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

A 45-year-old 170 lb woman should eat approximately 1427 kcal/day to lose about 1 lb per week — a 500 kcal deficit from the maintenance estimate of 1927 kcal.

What is the BMI for a 170 lb woman?

At 170 lbs (77.1 kg) and average height (162.6 cm), the BMI is 29.2 — Overweight ⚠️.

Calorie Guide · Age 45 · 170 lbs

Calories for a 45-Year-Old 170 lb Woman

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

A lightly active 45-year-old 170 lb woman of average height needs approximately 1927 kcal/day to maintain weight. This ranges from 1682 kcal (sedentary) to 2417 kcal (very active).

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

Calorie Needs: 45 years old · 170 lbs · Woman

1401

BMR (at rest)

1682

Sedentary TDEE

1927
Lightly active TDEE

2172

Moderately active

1427

Weight loss target

1927

Maintenance

2227

Muscle gain target

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

Using the Mifflin-St Jeor equation with your exact inputs — age 45, weight 170 lbs (77.1 kg), average woman's height (162.6 cm) — the resting metabolic rate is 1401 kcal/day. With typical daily activity, total calorie expenditure (TDEE) ranges from 1682 kcal (sedentary) to 2417 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	1177 kcal	~1.5 lbs/week
📉 Weight loss	1427 kcal	~1 lb/week
✅ Maintenance	1927 kcal	Weight stable
💪 Lean bulk	2227 kcal	~0.5 lbs/week
🏋️ Aggressive bulk	2427 kcal	~1 lb/week

Calorie Needs by Activity Level

Activity Level	Description	Daily Calories
Sedentary	Desk job, minimal movement	1682 kcal
Lightly active	1–3 workouts/week	1927 kcal
Moderately active	3–5 workouts/week	2172 kcal
Very active	Hard training 6–7 days/week	2417 kcal

BMI at 170 lbs

At 170 lbs (77.1 kg) and average height for a woman (162.6 cm), your BMI is 29.2 — Overweight ⚠️. BMI is a useful screening tool but doesn't measure body composition. Waist circumference and muscle mass provide additional context.

Macronutrient Split at 1927 kcal

Macro	% of Calories	Grams/day	Calories
Protein	30%	145 g	580 kcal
Carbohydrates	40%	193 g	772 kcal
Fat	30%	64 g	576 kcal

For weight loss at 1427 kcal/day, increase protein to 35% (125 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 woman eat per day?A lightly active 45-year-old 170 lb woman needs approximately 1927 kcal/day to maintain weight. This ranges from 1682 kcal (sedentary) to 2417 kcal (very active).

How many calories to lose weight at 170 lbs, age 45?Eat 1427 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 1401 kcal vs 1426 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