Calculator
Result
Answer will appear hereEnter the values above and press Calculate to see the answer, step-by-step solution, and formula used.
How the result is calculated
Due date estimate = Last period date + 280 days
Pregnancy Due Date Calculator
Use this calculator to calculate pregnancy due date using a clear formula and simple inputs.
Explanation
What this calculator does
Pregnancy Due Date Calculator helps you calculate the result using clear inputs, a formula, and practical examples.
This calculator is for general information only and is not medical advice or a diagnosis.
How LearnLinx Calculates This Result
Formula
Due date estimate = Last period date + 280 days
Enter your values and press Calculate to see each computation step with your numbers plugged into this formula.
Example
Enter your values, calculate the result, and review the formula used for the answer.
When to use it
Use it when you need a quick result for study, planning, documentation, or checking a manual calculation.
Common mistakes
- Using an uncertain last menstrual period date as if it were exact.
- Forgetting that ultrasound dating can revise the estimate.
- Treating the due date as a guaranteed delivery day.
Frequently asked questions
What rule is used?
Naegele-style estimate: last period start + 280 days (40 weeks).
Is ultrasound more accurate?
Often yes early in pregnancy—follow your clinician.
What formula does the Pregnancy Due Date Calculator use?
It uses: Due date estimate = Last period date + 280 days. The result page also shows a step-by-step breakdown of how your answer was calculated.
Is the Pregnancy Due Date Calculator free to use?
Yes. All LearnLinx calculators are completely free with no signup required. Signing in is optional and only adds a 60-day history of your calculations.
Is this medical advice?
No. This calculator provides general information only and is not medical advice or a diagnosis. Consult a qualified health professional for personal guidance.