Embed Sum Calculator

Add a fully-featured Sum Calculator to your own pages with a simple <iframe> tag. No back-end, no API keys—just copy, paste, and start totalling numbers on any site.

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One-line install

Drop the iframe anywhere in your HTML

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Responsive

Scales automatically inside flex or grid layouts

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Private & ad-free

All calculations stay in the visitor's browser

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Custom start values

Pre-fill lists such as ?values=10,20,30

Quick Embed Guide

1. Choose size

Width (px)

Height (px)

2. Optional: pre-load numbers

4. Save & test

3. Copy iframe

<iframe
  src="https://sumcalculator.org/tools/sum?values=10%2C20%2C30"
  width="800"
  height="600"
  frameborder="0"
  scrolling="auto"
  title="Sum Calculator">
</iframe>

Totals appear instantly inside your page.

Popular Uses

Context	How Sum Calculator helps
Lesson pages	Embed next to practice problems so students can verify answers.
Financial dashboards	Totals small tables without opening a spreadsheet.
Data-entry forms	Let staff confirm column sums before submission.
Blog tutorials	Demonstrate CSV parsing by pre-loading sample values.

Implementation Tips

•Wrap the iframe in a max-width:100% container to keep it responsive.
•For pages that lazy-load content, add loading="lazy" to the tag.
•Use a descriptive heading like "Sum Calculator" above the widget for clarity and accessibility.
•Provide a fallback link (View full-screen) for mobile users who prefer a dedicated tab.

Need Help?

Open an issue on GitHub or email hello@sumcalculator.org—we reply within one business day.