📋 Health Information · Editorial Team
Healthy BMI for Women: UK Guide
The NHS healthy range is 18.5 to 24.9 for women and men alike. But what that means in stone, and how to interpret it for a woman's body, deserves a proper explanation.
Medical disclaimer: This article is general information, not medical advice. BMI is a screening tool, not a diagnosis. If you are pregnant, have an eating disorder history, or are concerned about your weight, speak to your GP or midwife rather than relying on charts alone.
The NHS BMI Ranges for Women
The NHS applies the same BMI categories to adult women and men:
| BMI | Category |
|---|---|
| Below 18.5 | Underweight |
| 18.5 - 24.9 | Healthy weight |
| 25 - 29.9 | Overweight |
| 30 and above | Obese |
The ranges do not change with sex, but as we will see, what a given BMI means for a woman's body differs from what it means for a man's. That is where interpretation matters more than the number itself.
Healthy Weight by Height, in Stone
Translating the 18.5 to 24.9 range into stone for common heights:
| Height | Healthy weight (stone) | Healthy weight (kg) |
|---|---|---|
| 5'0" | 6 st 11 - 9 st 2 | 43 - 58 kg |
| 5'2" | 7 st 3 - 9 st 11 | 46 - 62 kg |
| 5'4" | 7 st 10 - 10 st 6 | 49 - 66 kg |
| 5'6" | 8 st 3 - 11 st 0 | 52 - 70 kg |
| 5'8" | 8 st 9 - 11 st 9 | 55 - 74 kg |
| 5'10" | 9 st 2 - 12 st 6 | 58 - 79 kg |
For a visual version covering more heights, see our weight chart for women. To check your own figure precisely, use our BMI calculator.
Why BMI Means Something Different for Women
BMI measures weight against height. It does not measure body composition, and this is where sex matters. Women naturally carry a higher proportion of body fat than men at the same BMI: a healthy body fat range is roughly 20 to 29% for women versus 10 to 20% for men. Some of this is essential fat for hormonal and reproductive health.
The practical consequence: a woman and a man can share a BMI of 24 while having quite different amounts of fat mass and muscle mass. This does not make BMI useless for women, it makes it incomplete. Clinicians treat it as a starting point, then look at waist measurement, fitness, blood pressure, and blood results for the full picture.
It also means muscular women can land in the "overweight" bracket while being perfectly healthy, just as BMI can miss higher body fat in slim but sedentary women. The number is a prompt for a conversation, not the conclusion of one.
Waist Measurement: The Number BMI Misses
Where fat sits matters as much as how much there is. Fat around the middle (visceral fat, around the organs) carries higher health risks than fat on the hips and thighs. NHS guidance flags increased risk above 80 cm (31.5 in) and substantially increased risk above 88 cm (34.6 in) for women.
To measure: find the midpoint between your bottom rib and the top of your hip bone, wrap a tape measure around, and breathe out naturally before reading. A woman with a healthy BMI but a waist above 88 cm, or a higher BMI with a small waist, is getting different information from the two measures, and that is exactly why both are used together.
Pregnancy and Menopause Notes
Pregnancy
Standard BMI categories do not apply during pregnancy. Your midwife calculates your BMI at your booking appointment from your pre-pregnancy or early-pregnancy weight, and uses it to plan your care. A booking BMI above 30 is associated with higher risks of gestational diabetes, high blood pressure, and delivery complications, which is why extra monitoring is offered. It is not a judgment, it is a care pathway.
Menopause
Around menopause, hormonal changes tend to redistribute fat toward the abdomen, even without weight gain on the scale. This means a woman can keep the same BMI through her 50s while her waist measurement and health risk profile change. After menopause, the waist tape arguably matters more than the bathroom scale.
Strength training two to three times a week is particularly valuable here: it preserves the muscle mass that otherwise declines with age and keeps the metabolism healthier at any given BMI. Our BMI chart in stone lets you track where you sit across the years.
Frequently Asked Questions
What is a healthy BMI for a woman in the UK?
The NHS uses the same healthy BMI range for women and men: 18.5 to 24.9. Below 18.5 is underweight, 25 to 29.9 is overweight, and 30 or above is obese.
What is a healthy weight in stone for a 5'6" woman?
For a woman who is 5 ft 6 in, the healthy BMI range of 18.5 to 24.9 works out at roughly 8 stone 3 to 11 stone. See the full height table in the guide for 5'0" to 5'10".
Is BMI accurate for women?
BMI is a useful screening tool but it does not measure body fat directly. Women naturally carry a higher body fat percentage than men at the same BMI, so two people with identical BMIs can have different health profiles. Waist measurement adds important context.
Does BMI work during pregnancy?
No. BMI is calculated from your pre-pregnancy or booking weight, and the standard categories do not apply as pregnancy progresses. Your midwife will track your BMI from your booking appointment and advise on healthy weight gain.
What is a healthy waist size for women?
NHS guidance suggests increased health risk above 80 cm (31.5 in) and substantially increased risk above 88 cm (34.6 in) for women. Where you carry weight matters as much as how much you carry.