What this calculator does
This BMI calculator for women uses the same body mass index formula used for anyone, weight divided by height squared, but keeps the page and the explanation focused on the questions women most often bring to it: what counts as a healthy range, and what BMI does and does not account for.
BMI was developed as a population-level screening tool, not an individual diagnosis. It does not know whether weight is muscle or fat, does not adjust for pregnancy, and does not change with the shifts in body composition that often come with menopause. It is one figure among several, not a verdict on health.
The formula
BMI is weight in kilograms divided by height in metres squared. The WHO bands (underweight, healthy weight, overweight, and three tiers of obesity) sit at fixed BMI thresholds regardless of sex. This calculator also converts those same thresholds back into a healthy weight range in kilograms for the height entered.
| Term | Meaning |
|---|---|
| BMI | Body mass index: weight(kg) / height(m)². |
| Healthy weight range | The weight in kilograms, at the entered height, that falls between a BMI of 18.5 and 24.9. |
| WHO category | The standard band (underweight, healthy weight, overweight, obese classes I-III) that a BMI value falls into. |
The inputs explained
| Field | What to enter |
|---|---|
| Weight (kg) | Current body weight. |
| Height (cm) | Height without shoes. |
| Age (years) | Age, shown alongside the result for context; BMI itself is calculated the same way at any age. |
When to use it
Getting a quick, standard reference point
BMI is still the figure most commonly asked for by GPs, insurers and fitness trackers, so knowing your own number in that standard form is useful even with its limits in mind.
Checking a weight range rather than a single target
The healthy weight range this calculator returns is a band, not a single ideal number, which better reflects that a range of weights can be equally healthy at the same height.
Deciding whether a fuller picture is worth getting
BMI sitting outside the healthy range, particularly alongside other signals like waist measurement, is a reasonable prompt to speak with a doctor rather than a reason to act on BMI alone.
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
BMI across a range of weights at 163 cm
The same height, across a spread of weights.
| Weight | BMI | Category (WHO) |
|---|---|---|
| 50 kg | 18.8 | Healthy weight |
| 55 kg | 20.7 | Healthy weight |
| 60 kg | 22.6 | Healthy weight |
| 65 kg | 24.5 | Healthy weight |
| 70 kg | 26.3 | Overweight |
| 80 kg | 30.1 | Obese class I |
| 90 kg | 33.9 | Obese class I |
Questions
Is BMI calculated differently for women than for men?
No. The formula, weight divided by height squared, and the WHO category thresholds are the same for everyone. What differs is how well BMI reflects body composition, since women on average carry a higher body fat percentage than men at the same BMI.
Does BMI account for pregnancy?
No, and it should not be used to judge weight during pregnancy. Healthy weight gain in pregnancy is tracked against separate guidelines, not the standard BMI bands.
Why might BMI read differently after menopause?
Body composition often shifts after menopause, typically with some loss of muscle and a redistribution of fat, even at a stable weight. BMI cannot detect that shift; it only sees the weight and height numbers entered.
What should I use alongside BMI for a fuller picture?
A waist-to-height or waist-to-hip measurement adds information BMI cannot capture on its own. See the waist-to-hip calculator for that comparison.
For the general-purpose version of this calculation, see the BMI calculator. To look at where weight is carried rather than just its total, use the waist-to-hip calculator.