Peso Fetal Estimado (Hadlock 1)
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
Hadlock
About this calculator
The Hadlock 1 Fetal Weight Estimator is a useful online tool for doctors and obstetricians who need to estimate the fetal weight during pregnancy. Based on the Hadlock formula, this calculator considers two essential parameters: gestational age (AC) and fetal head circumference (CF).
To use this calculator, you need to enter gestational age and fetal head circumference. Then, the Hadlock formula is applied to calculate the estimated fetal weight. Please note that this is an estimate and not an exact value, as fetal weight can vary according to several factors.
This calculator is particularly useful in prenatal care, when doctors need to monitor fetal growth and identify potential health problems. It can also be used in cases of premature birth or in emergency obstetric situations.
However, please remember that this is just a tool and cannot replace the evaluation of a qualified doctor or obstetrician. It is always recommended to consult a healthcare professional before making any decision.
Frequently asked questions
How do I use this calculator?
Just enter gestational age and fetal head circumference in the calculator and click 'Calculate'. The estimated fetal weight will be displayed next.
What is the Hadlock formula?
The Hadlock formula is a mathematical equation that estimates fetal weight based on gestational age and fetal head circumference.
Is this calculator reliable?
This calculator is a useful tool, but please remember that it is just an estimate and not an exact value. It is always recommended to consult a healthcare professional before making any decision.
When is this calculator especially useful?
This calculator is especially useful in cases of prenatal care, premature birth or in emergency obstetric situations.
Can I use this calculator if I am not a doctor?
Yes, you can use this calculator, but please remember that the results should be discussed with a qualified healthcare professional.