Ultrasound Fetal Age Calculator
WIPEstimate gestational stage and approximate parturition timing from fetal measurements.
Patient & scan
🐣 Estimated fetal age
Enter a valid measurement to estimate timing.
Ultrasound Reference
ICC — Inner Chorionic Cavity
Obtain the maximal transverse gestational-sac plane, measure inner wall to inner wall in two perpendicular directions, average them, and enter the mean in mm.
BPD — Biparietal Diameter
Use a correctly aligned fetal head plane and measure the widest distance across the symmetrical parietal bones in mm.
Dog developmental landmarks
~Day 19–21 sacs · ~Day 23–26 cardiac activity · ~Day 35–39 bladder/stomach · ~Day 48–54 intestinal layering.
Evidence & References
Luvoni & Grioni (2000), J Small Anim Pract.
Beccaglia & Luvoni (2006), J Small Anim Pract.
Beccaglia et al. (2016), Reprod Domest Anim. doi:10.1111/rda.12782
Alonge et al. (2016), J Small Anim Pract. doi:10.1111/jsap.12534
Górka et al. (2025), Theriogenology. doi:10.1016/j.theriogenology.2024.10.030
Ultrasonographic fetometry provides an estimate of gestational stage and parturition timing. Accuracy varies with gestational stage, breed, litter characteristics, fetal positioning, measurement technique and operator experience. This tool supports veterinary judgement and does not replace clinical assessment.