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Pregnancy Conception Calculator

Estimate conception dates from cycle, due-date, or ultrasound information.

Conception Date · Due Date Reverse · 6-Month Fertility Planner

Calculate Your Conception Date

Calculate From

Cycle Length

days

First Day of Last Period

Estimated Conception Date

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Conception Summary

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Conception Date (est.)

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Conception Window

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Ovulation Day

—

Due Date (EDD)

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LMP Date

—

Cycle Day of Conception

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Weeks Since Conception

—

Gestational Age (today)

—

Conception to Birth Timeline

Your Conception Cycle — Day by Day

Period

Fertile

Peak fertile

Ovulation

Conception window

Conception Insights

Earliest possible conception date:—

Latest possible conception date:—

Zodiac sign (based on EDD):—

Baby's birth year:—

Chinese zodiac year:—

Conception Insights

Work Backwards From Your Due Date

Your Due Date (EDD)

Cycle Length

days

Estimated Conception Date

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Due Date (EDD)

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Conception Date

—

LMP Date

—

Ovulation Day

—

Fertile Window

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Conception Window

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Trimester 1 Ends

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Trimester 2 Ends

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Complete Pregnancy Timeline (from Due Date)

Date Scenarios

If cycle is 21 days (earliest conception):—

If cycle is 35 days (latest conception):—

IVF Day-5 transfer date (if applicable):—

Early due date (38 weeks):—

Late due date (42 weeks):—

Plan Your Best Conception Windows

First Day of Last Period

Cycle Length

days

Plan Ahead

Next Ovulation Date

—

Your Upcoming Fertile Windows

Full Fertility Plan — All Cycles

Cycle	Period Start	Fertile Window	Ovulation	Peak Days	If Conceived → Due Date

Conception Planning

Days until next ovulation:—

If conceiving this cycle → due date:—

If conceiving next cycle → due date:—

Number of fertile windows in plan:—

Best intercourse frequency during fertile window:Every 1–2 days for highest success rate

Fertility Planning Insights

Use caseWho should use it?

Use this calculator as a planning estimate, then compare results with real food logs and progress over time.

Next stepTrack results in CALRI

Use the app to log food, compare calories, and review macro consistency over time.

Download the app

Meal planningTurn targets into meals

Move from numbers to breakfast, lunch, dinner, and snack ideas.

Open meal planner

FAQs

Frequently Asked Questions

Quick answers about using CALRI tools for calorie tracking, recipes, and meal planning.

Is the Pregnancy Conception Calculator medical advice?

No. CALRI calculators provide educational estimates only. Speak with a qualified healthcare professional for medical or diet decisions.

How should I use the result?

Use the result as a starting point, then track food, weight, energy, and progress over time before making changes.

Can I connect this with recipes?

Yes. Use CALRI recipes and the meal planner to build meals that match your calorie and macro targets.

Pregnancy Conception Calculator

Continue with another CALRI calculator

Ovulation Calculator

Pregnancy Calculator

Pregnancy Weight Gain Calculator

Frequently Asked Questions

Is the Pregnancy Conception Calculator medical advice?

How should I use the result?

Can I connect this with recipes?