Body Composition
Circumference in inches
Converts a tape reading from centimetres to inches. Because the factor cancels in the ratio, the two unit systems return the same WHR.
The Formula
inches = centimetres / 2.54
Converts a tape reading from centimetres to inches. Because the factor cancels in the ratio, the two unit systems return the same WHR.
| Symbol | Meaning | Unit | Notes |
|---|---|---|---|
| cm | Circumference in centimetres | centimetres | 80 cm for the waist and 100 cm for the hip in the worked case. |
| 2.54 | Centimetres per inch | centimetres per inch | Exact by definition; it appears in both numerator and denominator and so cancels in the ratio. |
| in | Circumference in inches | inches | 80 cm becomes 31.496062992125985 in and 100 cm becomes 39.37007874015748 in. |
What Each Symbol Means
cmcentimetres
Circumference in centimetres
80 cm for the waist and 100 cm for the hip in the worked case.
2.54centimetres per inch
Centimetres per inch
Exact by definition; it appears in both numerator and denominator and so cancels in the ratio.
ininches
Circumference in inches
80 cm becomes 31.496062992125985 in and 100 cm becomes 39.37007874015748 in.
See It Worked With Real Numbers
A formula on its own does not tell you which number goes where. The how to calculate waist to hip ratio page applies this equation to a concrete case, shows every intermediate step, and names the mistakes that produce a wrong answer even when the algebra is right.
Where This Formula Appears
This equation is the working core of How To Calculate Waist To Hip Ratio, filed under Health. Every number the guide produces comes from substituting into this one line.