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11 calculators
Obstetric tools are date-bound: most are only valid within a defined gestational window, and several are repeated at every antenatal visit so change can be tracked. Clinicians use them to date a pregnancy, estimate fetal size, judge readiness for labour, screen for pre-eclampsia, and check mood through the perinatal period. Estimated blood loss and magnesium dosing support the emergency response when complications occur.
This page groups by clinical area, so the tools below are the ones this setting reaches for — the subject-focused view of the same calculators lives on the categories pages, the full alphabetical list collects everything in one place, and the comparison tool lines up three tools side by side when two of them look interchangeable.
Estimates the expected date of delivery from the last menstrual period.
Obstetrics & GynecologyEstimates gestational age from weeks and days.
Obstetrics & GynecologyScores cervical readiness for induction of labor (Bishop 1964). Five components (dilatation, effacement, station, consistency, position) are each scored 0–3 (or 0–2) and summed to a total of 0–13; higher scores predict a higher likelihood of successful induction and vaginal delivery.
Obstetrics & GynecologyScores fetal well-being (Manning 1980) from five components — fetal breathing, gross body movement, fetal tone, amniotic fluid volume, and (in the full BPP) a non-stress test — each scored 0 or 2 for a total of 0–10. Higher scores indicate reassuring fetal status; lower scores identify fetuses at risk who warrant delivery planning.
Obstetrics & GynecologyAssesses the HELLP syndrome (Hemolysis, Elevated Liver enzymes, Low Platelets) using the Tennessee (Sibai) diagnostic criteria: hemolysis (LDH ≥ 600 U/L or schistocytes/low haptoglobin), AST ≥ 70 U/L, and platelets < 100,000/µL. HELLP is a severe form of preeclampsia with substantial maternal and fetal risk.
Obstetrics & GynecologyEstimates fetal weight from four standard ultrasound biometric measurements (BPD, head circumference, abdominal circumference, and femur length) using the Hadlock four-parameter formula (1985). Output is the estimated fetal weight in grams, with the characteristic ±1 SD error of approximately 7.5%.
Obstetrics & GynecologyAssesses the diagnostic criteria for preeclampsia and the presence of severe features using ACOG Practice Bulletin No. 222 (2020): hypertension after 20 weeks with proteinuria or end-organ dysfunction, with severe features including BP ≥ 160/110, thrombocytopenia, renal insufficiency, liver involvement, pulmonary edema, and cerebral/visual symptoms.
Obstetrics & GynecologyProvides the Institute of Medicine (IOM/NRC 2009) recommended total gestational weight gain and second/third-trimester rate based on pre-pregnancy body mass index (BMI). Categories: underweight (< 18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥ 30).
Obstetrics & GynecologyEstimates the total 24-hour magnesium sulfate dose for a selected IV regimen (loading dose + maintenance infusion) used for prevention and treatment of eclampsia in appropriate preeclampsia/eclampsia settings, consistent with ACOG Practice Bulletin No. 222 (2020) and WHO recommendations. Magnesium sulfate is a high-risk medication: regimen choice depends on clinical setting, route, renal function, monitoring capability, and clinician judgment.
Obstetrics & GynecologyEstimates intraoperative blood loss in obstetrics by two methods: gravimetric (weighed sponges/drapes, 1 g ≈ 1 mL blood) and hematocrit-based (EBL = estimated blood volume × (pre-Hct − post-Hct)/pre-Hct, using a pregnancy blood volume of approximately 85 mL/kg). Postpartum hemorrhage is defined as cumulative blood loss ≥ 1000 mL within 24 hours.
Obstetrics & GynecologyScreens for postpartum (and antenatal) depression using the 10-item Edinburgh Postnatal Depression Scale (Cox 1987). Each item is scored 0–3 for a total of 0–30. A total ≥ 10 (or ≥ 13 in some settings) is screen-positive, and any positive response on item 10 (self-harm) requires immediate evaluation.
Obstetrics & Gynecology