A woman who is 5’5″ typically needs between 1,600 and 2,200 calories per day to maintain her weight, depending on her age, current weight, and how active she is. That’s a wide range because a 25-year-old who runs four days a week has very different energy demands than a 55-year-old with a desk job. The numbers below will help you find where you fall.
How Your Maintenance Calories Are Calculated
Your body burns calories just by being alive. Breathing, circulating blood, repairing cells, and keeping your organs running all require energy. This baseline burn is called your basal metabolic rate (BMR), and it accounts for roughly 60 to 75 percent of everything you burn in a day. Physical activity, digestion, and even fidgeting make up the rest.
The most commonly used formula for estimating BMR in women is: 447.593 + (9.247 × weight in kilograms) + (3.098 × height in centimeters) − (4.330 × age in years). For a 5’5″ woman (165.1 cm), that height component stays constant at about 511 calories. What shifts the number is your weight and age.
Here’s what that looks like in practice for a few common profiles at 5’5″:
- 130 lbs, age 30: BMR of roughly 1,370 calories
- 130 lbs, age 50: BMR of roughly 1,283 calories
- 150 lbs, age 30: BMR of roughly 1,454 calories
- 150 lbs, age 50: BMR of roughly 1,367 calories
BMR alone doesn’t tell you how much to eat, though. You need to factor in movement.
Adjusting for Activity Level
To get your total daily calorie needs, you multiply your BMR by an activity factor. The Food and Agriculture Organization of the United Nations classifies these into three broad categories:
- Sedentary or lightly active (factor of 1.4 to 1.69): Office work, light walking, minimal structured exercise
- Moderately active (factor of 1.7 to 1.99): Regular exercise several days a week, or a job that keeps you on your feet
- Very active (factor of 2.0 to 2.4): Intense daily training, physically demanding work, or competitive athletics
Using the middle of each range, here’s what daily calorie needs look like for a 5’5″ woman at 130 pounds:
- Age 30, sedentary: about 1,920 calories
- Age 30, moderately active: about 2,530 calories
- Age 50, sedentary: about 1,800 calories
- Age 50, moderately active: about 2,370 calories
At 150 pounds with the same activity levels, add roughly 100 to 150 calories to each of those numbers. Most women at this height who exercise a few times a week land somewhere around 1,800 to 2,100 calories for maintenance.
How Age Actually Affects Your Metabolism
You’ve probably heard that metabolism tanks in your 30s or 40s. A large study published in Science and covered by Harvard Health found something different. Metabolic rate, when adjusted for body size and composition, stays remarkably stable from age 20 all the way to about 60. The gradual weight gain many women notice in their 30s and 40s is more likely driven by changes in activity, muscle mass, and eating habits than by a metabolic slowdown itself.
After 60, metabolism does genuinely decline, dropping about 0.7 percent per year. By age 90, total energy expenditure is roughly 26 percent lower than in middle age, even accounting for smaller body size. So if you’re under 60, age makes only a modest difference in your calorie needs. Each decade subtracts about 40 to 50 calories from your BMR, which is less than a tablespoon of peanut butter.
Calories for Weight Loss
If your goal is to lose weight, the general approach is to eat fewer calories than your body burns. Cutting about 500 calories per day from your maintenance level typically produces a loss of half a pound to one pound per week, according to the Mayo Clinic. For a sedentary 5’5″ woman maintaining at 1,800 calories, that would mean eating around 1,300 calories daily.
That said, going too low creates problems. Eating fewer than about 1,200 calories a day makes it very difficult to get adequate vitamins, minerals, protein, and fiber from food alone. It also tends to increase fatigue, reduce muscle mass, and trigger stronger hunger signals that make the diet harder to sustain. If a 500-calorie cut would drop you below 1,200, a smaller deficit combined with more physical activity is a safer path to the same result.
Muscle matters here, too. Each pound of muscle burns roughly 5 to 7 calories per day at rest, while fat tissue burns almost nothing. That difference sounds small, but gaining even 5 pounds of muscle through strength training adds up over time and helps preserve your metabolic rate during weight loss.
What Your Healthy Weight Range Looks Like
For context, the healthy BMI weight range for a 5’5″ woman is approximately 114 to 150 pounds, according to the National Heart, Lung, and Blood Institute. That’s a 36-pound spread, which reflects the natural variation in bone structure, muscle mass, and body composition among women of the same height. Someone with more muscle can weigh more and still be perfectly healthy. BMI is a rough screening tool, not a precise measure of individual health.
Where you fall in that range directly affects your calorie needs. A 5’5″ woman at 114 pounds has a BMR about 150 calories lower than one at 150 pounds. That gap widens further once activity is factored in.
Pregnancy and Breastfeeding
Calorie needs increase during pregnancy, particularly in the second and third trimesters, but the increase is more modest than many people expect. Breastfeeding demands more energy than pregnancy itself. The CDC recommends an additional 330 to 400 calories per day for breastfeeding mothers compared to their pre-pregnancy intake. That number shifts based on whether you’re exclusively breastfeeding or supplementing with formula, your activity level, and your body size.
Finding Your Number
The quickest way to estimate your personal calorie needs at 5’5″ is to pick the profile closest to yours from the ranges above and use it as a starting point. If you’re lightly active and in your 30s at a moderate weight, 1,800 to 1,900 calories is a reasonable first estimate for maintenance. Track your weight over two to three weeks eating at that level. If your weight stays stable, you’ve found your maintenance. If it creeps up, trim by 100 to 200 calories. If it drops, you’re already in a deficit.
Online TDEE calculators, including the USDA’s DRI Calculator, can give you a more personalized number by plugging in your exact weight, age, and activity level. Just remember that any calculator gives you an estimate. Your actual needs depend on your unique body composition, genetics, sleep quality, stress levels, and dozens of other variables that no formula fully captures. The number is a starting point, not a verdict.