Pregnancy & Fertility Calculators

8 live calculators · free, instant & private

Pregnancy calculatorHow far along you are — weeks, trimester and key dates from your LMP or due date.Open calculator →Due Date calculatorEstimated due date from last period, conception day or IVF transfer.Open calculator →Pregnancy Weight Gain calculatorHealthy gain range for your week, from official IOM guidelines.Open calculator →Ovulation calculatorFertile window, ovulation day and your next three cycles.Open calculator →Conception calculatorWhen conception likely happened, from a due date or birth date.Open calculator →Period calculatorForecast your next six periods, ovulation days and fertile windows.Open calculator →Pregnancy Test calculatorForecast your next six periods, ovulation days and fertile windows.Open calculator →hCG calculatorForecast your next six periods, ovulation days and fertile windows.Open calculator →

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Guides for pregnancy & fertility

Worked examples and the reasoning behind these calculators. Browse all guides →

HealthWhen to Take a Pregnancy Test (and What hCG Levels Mean)Aug 31, 2026 · 6 min read HealthWhen Did I Conceive? Working Back From a Due DateAug 14, 2026 · 4 min read HealthHow to Predict Your Next PeriodAug 10, 2026 · 4 min read HealthHow Much Weight Should You Gain During Pregnancy?Aug 5, 2026 · 5 min read HealthWhen Are You Most Fertile? The Fertile Window ExplainedJul 25, 2026 · 5 min read HealthHow Is a Due Date Calculated? Naegele's Rule ExplainedJul 15, 2026 · 5 min read

About these calculators

These tools cover the timeline from trying to conceive through to a due date: ovulation and fertile window from your cycle length, conception date estimates, an LMP-based due date with the gestational week you are in now, hCG doubling times, and week-by-week weight gain guidance based on starting BMI.

Every result is an estimate built on cycle averages — real cycles vary, and an ultrasound date from your provider always takes precedence over a calculated one. Nothing you enter is transmitted or stored anywhere: these run entirely inside your browser, which for this category matters more than most.

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Every category, same promise: runs in your browser, shows its math, never sees your numbers.

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