Pregnancy Calculator
Estimate gestational age and due date from the first day of the last menstrual period.
Calculator workspace
Enter your values and use the original calculator functions in the updated premium workspace.
How This Pregnancy Calculator Works
Estimate gestational age and due date from the first day of the last menstrual period. The rebuilt page uses calculator-specific logic rather than the legacy page script. Inputs are validated before calculation, and supporting figures are shown with the headline result so the arithmetic is easier to check.
Core method: Estimated due date = LMP + 280 days; gestational age = today − LMP.
How to Use It
- Enter the values requested in the calculator workspace.
- Select Calculate and correct any input highlighted by validation.
- Review the main answer, supporting figures and formula/method shown with the result.
- Use Copy Result, Share Result or Save Result Image if you need to keep the calculation.
Worked Example
The page estimates both current gestational age and the conventional 40-week due date.
Common Uses
- Pregnancy date estimates
- Week tracking
- Appointment preparation
Common Search Questions About Pregnancy Calculator
How do I calculate this?
Estimate gestational age and due date from the first day of the last menstrual period.
What formula does this calculator use?
Estimated due date = LMP + 280 days; gestational age = today − LMP.
How can I get the result quickly?
Enter the required values and select Calculate. The rebuilt mobile interface brings the result into view instead of leaving it far below the form.
Important Limitations
Pregnancy dating is approximate. Cycle length, conception timing and clinical findings can change the estimate. Use a healthcare professional for pregnancy care.
Frequently Asked Questions
Does the calculator upload my inputs?
No. The calculation runs in the browser and does not require an account.
Can I calculate again with different values?
Yes. Change any input and calculate again to compare scenarios.
Should I verify important results?
Yes. For high-impact financial, legal, health, engineering or contractual decisions, compare calculator output with current source information and appropriate professional guidance.