Free due date calculator with two modes: pregnancy due date (Naegele's rule from last menstrual period) and project deadline calculator. View trimester timeline, week-by-week development, key milestones, and days remaining.
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Using Naegele's rule: add 280 days (40 weeks) to the first day of your last menstrual period (LMP). Only about 5% of babies are born on their exact due date — most arrive within 2 weeks before or after.
If you know your conception date, add 266 days (38 weeks). Your doctor can also estimate due date from an early ultrasound, which is most accurate in the first trimester.
First trimester: weeks 1-12 (major organ development). Second trimester: weeks 13-26 (rapid growth, movement felt). Third trimester: weeks 27-40 (weight gain, preparation for birth).
Using the Due Date Calculator is simple: visit the tool page, enter your data or input into the provided fields, and get instant results. No downloads, installations, or sign-ups are required. The tool runs directly in your web browser for maximum convenience.
Yes, the Due Date Calculator is 100% free to use with no limitations. There is no registration required, no daily usage caps, and no hidden fees. You can use it as many times as you need.
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Free due date calculator with two modes: pregnancy due date (Naegele's rule from last menstrual period) and project deadline calculator. View trimester timeline, week-by-week development, key milestones, and days remaining.
NexTool's Due Date Calculator is completely free to use with no sign-up required. Your data is processed directly in your browser and never sent to our servers, ensuring complete privacy and instant results.
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This calculator provides an estimate only based on Naegele's Rule (LMP + 280 days). Only about 5% of babies are born on their exact due date.
This tool is for informational purposes only and does not constitute medical advice. Always consult your healthcare provider for accurate pregnancy dating.
Naegele's Rule: The due date is calculated by adding 280 days (40 weeks) to the first day of your last menstrual period (LMP).
Conception Date Method: If you know the conception date, the calculator subtracts 14 days to estimate the equivalent LMP, then applies Naegele's Rule.
Trimesters: First trimester spans weeks 1-13, second trimester weeks 14-27, and third trimester weeks 28-40.