Home › Calculators
Perinatology and Obstetrical Calculators
Find tools by name or clinical topic. Expand a category to browse its calculators.
69 tools listed
Dating, growth & fetal size13 tools
- ACOG dating and redating criteriaACOG-based EDD selection
- CRL and nuchal translucencyFirst-trimester
- Fetal Biometry 5.0Current biometry and EFW
- Fetal HC TrackerSerial head circumference tracking and z-scores
- Fetal length from femurEstimated length
- FGR evaluation wizardSingleton and MCDA pathways
- Hadlock fetal age / estimated fetal weightMultiple biometry equations
- hCG doubling timeSerial hCG
- Maternal age at expected deliveryAge at EDD
- Pregnancy due date and gestational ageLMP, ultrasound, IVF and dates
- Pregnancy weight gainWeight-gain planning
- Probability of preterm delivery after in-utero transferTransfer risk
- Twin birth-weight discordanceTwin growth
Fetal ultrasound, Doppler & anomaly12 tools
- Age-adjusted ultrasound Down syndrome riskUltrasound marker modifiers
- Cervical length and preterm birth riskCervical measurement
- CPAM lesion, CVR, QLI and mass effectCongenital pulmonary airway malformation
- Fetal echocardiogram z-scores 2Current version
- Fetal echocardiogram z-scores — previous versionEarlier reference
- Fetal nasal bone lengthNBL
- Fetal ultrasound abnormality toolAnomaly assessment
- LHR and quantitative lung indexCongenital diaphragmatic hernia
- MCA peak systolic velocity — monochorionic twinsTwins / TAPS
- MCA peak systolic velocity — singletonFetal anemia surveillance
- Skeletal surveyLong bones and proportions
- Umbilical artery Doppler reference rangesUA S/D, RI, PI
Diabetes, insulin & nutrition9 tools
- Blood glucose unit conversionmg/dL and mmol/L
- Carbohydrate exchange counterDaily diet planning
- GDM caloric needs and initial insulinPregnancy diabetes
- Hemoglobin A1c and estimated average glucoseHbA1c to eAG
- Initial insulin pump requirementsAACE and Sweet Success
- Insulin adjustment with betamethasoneSteroid course
- Insulin correction doseCorrection dosing
- Insulin supply and refill plannerPens and vials
- Multiple daily injections (MDI)Insulin regimen
Obstetric risk, labor & maternal care17 tools
- Adnexal mass in pregnancy riskOvarian mass
- Bishop scoreCervical readiness
- Cardiac disease in pregnancyMaternal cardiac risk
- Edinburgh postnatal depression scaleEPDS screening
- External cephalic version successECV prediction
- Five-tier fetal heart rate calculatorIntrapartum fetal assessment
- fullPIERS preeclampsia riskPreeclampsia model
- Intravascular fetal transfusionIUT / IVT
- Iron deficit and iron doseIron treatment planning
- New Ballard scoreNewborn maturity
- Pregnancy-adapted YEARSVTE / suspected PE
- Quantified blood loss (QBL)Postpartum hemorrhage
- Sepsis in obstetrics scoreS.O.S.
- sFlt-1/PlGF biomarker interpretationPreeclampsia biomarkers
- Trial of labor after cesarean (TOLAC)UCSD model
- Umbilical cord blood gasCord gas
- Urine protein/creatinine ratioUPCR
Genetics & chromosome risk8 tools
- cfDNA / NIPT and ultrasound risk teaching wizardTeaching / risk interpretation
- Chromosome abnormality risk at termMaternal age
- Hardy–Weinberg carrier frequencyCarrier probability
- Known maternal carrier: offspring riskCounseling risk
- Maternal age and gestational-age chromosome riskChromosome risk by GA
- Midtrimester aneuploidy risk by maternal ageMidtrimester
- Pedigree generator and inheritance screenGenetics utility
- Theoretical trisomy risk in multiple gestationMultiple gestation
General clinical & unit conversion10 tools
- Alveolar–arterial oxygen gradientA–a gradient
- Anion and delta gapElectrolytes
- Berlin sleep-apnea questionnaireOSA
- Body mass index, BSA and ideal body weightAdult BMI / BSA
- Consolidated laboratory and unit converterLength, weight, pressure, temperature, volume and labs
- Corrected calciumAlbumin-adjusted
- Corrected sodium and effective osmolalityHyperglycemia
- Creatinine clearance in pregnancyRenal
- Mean arterial pressureMAP
- PTU ↔ methimazole conversionThyroid
No matching tools. Try a broader term.
Clinical use: Confirm inputs, reference ranges, and results before use. These calculators support, but do not replace, clinical judgment and current guidelines. Links refer to calculators and decision-support tools published on Perinatology.com. Some specialized tools remain marked BETA on their individual pages.