Based on the Mifflin-St Jeor equation. Adjust based on real-world results over 2–3 weeks.
Your Personalized Next Steps
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What This Tool Does
The BMI & Healthy Weight Calculator is a free, instant tool that gives you a complete picture of your weight and health — not just a number.
⚖️
BMI Score
WHO-standard formula with a visual gauge
📏
Healthy Weight Range
Your personal range based on your height
🔥
Calorie Targets
Daily estimates for losing, maintaining, or gaining
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Next Steps
Personalized recommendations based on your result
How It's Calculated
BMI uses the standard WHO formula: weight (kg) ÷ height (m)²
Calories use the Mifflin-St Jeor equation, the most accurate BMR formula for most adults, multiplied by your activity level.
Body fat % is estimated using the Deurenberg formula, accounting for BMI, age, and gender.
⚠️ For informational purposes only. BMI is a screening tool, not a diagnostic measure. Always consult a licensed healthcare professional before making significant changes to your diet or exercise routine.
Ready to Check Your BMI?
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Last updated: April 13, 2026
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BMI means something different at every stage of a woman's life. A BMI that's perfectly healthy at 28 may carry different implications at 48 — especially after hormonal changes shift body composition. This guide breaks down healthy BMI ranges for women by age group and gives you practical next steps.
What Is BMI?
BMI (Body Mass Index) uses your height and weight to estimate whether you're in a healthy weight range. The WHO defines four categories: Underweight (below 18.5), Normal weight (18.5–24.9), Overweight (25–29.9), and Obese (30+).
⚠️ These are reference guides, not medical diagnoses. Always consult your doctor for personalized advice.
BMI by Decade for Women
In Your 20s
Standard BMI range of 18.5–24.9 applies most directly. Metabolism is at its peak and bone density is still building. A BMI below 18.5 at this age risks bone loss and hormonal disruption.
Focus: Build healthy habits now — they compound for decades.
In Your 30s
Metabolism slows ~1–2% per decade. Muscle mass begins to decline. Stress, reduced sleep, and pregnancy can significantly affect weight. A BMI up to 25.9 may still be consistent with good health.
Focus: Add strength training 2x/week to preserve muscle mass and metabolic rate.
In Your 40s
Perimenopause causes declining estrogen, redistributing fat from hips to abdomen. Abdominal fat increases even without overall weight gain. Waist circumference above 35 inches signals elevated risk regardless of BMI.
Focus: Waist circumference becomes as important as BMI after 40.
In Your 50s and Beyond
After menopause, research shows a slightly higher BMI (22–29) may be protective — especially for bone health. Being underweight after menopause significantly raises fracture and immune risk.
Focus: Don't chase a very low BMI after menopause. Maintain muscle, manage waist circumference.
Limitations of BMI for Women
Doesn't distinguish fat from muscle — fit women may read "overweight"
Ignores fat distribution — abdominal fat is far more dangerous than hip/thigh fat
Doesn't account for bone density — denser bones mean more healthy weight
Varies by ethnicity — Asian women face higher risks at lower BMI thresholds
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Frequently Asked Questions
What is a good BMI for a 40-year-old woman?
For women aged 35–44, a BMI between 19 and 25.9 is generally healthy. A BMI up to 26.9 may be acceptable if other health markers (waist, blood pressure, blood sugar) are normal.
Does healthy BMI change after menopause?
Yes. Postmenopausal women may benefit from a slightly higher BMI (22–29). Being underweight after menopause increases osteoporosis and fracture risk.
How much should a 5'4" woman weigh?
For a woman who is 5'4" (163 cm), the healthy weight range is approximately 110–145 lbs (50–66 kg).
Updated April 2026 · 8 min read
74%
of US adult men are overweight or obese
3%
muscle loss per decade after 30 without exercise
5–10%
weight loss needed to see major health benefits
BMI means something different at every stage of a man's life. Testosterone levels, muscle mass, and metabolic function all change with age — and so does what your BMI actually tells you about your health.
