Try the AMP one here>>> https://www.amp.com.au/wps/portal/au/AMPAUGeneral3C?vigurl=%2Fvgn-ext-templating%2Fv%2Findex.jsp%3Fvgnextoid%3Da498a451359c2210VgnVCM10000083d20d0aRCRD use the AMP servicibilty calculator and open the user guide (adjacent to it on the web page) to help you decipher it...
