The body mass index -- BMI -- formula uses your height and weight to show a rough body fat calculation. Although the calculation is a good indicator for overweight and obesity levels, it should be taken into consideration that muscle is heavier than fat and may skew the percentage. A muscular athlete with very little body fat may have a BMI that is in the overweight range.
Step 1
Step on a scale and record your weight.
Step 2
Measure your height using a tape measure and record the figure.
Step 3
Multiply your weight by 703. Record the answer as "Figure 1"
Step 4
Square your height in inches. To square a number, multiply the number by itself. Record the answer as "Figure 2".
Step 5
Divide Figure 1 by Figure 2. The answer is your BMI.
Step 6
Compare your BMI with the percentage guideline. A BMI that falls between 25.0 and 29.9 percent is considered overweight. A percentage over 30.0 is obese.
Things You'll Need
- Scale
- Tape measure
- Calculator
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