http://twoloonscoffee.com/map/bp.php?elevation=2345&barometric=28.82 If you want to skip the barometric part, leave off that paramater, and the "standard" pressure of 29.921" Hg. will be used. http://twoloonscoffee.com/map/bp.php?elevation=2345 Now for SI units as well: elevm = meters barom = millibars (hPa) so, as above, you'd do something like, http://twoloonscoffee.com/map/bpm.php?elevm=1234&barom=1010 If you'd like to include these calculators on your site, simply make up an HTML form with inputs for elevation and (optionally) barometric pressure. The key lines in your form will be either or both of these:
<form method="get" action="http://twoloonscoffee.com/map/bp.php">
<form method="get" action="http://twoloonscoffee.com/map/bpm.php">
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