Our Thanks to DEER & DEERHUNTING Magazine for the use of this information.
Carcass weight = Field-dressed weight divided by 1.331
Ideal boneless venison weight = Carcass weight multiplied by .67
Realistic venison yield = Ideal boneless weight multiplied by .70
Let's say a hunter kills a mature buck, and it weighs 165 pounds field-dressed. Using the above equation, we estimate its carcass will weigh 124 pounds, and it will ideally yield 83.08 pounds of boneless meat. The deer's realistic meat yield is about 58.15 pounds.
Because waste can vary between deer, we suggest using the "realistic" figure as a gauge. In the above example, the buck's realistic meat yield would range form 58 to 68 pounds. A 10-pound difference doesn't seem like much when dealing with a large deer , but it's noticeable when the deer is a fawn or yearling.
I would have expected more like 30 pounds of meat.