Our Calculators & Tools

All Calculators

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Pregnancy Due Date Calculator

Estimate your baby’s arrival from LMP or ultrasound.

Popular
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Ovulation Calculator

Find your most fertile days and ovulation date.

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Implantation Calculator

Estimate your implantation window and best day to test.

Trending
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Twin & Triplet Due Date

EDD plus typical delivery windows for multiples.

New
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IVF/FET Due Date

EDD from transfer date (Day 3/5/6) + GA today.

New
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Ultrasound Due Date

EDD from scan date and gestational age at ultrasound.

New
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Pregnancy Chance Calendar

See your daily conception odds across the cycle.

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Advanced Pregnancy Chance

Refine your estimate with age, BMI, and factors.

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One-Time Pregnancy Chance

Estimate odds from a single encounter.

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Fertility by Age

How age affects natural fertility rates.

❤️

Miscarriage Risk

Data-driven estimate of miscarriage risk.

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Pregnancy Test Accuracy

Estimate accuracy by DPO and brand.

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hCG Levels & Doubling Time

Compute doubling time, trend, and 48-hour projection.

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Conception Date

Find conception from LMP, EDD, or ultrasound.

Reverse Due Date

Work backward from EDD to estimate conception.

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Due Date by Intercourse Date

Timeline from a specific intercourse/conception date.

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Missed Pill Risk

Estimate pregnancy risk after a late or missed pill.

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Contraceptive Risk

Understand pregnancy risk by contraceptive method.

Combine Methods

Calculate effectiveness when using two methods.

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Morning-After Pill Effectiveness

Model effectiveness by hours since sex and BMI.

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Frequently asked questions

Are these calculators free to use?
Yes. Everything here is free.
Which calculator should I try first?
For timing, use the Ovulation Calculator or Implantation Calculator. If you already had a scan or transfer, try the Ultrasound Due Date or IVF/FET Due Date.
How accurate are the results?
They’re estimates based on peer-reviewed data and common clinical rules. Your clinician’s guidance always takes precedence.
Where does the data come from?
See our How it works and Data sources pages for references.