Feet portion of your height
Enter feet (3–8).
Inches (0–11)
Enter inches (0–11).
Your weight in lbs
Enter weight (50–700 lbs).
Your BMI
--
--
⚠️ Medical Disclaimer: BMI is a screening tool, not a diagnostic measure. It does not directly measure body fat and may not accurately reflect health for athletes, older women, or women of Asian descent. This calculator is not a substitute for professional medical advice. Always consult your healthcare provider for personalised health guidance.
Was this calculator helpful?
Sources & Methodology
This calculator uses the WHO and CDC standard BMI formula. Both the metric and imperial formulas are verified against the NHLBI BMI calculator and CDC Adult BMI Calculator. All BMI category thresholds follow the 2000 WHO publication on obesity.
World Health Organization (WHO) — Obesity and Overweight
The WHO defines BMI categories for adults: underweight <18.5, normal weight 18.5–24.9, overweight 25–29.9, obese ≥30. The formula BMI = weight(kg)/height(m)² is the WHO standard. The 2004 WHO Asian BMI thresholds (overweight ≥23, obese ≥27.5) are also referenced.
Centers for Disease Control and Prevention (CDC) — Adult BMI Calculator
The CDC adult BMI calculator uses the same formula and thresholds as the WHO. The imperial conversion factor of 703 is the CDC-documented multiplier for converting lbs/in² to kg/m². Formula: BMI = (weight_lbs / height_in²) × 703.
National Heart, Lung, and Blood Institute (NHLBI) — Calculate Your BMI
The NHLBI confirms the standard healthy BMI range of 18.5–24.9 for adult women and men, and states that BMI is a screening tool that should be considered alongside other health indicators, not used in isolation.
Metric: BMI = weight(kg) / [height(m)]²
Imperial: BMI = [weight(lbs) / height(in)²] × 703
Metric example: 63 kg, 165 cm (1.65 m): BMI = 63 / (1.65)² = 63 / 2.7225 = 23.1
Imperial example: 140 lbs, 5’5" (65 in): BMI = (140 / 65²) × 703 = (140/4225) × 703 = 23.3
Both formulas produce equivalent results (minor difference due to unit conversion rounding).
Imperial example: 140 lbs, 5’5" (65 in): BMI = (140 / 65²) × 703 = (140/4225) × 703 = 23.3
Both formulas produce equivalent results (minor difference due to unit conversion rounding).
Last reviewed: April 2026. Formula sources: WHO 2000, CDC 2024, NHLBI.
BMI for Women — Complete Guide to Body Mass Index, Healthy Ranges & Limitations
Body Mass Index (BMI) is the most widely used screening tool for adult weight classification worldwide. Developed by Belgian mathematician Adolphe Quetelet in the 1830s and adopted by the WHO as an obesity screening measure in the 1990s, it uses a simple ratio of weight to height to estimate whether an individual is at a healthy weight. While the formula is identical for women and men, the interpretation has important sex-specific nuances that most BMI calculators fail to address.
How BMI Is Calculated — The WHO Standard Formula
The BMI formula divides weight by the square of height. In metric units: BMI = weight(kg) / height(m)². In imperial units, the formula is BMI = (weight_lbs / height_in²) × 703, where 703 is the conversion factor between kg/m² and lb/in². The result is a dimensionless number that places individuals into weight categories.
BMI = weight(kg) / height(m)² [WHO standard, 2000]
A woman weighing 63 kg at 165 cm: BMI = 63 / 1.65² = 63 / 2.7225 = 23.1 (Normal weight)
A woman weighing 185 lb at 5’6" (66 in): BMI = (185 / 66²) × 703 = (185/4356) × 703 = 29.9 (Overweight)
The same formula applies to all adult women regardless of age, ethnicity, or fitness level.
A woman weighing 185 lb at 5’6" (66 in): BMI = (185 / 66²) × 703 = (185/4356) × 703 = 29.9 (Overweight)
The same formula applies to all adult women regardless of age, ethnicity, or fitness level.
