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Your Body Mass Index or BMI should be between 18.5 to 25 for you to be a healthy weight. The number is worked out by dividing your weight in kilograms by your height in metres (squared).

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Working out your BMI can be a useful guide for how much weight you need to lose. Check your weight and height on the chart below to find out your BMI and see what your ideal weight range should be:

BMI Calculator (Imperial - a stone is equivalent to 14lbs)

If you'd like to calculate your BMI yourself, follow these three steps.

  1. Work out your height in metres and multiply the figure by itself
  2. Measure your weight in kilograms
  3. Divide the weight by the height squared (the answer to Q1)

For example, you might be 1.6m (5ft 3in) tall and weigh 65kg (10st 3lb). The calculation would then be:
1.6 x 1.6 = 2.56. BMI would be 65 divided by 2.56 = 25.39.