What is the BMR for a 66-year-old woman?

The estimated BMR (basal metabolic rate) for a 66-year-old woman of average height and weight is 1261 kcal/day, calculated using the Mifflin-St Jeor equation.

Calorie Guide · Age 66

Calories for a 66-Year-Old Woman

Q: How many calories does a 66-year-old woman need?

A lightly active 66-year-old woman of average weight and height needs approximately 1734 kcal/day to maintain weight. Sedentary needs are around 1513 kcal, and very active around 2175 kcal.

Q: How many calories should a 66-year-old woman eat to lose weight?

A 66-year-old woman should eat approximately 1234 kcal/day to lose about 0.5 kg (1 lb) per week. This is a 500 kcal deficit from the estimated maintenance of 1734 kcal.

BMR, TDEE and exact calorie targets for weight loss, maintenance and muscle gain at age 66.

Calorie Needs at Age 66 — Average Woman

1261

BMR (at rest)

1513

Sedentary TDEE

1734
Lightly active TDEE

1955

Moderately active

1234

Weight loss target

1734

Maintenance

2034

Muscle gain target

How Many Calories Does a 66-Year-Old Woman Need?

Using the Mifflin-St Jeor equation with average US height and weight for a woman aged 66, the resting metabolic rate (BMR) is approximately 1261 kcal/day. With typical daily activity included, total calorie expenditure (TDEE) ranges from 1513 kcal (sedentary) to 2175 kcal (very active).

Age 66 note: After 65, calorie needs drop but protein needs stay high or increase to prevent muscle loss. Aim for 1–1.2 g/kg of protein and stay active to preserve functional strength.

Calorie Targets by Goal

Goal	Daily Calories	Expected Result
🔵 Aggressive weight loss	984 kcal	~0.75 kg/week
📉 Weight loss	1234 kcal	~0.5 kg/week
✅ Maintenance	1734 kcal	Weight stable
💪 Lean bulk	2034 kcal	~0.25 kg/week
🏋️ Aggressive bulk	2234 kcal	~0.5 kg/week

Calorie Needs by Activity Level

Activity Level	Description	Daily Calories
Sedentary	Desk job, minimal movement	1513 kcal
Lightly active	1–3 workouts/week	1734 kcal
Moderately active	3–5 workouts/week	1955 kcal
Very active	Hard training 6–7 days/week	2175 kcal

How Metabolism Changes Around Age 66

Metabolic rate declines approximately 1–2% per decade after age 30, driven primarily by muscle loss (sarcopenia) rather than any inherent slowdown. At age 66, your BMR of 1261 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 66
56	1311 kcal	+50 kcal
61	1286 kcal	+25 kcal
66	1261 kcal	—
70	1241 kcal	-20 kcal
70	1241 kcal	-20 kcal

Macronutrient Split at 1734 kcal

Macro	% of Calories	Grams/day	Calories
Protein	30%	130 g	520 kcal
Carbohydrates	40%	173 g	692 kcal
Fat	30%	58 g	522 kcal

At age 66, 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 66-year-old woman need per day?A lightly active 66-year-old woman of average size needs approximately 1734 kcal/day to maintain weight. This ranges from 1513 kcal (sedentary) to 2175 kcal (very active).

How many calories should a 66-year-old woman eat to lose weight?Aim for 1234 kcal/day — a 500 kcal deficit from the 1734 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 66 affect how many calories you burn?Yes. Every decade after 30, BMR drops ~1–2% mainly due to muscle loss. At age 66 the estimated BMR is 1261 kcal — compare to 1441 kcal at age 30. Resistance training largely offsets this decline.

Related Age Guides

Sources

WHO CDC Mifflin-St Jeor (PubMed)