Pregnancy Conception Calculator
Calculate your conception date, due date, and track your pregnancy progress with our accurate calculator
Conception Date
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Due Date
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Current Progress
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Pregnancy Progress Timeline
1st Trimester
2nd Trimester
3rd Trimester
Week 0
Week 1
Week 40
Frequently Asked Questions
How accurate is the pregnancy conception calculator?
Our calculator uses the standard Naegele's rule for due date calculation, which is accurate for women with regular 28-day cycles. Accuracy may vary if your cycle is irregular or significantly longer/shorter than 28 days.
What is the difference between conception date and last menstrual period?
The last menstrual period (LMP) is the first day of your last period. Conception typically occurs about 11-21 days after your LMP, during ovulation. Pregnancy is calculated from the LMP, not the conception date.
Can I use this calculator if I have irregular periods?
Yes, but you'll need to adjust the cycle length in the calculator. If you're unsure of your cycle length, consult with your healthcare provider for a more accurate assessment.
How is the due date calculated?
The due date is calculated by adding 280 days (40 weeks) to the first day of your last menstrual period. This is based on the typical 28-day menstrual cycle with ovulation occurring on day 14.
Why does the calculator show I'm 4 weeks pregnant right after my missed period?
Pregnancy is calculated from the first day of your last period, not from conception. So by the time you miss your period, you're already considered about 4 weeks pregnant.