Pick a calculator, copy the code and paste it into your website or blog. It looks the same as here, runs in your visitor’s browser and updates itself when the rules change.
Last updated: 10/11/2026
Preview
How to embed one
Pick the calculator from the list.
Copy the code. It is an iframe plus a link to the full page.
Paste it into your site as HTML. In WordPress, use a “Custom HTML” block.
The height is 600 pixels. If the calculator is long, raise the height value in the code.
Terms
It is free, also on websites with ads.
Keep the link below the calculator. That is all we ask in return.
The embedded calculator shows no ads.
When a rule changes or we fix an error, your site gets it without you doing anything.
Privacy
The embed version loads no cookies, analytics or ads. Everything is calculated in your visitor’s browser: what they type never reaches your server or ours.
Need another size, another calculator or a Spanish version? Write to us.