Pregnancy Calculator – Your Quick Guide to Due Dates, Gestational Weeks, and Trimester Tracking
What It Does
Our free, web‑based pregnancy calculator instantly estimates three key pieces of information from the date of your last menstrual period (LMP):
- Estimated Due Date (EDD) – the projected birth date based on a standard 40‑week pregnancy.
- Gestational Age in Weeks – how many full weeks have elapsed since your LMP.
- Current Trimester – whether you’re in the 1st, 2nd, or 3rd trimester.
These metrics are essential for planning prenatal appointments, tracking fetal development, and sharing milestones with loved ones.
How to Use the Calculator
- Enter Your LMP
- Click the calendar icon next to “last menstrual period”.
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Select the first day of your last period (the date you started bleeding).
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Click “Calculate”
- The button below the date field triggers the calculation.
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The result appears in the read‑only text box labeled “Due: …, Week …, … Trimester”.
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Copy or Share
- Click the result field to copy the text to your clipboard automatically.
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Press the “𝕏” button to open a pre‑filled tweet (or X post) with your due date and trimester, perfect for sharing with your support network or healthcare provider.
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Interpret the Output
- Due: The projected birth date (YYYY‑MM‑DD).
- Week: How many full weeks pregnant you are.
- Trimester: 1st (≤12 weeks), 2nd (13‑27 weeks), or 3rd (≥28 weeks).
Definitions & Key Concepts
| Term | What It Means |
|---|---|
| Last Menstrual Period (LMP) | The first day of your last menstrual cycle; the starting point for gestational age calculations. |
| Estimated Due Date (EDD) | The date when a full 40‑week pregnancy would typically conclude. |
| Gestational Age | The number of weeks since your LMP; used to track fetal development. |
| Trimester | The pregnancy divided into three roughly equal 13‑week phases: 1st, 2nd, 3rd. |
| 40‑Week Pregnancy | Standard length of a full-term pregnancy, from LMP to delivery. |
Use Cases & Why It Matters
- Family Planning – Quickly determine how far along you are and plan for medical appointments.
- Prenatal Care – Share your gestational age with your obstetrician to schedule ultrasounds, screenings, and check‑ups.
- Milestone Tracking – Celebrate each week or trimester with friends and family, or keep a personal pregnancy journal.
- Educational Tool – Teachers, counselors, or expectant parents can use it to illustrate pregnancy timelines in a classroom or support group.
Summary
- Overall page: Pregnancy calculator, due date, gestational age, trimester calculator, family planning.
- Description: “Use our free pregnancy calculator to find your due date, weeks pregnant, and trimester. Enter your last menstrual period and get instant results. Share on X or copy to clipboard.”
- Structured Data: The page includes schema.org markup for a SoftwareApplication, ensuring search engines recognize it as a utility tool.
Final Tips
- Accuracy: The calculator assumes a 280‑day (40‑week) pregnancy. For irregular cycles or medical conditions, consult your healthcare provider.
- Date Format: The output is in ISO format (YYYY‑MM‑DD). Adjust to your local date style if needed.
- Accessibility: The result field is read‑only and can be copied by clicking, making it easy for screen readers and keyboard users.
Enjoy a quick, reliable way to stay informed about your pregnancy journey!