BMI Categories for Women — WHO and Asian Thresholds
| BMI Range | Category (WHO Standard) | Asian Threshold | Health Risk |
|---|---|---|---|
| Below 18.5 | Underweight | Below 18.5 | Increased (malnutrition, bone loss) |
| 18.5 – 22.9 | Normal Weight (lower) | 18.5–22.9 | Low |
| 23.0 – 24.9 | Normal Weight (upper) | Overweight risk | Low (Standard) / Moderate (Asian) |
| 25.0 – 29.9 | Overweight | Overweight | Moderate |
| 30.0 – 34.9 | Obese Class I | Obese (27.5+) | High |
| 35.0 – 39.9 | Obese Class II | Obese Class II | Very High |
| 40.0+ | Obese Class III | Obese Class III | Extremely High |
Why BMI Is Different for Women — Sex-Specific Considerations
Although the BMI formula is the same for both sexes, women typically carry 10–12% more body fat than men at an equivalent BMI. This is primarily driven by estrogen, which promotes fat storage in the hips, thighs, and breasts for reproductive function. A woman with a BMI of 22 has a higher body fat percentage than a man with the same BMI, yet both are classified identically as normal weight. This biological reality means that BMI may slightly underestimate women's metabolic health risk in some cases, and overestimate it in others (such as athletic women with high muscle mass).
- Hormonal influence: Estrogen increases fat storage, particularly subcutaneous (under-skin) fat in hips and thighs. This fat distribution is generally less metabolically harmful than visceral abdominal fat.
- Menopause effects: After menopause, declining estrogen often causes fat redistribution from hips and thighs to the abdomen. Abdominal fat carries higher cardiovascular risk. BMI cannot capture this shift.
- Muscle mass: Athletic women may be classified as overweight by BMI despite excellent health, because muscle is denser than fat. A female athlete with significant muscle mass and low body fat could have a BMI of 26–28.
- Asian descent: Women of Asian descent tend to develop diabetes and cardiovascular risk at lower BMI values. WHO Expert Consultation recommends lower thresholds: overweight at BMI 23, obese at 27.5.
💡 Pregnancy note: Standard BMI is not appropriate during pregnancy. Use your pre-pregnancy BMI for reference. The Institute of Medicine recommends different weight gain targets based on pre-pregnancy BMI: underweight women should gain 28–40 lbs, normal weight 25–35 lbs, overweight 15–25 lbs, obese 11–20 lbs. Do not attempt to maintain or reduce BMI during pregnancy.
Healthy Weight Range for Women by Height
The healthy weight range corresponds to a BMI of 18.5–24.9. The table below shows the healthy weight range for common heights, helping women set realistic weight goals based on the standard WHO healthy BMI range.
| Height | Healthy Weight Range (BMI 18.5–24.9) | Midpoint (Ideal) | Overweight Starts At |
|---|---|---|---|
| 5’0" / 152 cm | 97–127 lbs / 44–58 kg | 112 lbs / 51 kg | 128 lbs / 58 kg |
| 5’2" / 157 cm | 104–135 lbs / 47–61 kg | 120 lbs / 54 kg | 136 lbs / 62 kg |
| 5’4" / 163 cm | 110–144 lbs / 50–65 kg | 127 lbs / 58 kg | 145 lbs / 66 kg |
| 5’5" / 165 cm | 114–149 lbs / 52–68 kg | 132 lbs / 60 kg | 150 lbs / 68 kg |
| 5’6" / 168 cm | 118–154 lbs / 54–70 kg | 136 lbs / 62 kg | 155 lbs / 70 kg |
| 5’7" / 170 cm | 121–159 lbs / 55–72 kg | 140 lbs / 64 kg | 160 lbs / 73 kg |
| 5’8" / 173 cm | 125–164 lbs / 57–74 kg | 145 lbs / 66 kg | 165 lbs / 75 kg |
| 5’9" / 175 cm | 129–169 lbs / 59–77 kg | 149 lbs / 68 kg | 170 lbs / 77 kg |
⚠️ BMI limitations for women: BMI is a population-level screening tool, not an individual health diagnostic. It does not measure body fat percentage, fat distribution, muscle mass, bone density, or metabolic health. A woman with a BMI of 26 who exercises regularly and eats well may be healthier than a woman with a BMI of 22 who is sedentary. Always interpret BMI alongside other health indicators including waist circumference, blood pressure, cholesterol, and blood glucose.
