Clinical use
Use this calculator for calculate gestational age and edd from lmp in theobstetrics workflow. It is decision support and should be interpreted with the patient context, local protocols, and clinician judgment.
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Obstetrics
Gestational Age Calculator Calculator
Calculate gestational age and EDD from LMP
Calculate GA
Interpretation
Based on Naegele's rule (LMP + 280 days). First trimester US dating is gold standard if >7 day discrepancy with LMP. Critical for timing of interventions.
Required inputs
- Lmp Date
Optional: Calculation Date
Evidence and limitations
This page cites 1 published reference. Confirm units and inclusion criteria before applying the output; calculators do not replace assessment, escalation, or local policy.
References
- ACOG Practice Bulletin No. 700
Frequently asked questions
What is the Gestational Age Calculator?
Gestational Age Calculator is a clinical calculator used for Calculate gestational age and EDD from LMP.
How do I interpret the Gestational Age Calculator?
Based on Naegele's rule (LMP + 280 days). First trimester US dating is gold standard if >7 day discrepancy with LMP. Critical for timing of interventions.
What inputs are required for the Gestational Age Calculator?
Required inputs include Lmp Date. Optional inputs include Calculation Date.
What is the evidence behind the Gestational Age Calculator?
The Gestational Age Calculator page cites ACOG Practice Bulletin No. 700.
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