Four everyday obstetric and labor-&-delivery tools in one place. Toggle between EDD & gestational age (from LMP or ultrasound, with ACOG redating), GTPAL (gravida, term, preterm, abortions, living), the APGAR newborn score (1 & 5 minutes), and the Bishop score (cervical favorability for induction). Calendar, count, and point math only — each keeps its own scoring rules and citations; the dating and the plan are your provider’s.
Enter the scan date and the gestational age the ultrasound measured.
Enter an LMP and/or an ultrasound to see the due date and gestational age.
ACOG redating thresholds — when ultrasound replaces LMP [2]
GA by ultrasound
Method
Redate if LMP–US differ by more than
≤8w6d
CRL
5 days
9w0d–13w6d
CRL
7 days
14w0d–15w6d
BPD/HC/AC/FL
7 days
16w0d–21w6d
BPD/HC/AC/FL
10 days
22w0d–27w6d
BPD/HC/AC/FL
14 days
≥28w0d
BPD/HC/AC/FL
21 days
When the discrepancy exceeds the threshold for the gestational age at the time of the scan, the estimated due date is generally changed to the ultrasound date; otherwise the LMP date is kept. The earliest accurate ultrasound is the most reliable dating tool. The official dating decision is made by your provider.
Disclaimer: Educational calculator only. This performs calendar arithmetic (Naegele’s rule and ACOG/AIUM/SMFM redating thresholds) and does not interpret ultrasound images, account for assisted reproduction (where transfer/retrieval dates set the EDD), multiple gestation, or clinical context. Enter de-identified values only; nothing is stored or transmitted. The estimated due date and gestational age of record are set by your provider.
References
Naegele’s rule for the estimated date of delivery: EDD = first day of LMP + 280 days (40 weeks), assuming a 28-day cycle. Standard obstetric dating method.
American College of Obstetricians and Gynecologists, American Institute of Ultrasound in Medicine, Society for Maternal-Fetal Medicine. Committee Opinion No. 700: Methods for Estimating the Due Date. Obstet Gynecol. 2017;129(5):e150–e154. acog.org. (Redating thresholds by gestational-age window.)
Thresholds transcribed from ACOG Committee Opinion 700. Your provider sets the dating of record.
Enter the pregnancy history
Count pregnancy events, not fetuses, for G/T/P/A. A multiple gestation (twins, triplets) is one pregnancy and one birth event; count each baby only under Living.
Children currently alive (count each baby — twins = 2)
Para (the “para” number) = T + P = number of births at ≥20 weeks. A pregnancy still in progress counts toward Gravida but not yet toward T or P. The 20-week and 37-week cutoffs are the common US definitions; some institutions vary.
Disclaimer: Educational tool only. GTPAL is a documentation shorthand, not a clinical assessment; cutoffs (especially the lower limit of viability/abortion at ~20 weeks and the term cutoff at 37 weeks) follow common US conventions and can differ by institution. Multiple gestations and pregnancy losses are frequent sources of miscoding — confirm against your facility’s charting standard. Enter de-identified values only; nothing is stored or transmitted.
References
GTPAL / gravidity and parity terminology. Standard obstetric nomenclature; see e.g. Gravidity and Parity Definitions. StatPearls. Treasure Island (FL): StatPearls Publishing. ncbi.nlm.nih.gov/books/NBK544294. (Definitions of gravida, para, and the TPAL components; term ≥37w, preterm 20–36w6d, abortion <20w; multiples count as one parity event.)
Definitions transcribed from standard obstetric references; institutional charting conventions take precedence.
1-minute score — a snapshot of the transition right after birth.
Total 0–10. Scored at 1 and 5 minutes, then every 5 minutes up to 20 minutes for any infant scoring <7 at 5 minutes. A 5-minute score of 7–10 is reassuring, 4–6 moderately abnormal, and 0–3 low.[2] Document concurrent resuscitation on an expanded Apgar form, since interventions (oxygen, PPV, CPAP) affect the score.[2]Mnemonic: A-P-G-A-R.
Disclaimer: Educational tool only — not a clinical decision-support device, not a diagnosis, and not a substitute for newborn resuscitation training (NRP), the provider's care, or your facility's policy. Per AAP/ACOG, the Apgar score does not determine whether or how to resuscitate — resuscitation follows the baby's heart rate, breathing, and tone and begins before the 1-minute score — and a low score does not by itself diagnose asphyxia or predict an individual baby's neurologic outcome. The score is affected by gestational age, maternal medications, and resuscitation. Enter de-identified values only; nothing is stored or transmitted.
References
Apgar V. A proposal for a new method of evaluation of the newborn infant. Curr Res Anesth Analg. 1953;32(4):260–267. PMID: 13083014. (Original five-sign newborn scoring method.)
American Academy of Pediatrics Committee on Fetus and Newborn; American College of Obstetricians and Gynecologists Committee on Obstetric Practice. The Apgar Score. Pediatrics / ACOG Committee Opinion. acog.org. (Components & 0–2 scoring; reported at 1 and 5 min, then q5 min to 20 min if <7; 5-min interpretation 7–10 reassuring / 4–6 moderately abnormal / 0–3 low; expanded reporting form; not for predicting individual outcome or directing resuscitation.)
APGAR Score. StatPearls. Treasure Island (FL): StatPearls Publishing. ncbi.nlm.nih.gov/books/NBK470569. (Component bands and timing summary.)
Components, bands, timing, and the AAP/ACOG caveats were transcribed from these sources. Your facility's newborn and resuscitation policies take precedence at the bedside.
Score the five cervical-exam parameters
Findings come from the digital cervical exam. The total updates as you go.
0/ 13 · 0 of 5 parameters scored
Score all five parameters to see the total and favorability.
Total 0–13. A score of ≤6 is generally considered unfavorable ("unripe") — cervical ripening is often considered before or with induction; a score >8 describes a favorable cervix, where the likelihood of vaginal delivery after induction is similar to spontaneous labor.[1][2] (Some references use ≥8 as the favorable threshold; 7–8 is intermediate.) If a finding falls between the listed bands, round to the nearest one — the gaps reflect Bishop's original increments. Your provider and unit protocol drive the induction plan.
Disclaimer: Educational tool only — not a clinical decision-support device, not a diagnosis, and not a substitute for the cervical exam itself, the provider's plan, or your unit's induction protocol. The Bishop score predicts induction favorability; it is one input among many (parity, gestational age, indication, fetal status). Modified versions substitute cervical length for effacement or add parity, and thresholds vary slightly by source. Enter de-identified values only; nothing is stored or transmitted. Confirm the approach your team and provider use.
References
Bishop EH. Pelvic scoring for elective induction. Obstet Gynecol. 1964;24:266–268. PMID: 14199536. (Original five-parameter pelvic/cervical scoring system; dilation, effacement, station scored 0–3 and consistency, position scored 0–2.)
Bishop Score. StatPearls. Treasure Island (FL): StatPearls Publishing; updated 2023. ncbi.nlm.nih.gov/books/NBK470368. (Scoring table; total 0–13; ≤6 unfavorable / >8 favorable interpretation and clinical use for cervical ripening.)
American College of Obstetricians and Gynecologists (ACOG). Induction of labor (Practice Bulletin). Washington, DC: ACOG. acog.org. (An unfavorable Bishop score is a common indication for cervical ripening before induction.)
Parameter bands and interpretation were transcribed from these sources. Modified Bishop variants and local protocols differ; your provider's approach takes precedence.
