Free BMI Calculator

Free BMI calculator, BMI formula, BMI chart, BMI scale. BMI healthy weight calculator to determine your healthy weight range

The Body mass index (BMI) is the most commonly used measure of obesity and is the best known healthy weight calculator.  Use our online BMI calculator to check if you are in the healthy weight range.

Adolphe Quetelet was a Belgian mathematician and astronomer, who invented the Quetelet Index in the 1830’s. His investigation started when both the medical profession were beginning to realise that fat was no longer a sign of good health as was previously thought and the insurance industry woke up to the fact that mortality rates from overweight people were very high.

Ancel Keys, an American, became very interested in diet in the post war period in the 20th Century after realising the incidence of heart disease in Americans was far higher than Europeans where food was less available. In 1972, Keys validated the Quetelet Index and it became the Body Mass Index (BMI) as we know today.

What is BMI?

BMI takes an approximation of body fat based on our height and weight, it does not actually measure body fat. It’s a very simple calculation that should only be used as a guide, and takes no account of muscle mass. The body mass index calculation applies to both adult women and men.

Can BMI be used by everyone?

As we said above, BMI does not take into account the composition of your body, so may not always be accurate. For example, athletes and bodybuilders with strong muscles or people who have large body frames could be shown as obese by BMI calculations, but may have very little body fat. A gymnast could be estimated as underweight but not unhealthy. However, for the average person, it is a good measure of whether you have a healthy weight for height ratio. BMI is not accurate for children as they are still developing.

What is a healthy BMI range?

For most people, unless you are a bodybuilder, if your BMI calculation is high, that usually means you are high in body fat. As your body fat and BMI increases, and you are measured as obese (i.e. 30 or above), health risks increase. Being either overweight or obese means you are increasing the risk of having heart disease, diabetes, high blood pressure, stroke, cancer, etc. If this is the case for you, then set out to gain a healthy body weight, which will not only help you to lower the risk of certain health diseases but will help you feel fitter and lead a long healthier life. The challenge is then to maintain a healthy

How to calculate BMI?

When calculating your BMI, below you can use the BMI formula, the BMI chart, our free BMI calculator or the BMI scale.

Body Mass Index Formula – BMI formula:

Imperial Units

The imperial bmi formula takes weight measurements in pounds & height measurements in inches or feet.
1 foot = 12 inches
inches² = inches x inches

BMI =
( lb/in² )
(weight in pounds x 703 )
————————————
height in inches²

Metric Units

The metric bmi formula takes weight measurements in kilograms & height measurements in centimeters or meters.
1 meter = 100cms
meters² = meters x meters

BMI =
( kg/m² )
weight in kilograms
————————————
height in meters²

BMI Chart - Healthy Weight Chart

To use this BMI table you need to know your height in inches. Move over to the right and select your weight in pounds. You can find your BMI at the bottom of that column.

Height
Weight in Pounds
4'10"(58”) 91 96 100 105 110 115 119 124 129 134 138 143 148 153 158 162 167
4'11"(59”) 94 99 104 109 114 119 124 128 133 138 143 148 153 158 163 168 173
5' (60”) 97 102 107 112 118 123 128 133 138 143 148 153 158 163 168 174 179
5'1" (61”) 100 106 111 116 122 127 132 137 143 148 153 158 164 169 174 180 185
5'2" (62”) 104 109 115 120 126 131 136 142 147 153 158 164 169 175 180 186 191
5'3" (63”) 107 113 118 124 130 135 141 146 152 158 163 169 175 180 186 191 197
5'4" (64”) 110 116 122 128 134 140 145 151 157 163 169 174 180 186 192 197 204
5'5" (65”) 114 120 126 132 138 144 150 156 162 168 174 180 186 192 198 204 210
5'6" (66”) 118 124 130 136 142 148 155 161 167 173 179 186 192 198 204 210 216
5'7" (67”) 121 127 134 140 146 153 159 166 172 178 185 191 198 204 211 217 223
5'8" (68”) 125 131 138 144 151 158 164 171 177 184 190 197 203 210 216 223 230
5'9" (69”) 128 135 142 149 155 162 169 176 182 189 196 203 209 216 223 230 236
5'10"(70”) 132 139 146 153 160 167 174 181 188 195 202 209 216 222 229 236 243
5'11"(71”) 136 143 150 157 165 172 179 186 193 200 208 215 222 229 236 243 250
6' (72”) 140 147 154 162 169 177 184 191 199 206 213 221 228 235 242 250 258
6'1" (73”) 144 151 159 166 174 182 189 197 204 212 219 227 235 242 250 257 265
6'2" (74”) 148 155 163 171 179 186 194 202 210 218 225 233 241 249 256 264 272
6'3" (75”) 152 160 168 176 184 192 200 208 216 224 232 240 248 256 264 272 279
BMI 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35





BMI Calculator

To calculate your BMI, enter your weight and height in the BMI calculator below and then click on the “Body Mass Index” box. Your BMI will appear in the BMI box.

BMI Categories:

  • Underweight = <18.5
  • Normal weight = 18.5-24.9
  • Overweight = 25-29.9
  • Obesity = BMI of 30 or greater



Weight:


Height:



Your BMI is:

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Height and Body Weight Conversion Calculator

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Top body mass index scales from Amazon.com

If you use this “body fat water scale” you can get a break down of your body fat, hydration levels, muscle mass and bone index measurements straight away. It stores personal data for up to 8 different users.


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