Healthy BMI Chart for Men by Age
Age
Underweight
Healthy
Overweight
Obese
18–24
Below 18.5
18.5–24.9
25–29.9
30+
25–34
Below 18.5
18.5–24.9
25–29.9
30+
35–44
Below 19
19–26.9
27–31.9
32+
45–54
Below 19.5
19.5–27.9
28–32.9
33+
55–64
Below 20
20–28.9
29–33.9
34+
65+
Below 22
22–29.9
30–34.9
35+
⚠️ BMI doesn't account for muscle mass. Muscular men may have a higher BMI without excess body fat. Consult your doctor for personalized advice.
BMI by Decade for Men
In Your 20s
Testosterone is at its peak, supporting higher muscle mass and faster metabolism. Muscle is easiest to build now — strength training in your 20s pays dividends into middle age.
Focus: Build habits now. Consistent training, good sleep, and moderate eating in your 20s reduces risk of weight problems in your 40s and 50s.
In Your 30s
Testosterone begins declining ~1%/year after 30. Metabolism slows, abdominal fat accumulates, and career/family demands often reduce exercise time. Sleep deprivation raises cortisol and promotes fat storage.
Muscle loss accelerates to 3–5% per decade without resistance training. Visceral fat (around organs) increases and carries higher cardiovascular risk. Insulin sensitivity decreases, raising type 2 diabetes risk.
Focus: Waist above 40 inches (102 cm) signals elevated risk regardless of BMI — track this number.
In Your 50s and Beyond
Maintaining muscle becomes the most important factor in metabolic health. A slightly higher BMI (27–29) is associated with lower mortality in men over 65. Being underweight after 60 is more dangerous than being modestly overweight.
Focus: Don't chase a very low BMI. Preserve muscle, maintain cardio fitness, control waist circumference.
Body Fat % Ranges for Men by Age
Age
Athletic
Fitness
Average
Above Avg
20–39
6–13%
14–17%
18–24%
25%+
40–59
6–13%
14–19%
20–27%
28%+
60+
6–13%
14–20%
21–29%
30%+
Calculate Your BMI Now
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Frequently Asked Questions
What is a healthy BMI for a 50-year-old man?
For men aged 45–54, a BMI between 19.5 and 27.9 is generally healthy. Men over 50 can tolerate a slightly higher BMI without increased risk, especially with good cardiovascular fitness and muscle mass.
Is a BMI of 27 bad for a man?
A BMI of 27 is technically "overweight" by WHO standards, but for many men — especially those over 40 or muscular — it may be perfectly healthy. Waist circumference and metabolic markers provide important additional context.
How much should a 5'10" man weigh?
For a man who is 5'10" (178 cm), the healthy weight range is approximately 132–174 lbs (60–79 kg).
Updated April 2026 · 9 min read
The healthy weight ranges below are based on a BMI of 18.5–24.9. Select your gender:
Height
Min Weight
Healthy Range
Max Weight
4'10" (147cm)
88 lbs
88–119 lbs
119 lbs
4'11" (150cm)
91 lbs
91–123 lbs
123 lbs
5'0" (152cm)
95 lbs
95–128 lbs
128 lbs
5'1" (155cm)
100 lbs
100–132 lbs
132 lbs
5'2" (157cm)
104 lbs
104–136 lbs
136 lbs
5'3" (160cm)
107 lbs
107–141 lbs
141 lbs
5'4" (163cm)
110 lbs
110–145 lbs
145 lbs
5'5" (165cm)
114 lbs
114–150 lbs
150 lbs
5'6" (168cm)
118 lbs
118–154 lbs
154 lbs
5'7" (170cm)
121 lbs
121–159 lbs
159 lbs
5'8" (173cm)
125 lbs
125–164 lbs
164 lbs
5'9" (175cm)
129 lbs
129–169 lbs
169 lbs
5'10" (178cm)
132 lbs
132–174 lbs
174 lbs
5'11" (180cm)
136 lbs
136–179 lbs
179 lbs
6'0" (183cm)
140 lbs
140–184 lbs
184 lbs
Height
Min Weight
Healthy Range
Max Weight
5'4" (163cm)
110 lbs
110–145 lbs
145 lbs
5'5" (165cm)
114 lbs
114–150 lbs
150 lbs
5'6" (168cm)
118 lbs
118–154 lbs
154 lbs
5'7" (170cm)
121 lbs
121–159 lbs
159 lbs
5'8" (173cm)
125 lbs
125–164 lbs
164 lbs
5'9" (175cm)
129 lbs
129–169 lbs
169 lbs
5'10" (178cm)
132 lbs
132–174 lbs
174 lbs
5'11" (180cm)
136 lbs
136–179 lbs
179 lbs
6'0" (183cm)
140 lbs
140–184 lbs
184 lbs
6'1" (185cm)
144 lbs
144–189 lbs
189 lbs
6'2" (188cm)
148 lbs
148–194 lbs
194 lbs
6'3" (191cm)
152 lbs
152–200 lbs
200 lbs
6'4" (193cm)
156 lbs
156–205 lbs
205 lbs
⚠️ Based on BMI 18.5–24.9. Your ideal weight may differ based on age, muscle mass, and bone structure.
