Estimate the modeled distribution and average number of live-born children between two ages, with age-window context.

Estimate the modeled distribution and average number of live-born children from a starting age, with reproductive-span context.

Estimate the chance of having a selected number of live-born children between two ages, plus the model-population average and age-window context.

Compare sperm quality by age with the 30-39 peak reference. Add semen-analysis values for a separate sample-based index.

Enter the CRL and NT from the same scan to see where the NT sits in a published reference distribution.

Enter crown-rump length to see estimated gestational age and published NT reference values for that measurement.

Enter CRL and, if available, the NT from the same scan to see reference values and an approximate reference percentile.

Turn an estimated due date into US timing windows and result dates for common prenatal screening and diagnostic tests.

Compare estimated miscarriage risk now with the risk at a future gestational week to help choose an announcement date.

Compare two quantitative hCG results to see whether the pattern better fits falling residual hCG or new hCG production.