Free due date calculator widget for your website
Add a clean, private pregnancy due date calculator to your own site in seconds. Free, no sign-up, no tracking — just copy the code below and paste it in.
Copy the embed code
Paste this into any HTML block on your site (WordPress, Wix, Squarespace, Ghost, or plain HTML):
How to add it
Why use this widget?
It’s a genuinely useful tool for any pregnancy, parenting, midwifery or health site: visitors get an instant estimated due date, gestational age and trimester from their last period, without leaving your page. Everything runs in their browser, so it’s fast and private — there are no third-party trackers to slow your site or complicate your privacy policy. For the full multi-method calculator (ultrasound, IVF, conception and more), visitors can follow the link to the OB wheel.
Terms of use
The widget is free to embed on any site. Please keep the “Powered by OB Wheel” link intact — it’s the only thing we ask in return. The tool provides general estimates for information only and isn’t medical advice; see our terms and privacy policy.
Frequently asked questions
Is the widget free to use?
Yes, completely free. Copy the embed code and paste it into any website, blog or CMS. There are no fees, no sign-up and no tracking scripts.
Can I use it on WordPress, Wix or Squarespace?
Yes. Paste the iframe code into a Custom HTML / embed block. It works on any platform that allows an HTML embed, including WordPress, Wix, Squarespace, Ghost and plain HTML sites.
Does the widget collect any data?
No. The calculator runs entirely in the visitor’s browser — nothing they enter is stored or sent anywhere. It sets no cookies.
Can I change the size?
Yes. Adjust the width and height attributes in the iframe code. It’s responsive and works well from about 320px wide upward.