Calculate your menstrual cycle length from period start dates. See each cycle’s length, your average, and the shortest-to-longest range.

Explore parental-age estimates for Down syndrome, Edwards syndrome, autism and miscarriage, with context for other pregnancy and child health outcomes.

Assess what abortion history, recovery, age, and known fertility factors can and cannot tell you about future fertility, with a separate cohort benchmark.

Estimate population-based complication benchmarks for one or more future abortion types, including serious complications, mortality, treatment, infection, and fertility context.

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.