What is the BMR for a 39-year-old woman?

The estimated BMR (basal metabolic rate) for a 39-year-old woman of average height and weight is 1396 kcal/day, calculated using the Mifflin-St Jeor equation.

Calorie Guide · Age 39

Calories for a 39-Year-Old Woman

Q: How many calories does a 39-year-old woman need?

A lightly active 39-year-old woman of average weight and height needs approximately 1920 kcal/day to maintain weight. Sedentary needs are around 1675 kcal, and very active around 2408 kcal.

Q: How many calories should a 39-year-old woman eat to lose weight?

A 39-year-old woman should eat approximately 1420 kcal/day to lose about 0.5 kg (1 lb) per week. This is a 500 kcal deficit from the estimated maintenance of 1920 kcal.

BMR, TDEE and exact calorie targets for weight loss, maintenance and muscle gain at age 39.

Calorie Needs at Age 39 — Average Woman

1396

BMR (at rest)

1675

Sedentary TDEE

1920
Lightly active TDEE

2164

Moderately active

1420

Weight loss target

1920

Maintenance

2220

Muscle gain target

How Many Calories Does a 39-Year-Old Woman Need?

Using the Mifflin-St Jeor equation with average US height and weight for a woman aged 39, the resting metabolic rate (BMR) is approximately 1396 kcal/day. With typical daily activity included, total calorie expenditure (TDEE) ranges from 1675 kcal (sedentary) to 2408 kcal (very active).

Age 39 note: Metabolism begins slowing ~1–2% per decade after 30. Maintaining muscle through resistance training and adequate protein (0.7–1 g/lb) offsets most of this decline.

Calorie Targets by Goal

Goal	Daily Calories	Expected Result
🔵 Aggressive weight loss	1170 kcal	~0.75 kg/week
📉 Weight loss	1420 kcal	~0.5 kg/week
✅ Maintenance	1920 kcal	Weight stable
💪 Lean bulk	2220 kcal	~0.25 kg/week
🏋️ Aggressive bulk	2420 kcal	~0.5 kg/week

Calorie Needs by Activity Level

Activity Level	Description	Daily Calories
Sedentary	Desk job, minimal movement	1675 kcal
Lightly active	1–3 workouts/week	1920 kcal
Moderately active	3–5 workouts/week	2164 kcal
Very active	Hard training 6–7 days/week	2408 kcal

How Metabolism Changes Around Age 39

Metabolic rate declines approximately 1–2% per decade after age 30, driven primarily by muscle loss (sarcopenia) rather than any inherent slowdown. At age 39, your BMR of 1396 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 (woman)	Change vs age 39
29	1446 kcal	+50 kcal
34	1421 kcal	+25 kcal
39	1396 kcal	—
44	1371 kcal	-25 kcal
49	1346 kcal	-50 kcal

Macronutrient Split at 1920 kcal

Macro	% of Calories	Grams/day	Calories
Protein	30%	144 g	576 kcal
Carbohydrates	40%	192 g	768 kcal
Fat	30%	64 g	576 kcal

At age 39, protein intake is especially important. Aim for at least 60–74 g/day to maintain muscle mass, whether you're in a deficit, at maintenance, or in a surplus.

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Frequently Asked Questions

How many calories does a 39-year-old woman need per day?A lightly active 39-year-old woman of average size needs approximately 1920 kcal/day to maintain weight. This ranges from 1675 kcal (sedentary) to 2408 kcal (very active).

How many calories should a 39-year-old woman eat to lose weight?Aim for 1420 kcal/day — a 500 kcal deficit from the 1920 kcal maintenance estimate — to lose approximately 0.5 kg per week. Never go below 1200 kcal (women) or 1500 kcal (men) for extended periods.

Does age 39 affect how many calories you burn?Yes. Every decade after 30, BMR drops ~1–2% mainly due to muscle loss. At age 39 the estimated BMR is 1396 kcal — compare to 1441 kcal at age 30. Resistance training largely offsets this decline.

Related Age Guides

Sources

WHO CDC Mifflin-St Jeor (PubMed)