Put this calculator on your site
Free to use, on any site, commercial or not. No signup, no account, no JavaScript to install, and nothing that tracks your visitors. Copy the snippet and you are done.
Preview
The snippet
<iframe
src="https://overtimemath.com/embed/time-and-a-half"
title="Time and a half calculator"
width="100%"
height="400"
style="border:1px solid #e5e2dc;border-radius:12px;max-width:640px"
loading="lazy"></iframe>
<p>
<a href="https://overtimemath.com/time-and-a-half-calculator">Time and a half calculator</a>
by Overtime Math
</p>Who this is for
HR and payroll blogs, employment law firms, union locals, staffing agencies, bookkeepers, and anyone writing about pay who would rather not build a calculator. The maths is the same one running on the time and a half calculator, kept correct here so it stays correct on your page.
The one condition
Keep the credit line under the frame, and keep it visible. That link is the whole price of the calculator. Hiding it or removing it is the only thing that is not allowed, and a hidden link would count against your own site as well as this one.
Changing the size
Width is already fluid, so it fills whatever column you put it in. The height is fixed at 400 pixels because a frame cannot measure itself from the outside. That was measured, not guessed: the calculator needs 367 pixels in a narrow phone column and 362 at full width, so 400 fits both with room for a theme that sets larger text. Raise it if you ever see a scrollbar. There is no resize script to install, on purpose, because a script is one more thing that can break on your site.