Free calculator widgets for Notion or Confluence
Neither of these keeps raw HTML, so the widget goes in by URL rather than by code. That costs you the credit link, which then has to go beside it as ordinary text.
Any of the 342 calculators can go on a Notion or Confluence page. They are free, carry no ads, follow nobody, need no sign-up and do not expire — and the one on your page stays the current version of the calculator, so a snippet pasted once keeps giving the right answer.
Where it goes in Notion or Confluence
These strip raw HTML. Use their Embed block and give it the widget URL on its own — you lose the credit link, so add a normal link beside it.
The address
Notion or Confluence strips raw HTML, so there is no snippet to copy. Give the Embed block this address on its own:
https://www.calculateitnow.dev/embed/mortgage-calculatorSwap mortgage-calculator for any other calculator’s slug. Because the credit link lives outside the frame, going in this way leaves it behind — please add a plain link to the calculator beside the block instead.
What lands on the page
The real calculator, not a picture of one. Try it:
The rest of it
- Every widget — all 342 of them, by category, each with its own code.
- The one thing we ask — why the credit line sits outside the frame, and why keeping it is what pays for all this.
- Somewhere else — the same instruction for the other places people paste it.
- For developers — the JSON API, the MCP server and oEmbed, if you would rather not use a frame at all.