What Affects Your Ideal Weight?
Age: Healthy weight ranges shift slightly upward after 40, especially for women after menopause
Muscle mass: Muscle is denser than fat — athletic people often weigh more at the same height
Bone density: People with denser bones naturally weigh more
Body frame: Small, medium, and large frames carry weight differently
Ethnicity: Health risk thresholds vary — Asian adults face higher risks at lower BMI thresholds
Beyond the Scale: Better Health Measures
Waist circumference: Women above 35" and men above 40" face elevated metabolic risk
Waist-to-height ratio: Waist should be less than half your height
Body fat %: Women 21–35%, men 8–25% is generally healthy
Our calculator gives your exact healthy weight range based on your height, age, and activity level.
Frequently Asked Questions
How much should a 5'4" woman weigh?
For a woman who is 5'4", the healthy weight range is approximately 110–145 lbs. The midpoint (~127 lbs) is often cited as average, but anywhere in this range is healthy.
What is the ideal weight for a 5'5" woman?
For a woman who is 5'5", the healthy weight range is 114–150 lbs. The right weight within this range depends on muscle mass, bone structure, and age.
How much should I weigh at 5'6"?
For a person who is 5'6", the healthy range is approximately 118–154 lbs. Use the calculator for a personalized result based on your age and activity level.
Can I be healthy above my "ideal" weight range?
Yes — especially if you're physically fit with good metabolic health. The weight chart is a general guideline, not a pass/fail test. Fitness level and metabolic markers often matter more than the scale.
Knowing how many calories you need per day is one of the most powerful tools for managing your weight — whether your goal is to lose, gain, or maintain. Yet most people either have no idea what their number is, or they're working off a generic "2,000 calories a day" figure that may be completely wrong for their body.
This guide explains exactly how to calculate your daily calorie needs, what affects the number, and how to use it to reach your goals.
What Are Maintenance Calories?
Your maintenance calories — also called Total Daily Energy Expenditure (TDEE) — is the number of calories your body needs each day to stay at its current weight. Eat more than this and you gain weight. Eat less and you lose weight.
TDEE is made up of four components:
Basal Metabolic Rate (BMR): Calories burned at rest just to keep you alive — typically 60–75% of TDEE
Physical Activity: Exercise and intentional movement — 15–30% of TDEE
Non-Exercise Activity Thermogenesis (NEAT): Calories burned through daily movement like walking, fidgeting, housework
Thermic Effect of Food (TEF): Energy used to digest food — roughly 10% of TDEE
Key insight: Most people dramatically underestimate their TDEE. A moderately active adult woman typically burns 1,800–2,200 calories/day. A moderately active adult man typically burns 2,200–2,800 calories/day.
How to Calculate Your Daily Calorie Needs
The most accurate widely-used formula is the Mifflin-St Jeor equation, which calculates your BMR and then multiplies it by an activity factor:
For women: BMR = (10 × kg) + (6.25 × cm) − (5 × age) − 161 For men: BMR = (10 × kg) + (6.25 × cm) − (5 × age) + 5
Then multiply BMR by your activity level:
Sedentary (desk job, little exercise) × 1.2
Lightly active (1–3 days/week) × 1.375
Moderately active (3–5 days/week) × 1.55
Very active (6–7 days/week) × 1.725
Extra active (physical job or 2x/day training) × 1.9
Our BMI calculator automatically computes your TDEE using this formula. Just enter your details and you'll get your maintenance calories, plus targets for losing and gaining weight.
