Embed the calculator.
Drop the universal calculator into your own page. Free, no tracking, attribution link included.
Embed snippet
<iframe src="https://tankvolumecalc.com/?embed=1" style="width:100%;max-width:760px;height:640px;border:1.5px solid #1b2733"
loading="lazy" title="Tank Volume Calculator"></iframe>
The embed view hides site navigation and ads. Terms: keep the attribution link visible; don't wrap it in your own paywall.