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Assess Your Nuchal Translucency Calculator

July 21, 2026July 21, 2026 by Sam Gorman

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

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Estimate Your Nuchal Translucency Calculator

July 21, 2026July 21, 2026 by Sam Gorman

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

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Nuchal Translucency Reference Calculator

July 21, 2026July 21, 2026 by Sam Gorman

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

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Prenatal Testing Timeline and Results-Date Calculator

July 21, 2026July 14, 2026 by Sam Gorman

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

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Pregnancy Announcement Risk-by-Date Calculator

July 21, 2026July 14, 2026 by Sam Gorman

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

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Residual hCG or New Pregnancy Calculator

July 21, 2026July 14, 2026 by Sam Gorman

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

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Birth Control Switch Protection-Gap Calculator

July 21, 2026July 14, 2026 by Sam Gorman

Find how many days of backup protection may be needed when starting or switching birth control under current US CDC rules.

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Can Ultrasound Tell Who the Father Is? Calculator

July 21, 2026July 14, 2026 by Sam Gorman

Compare two intercourse dates with an ultrasound-based conception window to see whether timing favors one possible father.

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Early Ultrasound Visibility and Best Scan Date Calculator

July 22, 2026July 14, 2026 by Sam Gorman

Estimate gestational-sac or yolk-sac visibility on transvaginal ultrasound and a possible scan date from an hCG trend.

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Vanishing Twin NIPT Timing Calculator

July 21, 2026July 14, 2026 by Sam Gorman

Estimate vanishing-twin interference concern for an NIPT blood draw using timing, gestational age, and ultrasound type.

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Advertiser disclosure: PregnancyChanceCalculator.com is an independent, advertising-supported calculator site. Display ads are served by partners such as Mediavine. We may earn revenue from ads or referral links where noted. Advertising does not influence our calculators or editorial content.

About these calculators: Our tools provide estimates based on published research and population-level data. Results are illustrative and may not reflect your individual circumstances. They are not medical advice. Read our Health Disclaimer and the "Methodology and sources" section on each tool for assumptions and limitations.

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