Precision Aerodynamics claims to use the measuring standards created by the PIA (Parachute Industry Association)
Performance Designs uses another method.
At the PIA Symposium 2000 in San Diego, CA Simon Mundell stated that in order to be more competitive in the High Perfomance Canopie market, Icarus Canopies USA would change which measuring method the used.
Examples of PIA Standards:
A PDR 126 measures 137 sq ft.
A Micro Raven 135 measures 134 sq ft.
A Sabre 135 measures 143 sq ft.
A Monarch 135 measures 140 sq ft.
Unfortunately the newer models of canopies are not listed yet.
In the end, manufactures can measure any way they choose because there is no regulating body to enforce standards in sizing.
Blue Skies,
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You're not as good as you think you are. Seriously.