Calculate your BMI

The formula

your BMI is calculated using the formula

Weight in kilograms / (Length in metres x Length in metres)
(703 x Weight in pounds) / (Length in Inch x Length in Inch)

Your child's BMI

The given classifications (Underweight, Ideal, Overweight or Obese) are only apllicable to adults over 18. For anyone under 18 the following index should be used to determine if your child's BMI falls within the `Ideal` classification.

Age  boysgirls
215,14-18,4014,83-18,01
314,74-17,8814,47-17,55
414,43-17,5414,19-17,27
514,21-17,4113,94-17,14
614,07-17,5413,82-17,33
714,04-17,9113,86-17,74
814,15-18,4314,02-18,34
914,44-19,0914,28-19,06
1014,64-19,8314,61-19,85
1114,97-20,5415,05-20,73
1215,35-21,2115,62-21,67
1315,84-21,9016,26-22,57
1416,41-22,6116,88-23,33
1516,98-23,2817,45-23,93
1617,54-23,8917,91-24,36
1718,05-24,4518,25-24,69
1818,50-24,9918,50-24,99

BMI and Pregnancy

Don't use this BMI calculator during -and for quite some time after- your pregnancy. During your pregnancy you should focus on healthy eating and not on your BMI!

More tools

My due date When is your due date? Enter the date of your last period or ovulation and you'll know. (roughly)

My alternative due date A -according to research- more accurate way to determine your due date.

My fertile days Shows your most fertile days and when you can try a home pregnancy test.

Fetus development This interactive movie shows what pregnancy does to your body!

Calculate your BMI Calculate your BMI. (But not during your pregnancy)

Growth charts Keep track of the growth of your child