Free Period Calculator Widget

Add a free, private period calculator to your website or blog in 30 seconds. No sign-up, no data collected — a genuinely useful tool for your readers.

1. Copy this one line of code

Paste it anywhere in your page — in the article body, sidebar, or footer.

<script src="https://periodcalculator.online/widget.js" defer></script>

2. That's it — your readers get a working tool

The widget automatically:

  • Predicts next period, ovulation, and fertile window
  • Resizes itself to fit your layout (mobile-friendly)
  • Runs 100% in the visitor's browser — no data is collected or stored

Live preview

Why add it?

  • Useful for readers: a free tool keeps visitors on your page longer
  • No setup: no account, no API key, no styling needed
  • Privacy-friendly: perfect for health-focused websites
  • Free forever: the widget is completely free to use