Ideal Weight Calculator
Find your healthy weight range from your height using the NHS healthy BMI band (18.5–24.9), shown in kilograms and stones — plus the Devine formula ideal-weight figure.
Your healthy weight range
NHS healthy BMI 18.5–24.9. In kg & stones.
A guide only and not medical advice. BMI doesn't account for muscle — see NHS — healthy weight.
What is an ideal weight?
There's no single "perfect" weight, but health bodies use a range rather than one number. The NHS defines a healthy weight as a BMI of 18.5 to 24.9, which translates into a weight band for your height. This calculator works out that band in kilograms and stones, and also shows the single Devine formula figure used in medicine. Where you sit within the range depends on your build, muscle and frame.
For a height of 1.70 m, a healthy weight range is about 53.5–72 kg (roughly 8st 6lb to 11st 5lb). The Devine ideal figure for a 1.70 m man is around 66 kg. Treat these as a guide — muscle isn't captured by BMI.
Healthy weight ranges by height
| Height | Healthy range (BMI 18.5–24.9) |
|---|---|
| 1.60 m (5'3") | 47–64 kg |
| 1.70 m (5'7") | 53–72 kg |
| 1.80 m (5'11") | 60–81 kg |
| 1.90 m (6'3") | 67–90 kg |
Based on the NHS healthy BMI band of 18.5–24.9. Source: NHS — healthy weight.
See where you sit
To find out where your current weight lands on the scale, use the BMI calculator, which gives your category. To plan a change, the calorie calculator shows the daily intake to lose, gain or maintain, and the stone to kg converter helps if you weigh in stones but health forms ask for kilograms.
Frequently asked questions
What is my ideal weight for my height?
A healthy weight is usually taken as a BMI between 18.5 and 24.9. For a height of 1.70 m that is roughly 53.5 kg to 72 kg (about 8st 6lb to 11st 5lb). Your ideal point within that range depends on build and muscle.
How is ideal weight calculated?
The simplest method multiplies the healthy BMI range (18.5–24.9) by your height in metres squared to give a weight range. The Devine formula gives a single figure based on height and sex, often used in medicine for drug dosing.
Is BMI the best way to find ideal weight?
BMI is a useful general guide but does not account for muscle, so very muscular people can read as overweight. The NHS uses the 18.5–24.9 range as a healthy band; for a fuller picture also consider waist measurement.
What is the Devine formula?
The Devine formula estimates ideal body weight as 50 kg (men) or 45.5 kg (women) plus 2.3 kg for each inch over 5 feet. It gives a single reference figure and is widely used in clinical settings.
Does ideal weight differ for men and women?
The BMI healthy range is the same for men and women, but formulas like Devine use a lower base figure for women. Body composition differs between sexes, so use these numbers as a guide alongside how you feel and your fitness.