Tip Calculator for your website
Tip and total from a bill, and what each person owes once it is split — including the rounding that makes the split come out even. Set the values it should open on, then copy the iframe. Your visitors can change them; the widget recomputes against Rule Calculator and never touches your page.
Who puts this on their site
Restaurant, travel and hospitality pages, where the split and the local convention are the whole question.
Free for commercial use. No key, no account, no tracking script, and nothing loaded from a third party — the iframe points at Rule Calculator and that is the only request it makes. The formula and its source travel with it, so the number on your page is one your readers can check.
Opening values
Set what the widget shows before anyone touches it. Leave a field as it is and it stays out of the URL.
Preview
Paste this
<iframe src="https://rulecalculators.com/embed/tip" width="100%" height="740" style="border:1px solid #e5e5e5;border-radius:12px" loading="lazy" title="Tip Calculator"></iframe>
<p style="font:13px/1.5 system-ui,sans-serif;color:#666;margin:6px 0 0"><a href="https://rulecalculators.com/calc/tip" style="color:#666">Tip Calculator</a> by <a href="https://rulecalculators.com" style="color:#666">Rule Calculator</a></p>Free for commercial use. The one condition is the credit link inside the widget, which is how the calculator stays free. Want the numbers in your own markup instead? The same calculator is a JSON endpoint, or see the full Tip Calculator page with its sources and working.