Basic Calculations - 100/month. Required link back.
Customize Calculations - unlimited. Customizable. No link.
Due Date Formula:
Due Date ~= Conception Date + 266 days
Due Date Definition
The Due Date Calculator is a pregnancy calculator that will calculate your approximate due date based on the date of your last period. Simply enter in the date of your last period and the Pregnancy Due Date Calculator will calculate the estimated date of conception!
How to Calculate Due Date
Let's be honest - sometimes the best due date calculator is the one that is easy to use and doesn't require us to even know what the due date formula is in the first place! But if you want to know the exact formula for calculating due date then please check out the "Formula" box above.
Add a Free Due Date Calculator Widget to Your Site!
You can get a free online due date calculator for your website and you don't even have to download the due date calculator - you can just copy and paste! The due date calculator exactly as you see it above is 100% free for you to use. If you want to customize the colors, size, and more to better fit your site, then pricing starts at just $29.99 for a one time purchase. Click the "Customize" button above to learn more!