Daily Calorie Needs by Age and Gender
Here are approximate maintenance calorie ranges based on the Mifflin-St Jeor equation for moderately active adults at average heights and weights:
Age
Women (moderate activity)
Men (moderate activity)
20–29
1,900–2,100 cal/day
2,400–2,700 cal/day
30–39
1,800–2,000 cal/day
2,300–2,600 cal/day
40–49
1,700–1,950 cal/day
2,200–2,500 cal/day
50–59
1,650–1,900 cal/day
2,100–2,400 cal/day
60–69
1,600–1,850 cal/day
2,000–2,300 cal/day
70+
1,550–1,800 cal/day
1,900–2,200 cal/day
⚠️ These are estimates for moderately active adults at average heights and weights. Your personal TDEE depends on your specific height, weight, activity level, and body composition. Use our calculator for your exact number.
How Many Calories to Lose Weight?
One pound of fat contains approximately 3,500 calories. To lose weight, you need to create a consistent calorie deficit — burning more than you eat.
Never go below 1,200 calories (women) or 1,500 calories (men) — below this, nutrient deficiency and muscle loss become serious risks
A deficit of 500 calories/day is the most commonly recommended starting point — sustainable without causing excessive hunger or muscle loss
Protein intake of 0.7–1g per pound of body weight preserves muscle during a deficit
Larger deficits produce faster weight loss but increase the risk of muscle loss, fatigue, and rebound eating
Combining diet and exercise:
The most sustainable approach combines modest calorie reduction with increased activity. For example: eating 300 calories less per day AND burning 200 extra calories through exercise creates a 500-calorie deficit without feeling severely restricted.
How Many Calories to Gain Weight?
Gaining weight — particularly lean muscle mass — requires eating more than your TDEE in combination with strength training to direct those extra calories toward muscle rather than fat.
Larger surpluses lead to more fat gain relative to muscle gain
A "lean bulk" of 200–300 calories above TDEE maximizes muscle gain while minimizing fat gain
Protein intake of 0.7–1g per pound of body weight is essential for muscle synthesis
5 Common Calorie Mistakes
Underestimating portion sizes: Research consistently shows people underestimate calorie intake by 20–40%. Weighing food with a kitchen scale for even 2 weeks dramatically improves accuracy.
Forgetting liquid calories: Sodas, juices, alcohol, flavored coffees, and smoothies can easily add 300–600 hidden calories per day.
Not adjusting as you lose weight: As you lose weight, your TDEE decreases. What was a 500-calorie deficit at 200 lbs may only be 300 calories at 175 lbs — recalculate every 10–15 lbs lost.
Overestimating exercise calories: Fitness trackers and cardio machines typically overestimate calories burned by 20–30%. Don't eat back all the calories your watch says you burned.
Using a generic 2,000 calorie target: The 2,000 calorie daily value on nutrition labels is an average figure. Your actual maintenance may be 1,600 or 2,600 depending on your size and activity level.
Calculate Your Exact Calorie Target
Enter your details in our free calculator and get your personalized maintenance calories, plus targets for losing or gaining weight.
Frequently Asked Questions
How many calories should I eat a day to lose weight?
Subtract 500 from your TDEE (maintenance calories) to lose approximately 1 lb per week. For most women this means 1,300–1,700 calories/day. For most men, 1,700–2,200 calories/day. Never go below 1,200 (women) or 1,500 (men).
How many calories do I need a day?
It depends on your height, weight, age, and activity level. Moderately active women typically need 1,800–2,100 calories/day to maintain weight. Moderately active men typically need 2,200–2,700 calories/day. Use our calculator for your personal number.
Is 1,200 calories a day enough?
1,200 calories per day is the generally accepted minimum for women to get adequate nutrition. For most women it creates a significant deficit and will produce weight loss, but it can be difficult to sustain and may cause muscle loss without adequate protein intake.
Why am I not losing weight in a calorie deficit?
The most common reasons: underestimating actual calorie intake (portion sizes are often larger than people think), overestimating exercise calories burned, metabolic adaptation after extended dieting, or water retention masking fat loss. Track food for 2 weeks using a kitchen scale to get accurate data.
Do calories matter more than carbs or fat?
For weight management, total calorie balance is the primary driver — not macronutrient ratios. However, protein intake significantly affects muscle preservation and satiety. A high-protein approach within your calorie target produces better body composition results than the same calories with low protein.