Mid-parental Height (MPH) Calculations

Mid parental height can be calculated in the following two ways:

MPH calculation (inches):

For girls: ((Father's height - 5 inches) + Mother's height) divided by 2

For boys: ((Mother's height + 5 inches) + Father's height) divided by 2

1 standard deviation (SD) = 2 inches

2 SD = 4 inches

Target height range = mid-parental height +/- 4 inches.

1 inch = 2.54 cm

MPH calculation (centimeters):

For girls: ((Father's height - 13 cm) + Mother's height) divided by 2

For boys: ((Mother's height + 13 inches) + Father's height) divided by 2

1 standard deviation (SD) = 5.1 cm (many clinicians round to 5)

2 SD = 10.2 cm (rounded to 10 cm)

Target height range = mid-parental height +/- 10.2 cm

Based on statistics, it would be expected that 95% of children be within ~2-4 inches above or below this MPH calculation.