Embed reefcalcs on your site

Every reefcalcs calculator works as a standalone embed. Drop the iframe code below into a forum post, club blog, fish-store page, or Notion doc — the calculator runs with a stripped-down chrome and links back to the full page. Free for any non-commercial reuse; commercial sites are also welcome, attribution appreciated but not required.

Pick a calculator

Calculator

Height (px)

Rectangular, cube, cylinder, hex, bow-front. Inches or cm in; gallons and litres out.

HTML embed code

<iframe
  src="https://reefcalcs.com/embed/aquarium-volume/"
  width="100%"
  height="720"
  loading="lazy"
  title="Aquarium Volume Calculator — reefcalcs"
  style="border:1px solid #ddd; border-radius:8px; max-width:800px;">
</iframe>
<p><a href="https://reefcalcs.com/calculators/aquarium-volume/">Aquarium Volume Calculator by reefcalcs</a></p>

Markdown / WordPress embed

[Aquarium Volume Calculator by reefcalcs](https://reefcalcs.com/calculators/aquarium-volume/)

<iframe src="https://reefcalcs.com/embed/aquarium-volume/" width="100%" height="720" loading="lazy" title="Aquarium Volume Calculator — reefcalcs" style="border:1px solid #ddd;border-radius:8px;max-width:800px;"></iframe>

Live preview

How it works

Pick a calculator above — the live preview updates instantly.
Adjust the iframe height for your layout. 720 px works for most calculators; complex calculators (stocking, reef-health) benefit from 900–1200 px.
Copy the HTML snippet and paste it into your page editor. For WordPress, paste into a “Custom HTML” block; for Squarespace, use a “Code” block; for forums that allow HTML, use the BB-code HTML wrapper.

FAQ

Is there a fee?: No. Embeds are free for any reef-club, forum, blog, or commercial site.
Will the embed track my visitors?: The embed loads Google Analytics 4 the same as the main site — page views are aggregated, no personal data. The embed respects the visitor's Consent Mode v2 preference.
Can I link to the embed without using an iframe?: Yes — every calculator has a public URL at https://reefcalcs.com/calculators/<slug>/. Link to that directly; we'd appreciate a follow link, but nofollow is fine too.
Can I customise the colours / branding?: Not currently. The embed inherits reefcalcs's dark theme. A theming API may come later — open an issue on the GitHub repo if you have a use case.

Last reviewed 2026-05-25