Frequently Asked Questions
A healthy BMI for adult women is 18.5–24.9 per WHO and CDC guidelines. This is the same range as men. However, women naturally carry about 10% more body fat than men at the same BMI. Below 18.5 is underweight, 25–29.9 is overweight, and 30+ is obese. For women of Asian descent, overweight may start at BMI 23 per some health guidelines.
BMI formula is the same for women and men. Metric: BMI = weight(kg) / height(m)². Imperial: BMI = (weight_lbs / height_inches²) × 703. Example: 140 lbs, 5’5" (65 in): BMI = (140/65²) × 703 = (140/4225) × 703 = 23.3 (Normal weight).
The calculation formula is identical. The health interpretation differs because women carry approximately 10% more body fat at the same BMI due to estrogen and reproductive physiology. Despite this, the WHO and CDC use the same category thresholds for both sexes. A woman and man with the same BMI have different body fat percentages, but are placed in the same weight category.
Overweight depends on height. Overweight begins at BMI 25. For a 5’4" woman, overweight starts at 145 lbs. For 5’5", it starts at 150 lbs. For 5’7", it starts at 160 lbs. Use this calculator to find the exact overweight threshold for your height in pounds or kilograms.
The WHO and CDC standard range of 18.5–24.9 applies regardless of age. However, research suggests women over 65 may have better health outcomes at BMI 23–27 because underweight risk increases significantly with age (bone density loss, muscle loss, frailty). Women aged 20–65 should aim for 18.5–24.9. Women 65+ should discuss their ideal range with their doctor.
No. Standard BMI is not appropriate during pregnancy. Weight gain is expected and necessary. The Institute of Medicine recommends 25–35 lbs gain for normal weight women, 28–40 lbs for underweight, 15–25 lbs for overweight, and 11–20 lbs for obese women. Use your pre-pregnancy BMI for reference only. Consult your doctor or midwife for pregnancy weight guidance.
Obesity begins at BMI 30 for standard WHO thresholds. Class I: 30–34.9, Class II: 35–39.9, Class III (severe): 40+. Women of Asian descent may be considered obese at BMI 27.5 per some health guidelines. Obesity significantly raises the risk of type 2 diabetes, heart disease, certain cancers, and joint problems.
Ideal weight corresponds to the midpoint of the healthy BMI range (18.5–24.9) and varies by height. For a 5’4" woman: ideal range 110–144 lbs, midpoint ~127 lbs. For 5’5": range 114–149 lbs, midpoint ~132 lbs. For 5’7": range 121–159 lbs, midpoint ~140 lbs. This calculator shows your exact healthy range and midpoint based on your height.
Women carry approximately 10% more body fat than men at the same BMI primarily due to estrogen, which promotes fat storage in hips, thighs, and breasts for reproductive function. Women also typically have less absolute muscle mass than men of equivalent height and weight, so more of their body weight comes from fat tissue. This is biologically normal and expected, not a sign of poor health.
In 2004, a WHO Expert Consultation found that people of Asian descent develop diabetes and cardiovascular risk at lower BMI values. Alternative thresholds: overweight starts at BMI 23 (vs. 25 standard) and obese at 27.5 (vs. 30 standard). If you are of Asian descent, discuss these thresholds with your doctor for more accurate health risk assessment.
Yes. BMI has significant limitations. It does not measure body fat directly or account for muscle mass (athletic women may show as overweight), fat distribution (abdominal fat is more dangerous than hip/thigh fat), bone density, or menopausal changes. BMI is a population screening tool, not an individual health diagnostic. Always interpret alongside waist circumference, blood pressure, and other clinical measures.
Use this calculator — it shows exactly how many lbs or kg to reach BMI 24.9 (top of normal). Example: a 5’5" woman at 175 lbs (BMI 29.1) needs to lose 25 lbs to reach 150 lbs (BMI 24.9). A safe, sustainable weight loss rate of 1–2 lbs per week means 13–25 weeks to reach normal BMI, without extreme restriction.
Related Calculators
Popular Calculators
Stripe Fee Calculator
Finance
Pain & Suffering
Legal
TDEE Calculator
Health
Roofing Calculator
Construction
GPA Calculator
Education
Mortgage Refinance
Finance
CPM Calculator
Marketing
Markup Calculator
Finance
Pulmonary Artery Pressure Calculator
Health
Veterinary Cost Estimator
Health
Vo2 Max Calculator
Health
Bid Ask Calculator
Health