Estimated Fetal Weight Calculator
Result
Calculated result
1.84639
Based on the values entered.
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Estimated Fetal Weight Calculator — free online calculator.
Formula
Hadlock (1985): log₁₀(EFW) = 1.3596 − 0.00386·AC·FL + 0.0064·HC + 0.00061·BPD·AC + 0.0424·AC + 0.174·FL
- Estimated Fetal Weight Calculator calculates its result from Fl, Ac, Hc, Bpd. It uses the formula Hadlock (1985): log₁₀(EFW) = 1.3596 − 0.00386·AC·FL + 0.0064·HC + 0.00061·BPD·AC + 0.0424·AC + 0.174·FL. Change any input to recalculate the result instantly. This is an informational calculation and is not medical advice.
- The main inputs are Fl, Ac, Hc, Bpd. Enter them in the units and format shown in the calculator.
- Use the measurement units shown beside each field. The result is an estimate and should be interpreted in context.
- Changing any input above recalculates the result with the same calculation engine used by this page.
Example: Estimated Fetal Weight
Inputs
- Fl: 2
- Ac: 3
- Hc: 4
- Bpd: 5
Using Fl = 2, Ac = 3, Hc = 4, Bpd = 5, the calculated result is 1.84639.
Sample result: Calculating…
Frequently asked questions
What does the Estimated Fetal Weight calculate?
Estimated Fetal Weight Calculator — free online calculator.
Which values should I enter?
Enter Fl, Ac, Hc, Bpd using the units and format shown beside each field.
What formula does this calculator use?
The calculator uses the following relationship: Hadlock (1985): log₁₀(EFW) = 1.3596 − 0.00386·AC·FL + 0.0064·HC + 0.00061·BPD·AC + 0.0424·AC + 0.174·FL.
Why might my result differ from another source?
Results can differ because measurement methods, rounding and assumptions vary. This calculator is an estimate and is not a medical diagnosis.
Does the result update automatically?
Yes. Changing an input updates the result using the same calculation engine shown on this page.