SGR Calculation
Calculations of SGR are as follows;
consumption rate (lb/kg/etc per hr) / ground speed (kts) = lb/kg/etc per nm
OR;
ground speed (kts) / consumption rate (lb/kg/etc per hr) = nm per lb (or whatever you’ve used)
Consumption Rate
This is calculated by taking TAS and dividing by SAR (Still air range)
TAS / SAR (nm per lb) = lb per hour
OR;
TAS * SAR (lbs per nm) = l per nm