If you like handy online tools, check this out,

I came across this <b>free AI-powered calculator</b> that gives <b>instant, accurate results</b> for everyday tasks from finance to fitness.
It’s part of the <b>SmartCalc</b> collection built for speed, accuracy, and simplicity.

<b>Try it here:</b>
<a href=https://heart-rate-zone-calculator-fitness.blogspot.com/>SmartCalc Online Tool</a>

No signup, no ads just clean and simple calculators that actually work.
If you like data-driven tools or quick results without spreadsheets, this is worth a look.
Hope this helps!