What is the BMR for a 51-year-old woman?

The estimated BMR (basal metabolic rate) for a 51-year-old woman of average height and weight is 1336 kcal/day, calculated using the Mifflin-St Jeor equation.

Calorie Guide · Age 51

Calories for a 51-Year-Old Woman

Q: How many calories does a 51-year-old woman need?

A lightly active 51-year-old woman of average weight and height needs approximately 1837 kcal/day to maintain weight. Sedentary needs are around 1603 kcal, and very active around 2305 kcal.

Q: How many calories should a 51-year-old woman eat to lose weight?

A 51-year-old woman should eat approximately 1337 kcal/day to lose about 0.5 kg (1 lb) per week. This is a 500 kcal deficit from the estimated maintenance of 1837 kcal.

BMR, TDEE and exact calorie targets for weight loss, maintenance and muscle gain at age 51.

Calorie Needs at Age 51 — Average Woman

1336

BMR (at rest)

1603

Sedentary TDEE

1837
Lightly active TDEE

2071

Moderately active

1337

Weight loss target

1837

Maintenance

2137

Muscle gain target

How Many Calories Does a 51-Year-Old Woman Need?

Using the Mifflin-St Jeor equation with average US height and weight for a woman aged 51, the resting metabolic rate (BMR) is approximately 1336 kcal/day. With typical daily activity included, total calorie expenditure (TDEE) ranges from 1603 kcal (sedentary) to 2305 kcal (very active).

Age 51 note: After 40, muscle loss (sarcopenia) accelerates if untrained. Strength training 2–3×/week and higher protein intake (1 g/lb) are the most effective countermeasures.

Calorie Targets by Goal

Goal	Daily Calories	Expected Result
🔵 Aggressive weight loss	1087 kcal	~0.75 kg/week
📉 Weight loss	1337 kcal	~0.5 kg/week
✅ Maintenance	1837 kcal	Weight stable
💪 Lean bulk	2137 kcal	~0.25 kg/week
🏋️ Aggressive bulk	2337 kcal	~0.5 kg/week

Calorie Needs by Activity Level

Activity Level	Description	Daily Calories
Sedentary	Desk job, minimal movement	1603 kcal
Lightly active	1–3 workouts/week	1837 kcal
Moderately active	3–5 workouts/week	2071 kcal
Very active	Hard training 6–7 days/week	2305 kcal

How Metabolism Changes Around Age 51

Metabolic rate declines approximately 1–2% per decade after age 30, driven primarily by muscle loss (sarcopenia) rather than any inherent slowdown. At age 51, your BMR of 1336 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 51
41	1386 kcal	+50 kcal
46	1361 kcal	+25 kcal
51	1336 kcal	—
56	1311 kcal	-25 kcal
61	1286 kcal	-50 kcal

Macronutrient Split at 1837 kcal

Macro	% of Calories	Grams/day	Calories
Protein	30%	138 g	552 kcal
Carbohydrates	40%	184 g	736 kcal
Fat	30%	61 g	549 kcal

At age 51, 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.

Get personalized calorie targets based on your exact weight, height and activity level.

Calculate My TDEE →

Frequently Asked Questions

How many calories does a 51-year-old woman need per day?A lightly active 51-year-old woman of average size needs approximately 1837 kcal/day to maintain weight. This ranges from 1603 kcal (sedentary) to 2305 kcal (very active).

How many calories should a 51-year-old woman eat to lose weight?Aim for 1337 kcal/day — a 500 kcal deficit from the 1837 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 51 affect how many calories you burn?Yes. Every decade after 30, BMR drops ~1–2% mainly due to muscle loss. At age 51 the estimated BMR is 1336 kcal — compare to 1441 kcal at age 30. Resistance training largely offsets this decline.

Related Age Guides

Sources

WHO CDC Mifflin-St Jeor (PubMed)