight loss	1452 kcal	~1 lb/week
✅ Maintenance	1952 kcal	Weight stable
💪 Lean bulk	2252 kcal	~0.5 lbs/week
🏋️ Aggressive bulk	2452 kcal	~1 lb/week

Calorie Needs by Activity Level

Activity Level	Description	Daily Calories
Sedentary	Desk job, minimal movement	1704 kcal
Lightly active	1–3 workouts/week	1952 kcal
Moderately active	3–5 workouts/week	2201 kcal
Very active	Hard training 6–7 days/week	2449 kcal

BMI at 120 lbs

At 120 lbs (54.4 kg) and average height for a man (175.3 cm), your BMI is 17.7 — Underweight 🔵. BMI is a useful screening tool but doesn't measure body composition. Waist circumference and muscle mass provide additional context.

Macronutrient Split at 1952 kcal

Macro	% of Calories	Grams/day	Calories
Protein	30%	146 g	584 kcal
Carbohydrates	40%	195 g	780 kcal
Fat	30%	65 g	585 kcal

For weight loss at 1452 kcal/day, increase protein to 35% (127 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 120 lb man eat per day?A lightly active 45-year-old 120 lb man needs approximately 1952 kcal/day to maintain weight. This ranges from 1704 kcal (sedentary) to 2449 kcal (very active).

How many calories to lose weight at 120 lbs, age 45?Eat 1452 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 1420 kcal vs 1445 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