What is the BMR for a 33-year-old woman?

The estimated BMR (basal metabolic rate) for a 33-year-old woman of average height and weight is 1426 kcal/day, calculated using the Mifflin-St Jeor equation.

Calorie Guide · Age 33

Calories for a 33-Year-Old Woman

Q: How many calories does a 33-year-old woman need?

A lightly active 33-year-old woman of average weight and height needs approximately 1961 kcal/day to maintain weight. Sedentary needs are around 1711 kcal, and very active around 2460 kcal.

Q: How many calories should a 33-year-old woman eat to lose weight?

A 33-year-old woman should eat approximately 1461 kcal/day to lose about 0.5 kg (1 lb) per week. This is a 500 kcal deficit from the estimated maintenance of 1961 kcal.

BMR, TDEE and exact calorie targets for weight loss, maintenance and muscle gain at age 33.

Calorie Needs at Age 33 — Average Woman

1426

BMR (at rest)

1711

Sedentary TDEE

1961
Lightly active TDEE

2210

Moderately active

1461

Weight loss target

1961

Maintenance

2261

Muscle gain target

How Many Calories Does a 33-Year-Old Woman Need?

Using the Mifflin-St Jeor equation with average US height and weight for a woman aged 33, the resting metabolic rate (BMR) is approximately 1426 kcal/day. With typical daily activity included, total calorie expenditure (TDEE) ranges from 1711 kcal (sedentary) to 2460 kcal (very active).

Age 33 note: Metabolism remains strong through your late twenties. This is the best window to build lean muscle mass — it raises your resting BMR long-term.

Calorie Targets by Goal

Goal	Daily Calories	Expected Result
🔵 Aggressive weight loss	1211 kcal	~0.75 kg/week
📉 Weight loss	1461 kcal	~0.5 kg/week
✅ Maintenance	1961 kcal	Weight stable
💪 Lean bulk	2261 kcal	~0.25 kg/week
🏋️ Aggressive bulk	2461 kcal	~0.5 kg/week

Calorie Needs by Activity Level

Activity Level	Description	Daily Calories
Sedentary	Desk job, minimal movement	1711 kcal
Lightly active	1–3 workouts/week	1961 kcal
Moderately active	3–5 workouts/week	2210 kcal
Very active	Hard training 6–7 days/week	2460 kcal

How Metabolism Changes Around Age 33

Metabolic rate declines approximately 1–2% per decade after age 30, driven primarily by muscle loss (sarcopenia) rather than any inherent slowdown. At age 33, your BMR of 1426 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 33
23	1476 kcal	+50 kcal
28	1451 kcal	+25 kcal
33	1426 kcal	—
38	1401 kcal	-25 kcal
43	1376 kcal	-50 kcal

Macronutrient Split at 1961 kcal

Macro	% of Calories	Grams/day	Calories
Protein	30%	147 g	588 kcal
Carbohydrates	40%	196 g	784 kcal
Fat	30%	65 g	585 kcal

At age 33, 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 33-year-old woman need per day?A lightly active 33-year-old woman of average size needs approximately 1961 kcal/day to maintain weight. This ranges from 1711 kcal (sedentary) to 2460 kcal (very active).

How many calories should a 33-year-old woman eat to lose weight?Aim for 1461 kcal/day — a 500 kcal deficit from the 1961 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 33 affect how many calories you burn?Yes. Every decade after 30, BMR drops ~1–2% mainly due to muscle loss. At age 33 the estimated BMR is 1426 kcal — compare to 1441 kcal at age 30. Resistance training largely offsets this decline.

Related Age Guides

Sources

WHO CDC Mifflin-St Jeor (PubMed)