Embed our calculators on your site
All 50 tools are free to embed on any website, including commercial ones. One line of HTML, no account, no fee, no usage limit.
Every snippet ships with a plain credit link under the tool. Keeping it visible and crawlable is the whole licence — there is nothing else to agree to. The calculators run entirely in the visitor's browser, so an embedded tool sends no data anywhere, and the frame loads lazily so it never costs your page its largest-contentful-paint.
Every tool page carries its own snippet, plus the optional auto-resize script. The default frame height is 620px — change it freely.
Every embeddable tool
Questions
What does it cost?
Nothing, on any site including commercial ones. There is no account, no API key and no usage limit.
What is the condition?
Keep the credit link that comes with the snippet visible and crawlable. It is a plain link with the tool name as its text — no badge, no logo requirement, and please do not add rel="nofollow" to it.
Will it slow my page down?
The iframe is marked loading="lazy", so it is only fetched when it scrolls into view and never competes with your page's own largest content paint.
Does it track my visitors?
No. The calculators run entirely in the browser and the embed frame makes no outbound requests — its content security policy forbids them.
Can I change the size?
Yes, edit the width and height attributes. There is also an optional one-line resize script on each tool page that makes the frame grow to fit its content.