How Many Calories Should a Woman Eat to Lose Weight?

Published April 2026

It's one of the most searched nutrition questions, and for good reason: the answer is not a single number. How many calories a woman needs to lose weight depends on her age, height, weight, activity level, hormonal status, and how much weight she wants to lose. This article breaks down the key concepts and gives practical starting estimates.

Understanding BMR and TDEE

Two numbers underpin any calorie goal: your basal metabolic rate (BMR) and your total daily energy expenditure (TDEE).

BMR is the number of calories your body burns at complete rest, just to keep basic functions running: breathing, circulation, cell repair, temperature regulation. For most women, BMR sits between 1,200 and 1,600 calories per day, depending on body size and composition.

TDEE adds everything on top of rest: walking, exercise, digestion, daily movement. Most women's TDEE falls between 1,600 and 2,400 calories depending on how active they are. A sedentary office worker sits at the lower end; a woman who trains several times a week sits at the higher end.

The most widely used formula for estimating BMR is the Mifflin-St Jeor equation, which factors in weight, height, and age. It's more accurate than older formulas and is what most calorie tracking apps use as a baseline.

Setting a Safe Calorie Deficit

To lose fat, you need to consume fewer calories than your TDEE. That gap is called a calorie deficit. A deficit of 300 to 500 calories per day below TDEE is generally considered appropriate for steady fat loss, producing roughly 0.25 to 0.5 kg of weight loss per week.

Most health organisations recommend that women do not go below 1,200 calories per day without medical supervision. Below this threshold, it becomes difficult to meet minimum nutritional requirements for vitamins, minerals, and protein.

Extreme deficits (cutting 1,000+ calories per day) cause problems beyond just hunger. The body responds by slowing metabolism, breaking down muscle tissue for energy, and disrupting hormone production. For women specifically, very low calorie intake can cause menstrual irregularity or cessation, a sign that the body is under significant physiological stress. These effects can persist even after calorie intake returns to normal.

Factors That Affect Calorie Needs

Calorie requirements are not static. Several factors shift them significantly:

Age: Metabolism slows gradually with age, partly because lean muscle mass tends to decline. A 45-year-old woman at the same weight and activity level as her 25-year-old self will generally need fewer calories to maintain her weight.

Activity level: This is the largest variable after body size. An extra hour of moderate exercise can add 300 to 500 calories to daily expenditure, which directly affects how large a deficit you need to create through food.

Muscle mass: Muscle tissue burns more calories at rest than fat tissue. Women who strength train and carry more lean mass have a higher BMR, meaning they can eat more while still losing fat.

Hormonal factors: The menstrual cycle affects hunger and energy expenditure across its phases. Women with PCOS often have insulin resistance that can make weight loss slower. Perimenopause and menopause bring hormonal shifts that tend to reduce BMR and change where the body stores fat, typically shifting to the abdomen.

Pregnancy and breastfeeding: These are not appropriate times to pursue a calorie deficit. Calorie needs increase significantly during pregnancy and remain elevated while breastfeeding. Restricting intake during these periods can affect both maternal health and infant development.

A Practical Starting Point

The following estimates give a reasonable starting range based on activity level. These are not precise prescriptions. Individual variation means some women will lose weight faster or slower than these ranges predict.

Sedentary (desk job, minimal exercise):

Moderately active (light exercise 3 to 4 days per week):

Very active (intense exercise 5 or more days per week, or a physically demanding job):

These ranges are starting points, not fixed targets. Track your intake consistently for two to three weeks, then assess. If you are losing more than 0.5 kg per week, consider adding back 100 to 200 calories. If nothing is moving, a small reduction or an increase in activity may be needed. The data tells you what your body actually needs.

How VitaCal Helps

VitaCal is built around the reality that tracking calories consistently is the hardest part. The app sets a personalised calorie goal based on your stats and targets, so you don't have to do the maths manually. AI photo logging means you can log a meal by taking a photo, with no database searching or weighing required. Over time, the app tracks your intake trends so you can see patterns and make adjustments based on real data rather than guesswork.

If you want a straightforward way to start tracking without the complexity of traditional calorie counting apps, VitaCal is worth trying.

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