Cirrus SR22 Pilot Operating Handbook page 463

Cirrus Design Section 9
SR22 Supplements
10. Record the new weight and C.G. values on the Weight and
Balance Record.
The above procedure determines the airplane Basic Empty Weight,
moment, and center of gravity in inches aft of datum. C.G. can also be
expressed in terms of its location as a percentage of the airplane
Mean Aerodynamic Cord (MAC) using the following formula:
÷
C.G. % MAC = 100 x (C.G. Inches – LEMAC) MAC
Where:
LEMAC = 133.1
MAC = 47.7
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Revision 03: 05-09-11