Estimate Birth Weight Calculator

Expectant parents often wonder about the birth weight of their baby. While birth weight is influenced by various factors, including genetics, one way to estimate it is by considering the heights of the parents. This Estimate Birth Weight Calculator is a simple tool that provides an estimate of your baby’s birth weight based on the heights of both the mother and the father.


The formula used in this calculator is straightforward. For a baby boy, the estimated birth weight is calculated as the average of the mother’s height and the father’s height, plus 13. For a baby girl, it’s the average of the two heights, minus 13. This formula is a simplified approximation and may not be entirely accurate, as birth weight depends on various factors, including genetics, nutrition, and maternal health.

How to Use

Using the Estimate Birth Weight Calculator is easy. Follow these simple steps:

  1. Select the gender of the baby, either “Male” or “Female.”
  2. Enter the mother’s height in centimeters.
  3. Enter the father’s height in centimeters.
  4. Click the “Calculate” button.

The calculator will then display the estimated birth weight in grams based on the provided information.


Let’s consider an example. If the parents are expecting a baby boy and the mother’s height is 165 cm while the father’s height is 180 cm, the estimated birth weight would be:

Estimated Birth Weight = (165 + 180 + 13) / 2 = 358 grams


  1. Is this calculator accurate?
    • This calculator provides a rough estimate based on parental heights but may not be entirely accurate. It’s essential to consult with a healthcare professional for a more precise assessment.
  2. What other factors influence birth weight?
    • Birth weight is influenced by genetics, maternal health, nutrition, and various other factors. Parental heights are just one aspect.
  3. Can I use this calculator during pregnancy?
    • Yes, you can use this calculator at any stage of pregnancy to get an estimate of your baby’s birth weight.
  4. Does the baby’s gender affect birth weight estimation?
    • Yes, the estimated birth weight differs for male and female babies based on their parents’ heights.
  5. What units should I use for height (cm or inches)?
    • Please enter the heights in centimeters (cm) for accurate results.
  6. Is the calculator suitable for twins or multiple pregnancies?
    • This calculator is designed for singleton pregnancies and may not be accurate for multiple pregnancies.
  7. What if I don’t know the exact heights of the parents?
    • It’s best to provide accurate height measurements for the most reliable estimate. If you’re unsure, consult with a healthcare professional.
  8. Can I rely on this estimate for birth planning?
    • While this estimate can provide some insight, it should not be the sole basis for birth planning. Always consult with your healthcare provider for comprehensive guidance.
  9. Is there any harm in using this calculator?
    • No, there is no harm in using this calculator for estimation. It’s meant to provide general information and is not a diagnostic tool.
  10. Can I use this calculator for same-sex couples?
    • Yes, this calculator can be used by same-sex couples as well, with one parent’s height representing the mother and the other the father.


The Estimate Birth Weight Calculator offers a simple way for expectant parents to get an estimate of their baby’s birth weight based on parental heights. Keep in mind that this is just an approximation, and actual birth weight may vary due to various factors. For a more accurate assessment of your baby’s growth and health during pregnancy, consult with your healthcare provider.

Leave a Comment