The original calculator has been upgraded by Lee, N2LEE to incorporate feet and inches.
This is a Microsoft Excel format.
https://dxcommander.com/wp-content/uploads/swr-calculator-metric-and-imperial-by-N2LEE.xlsx
You can still use a regular browser over at the original one.
https://www.m0mcx.co.uk/quick-swr-calculator-for-vertical-and-dipole-ham-radio-antennas/
