Originally Posted by MAD777
Simply multiply the fill power times the ounces of down then divide that result by the length, and width of the quilt. That will give you the effective loft. Each inch of loft is equivalent to approximately 18*F. Do this for the different amounts of fill that you are considering and you can then see the effect of overfilling.
For practical purposes, don't worry about any compression from over stuffing. You can compress down in half it's normal loft without degrading it's insulating properties.
im a bit confused with this equation, are you multiplying the length and width together before you divide everything else by it, resulting in this equation
(Fill power x Ounces down)/(LxW)
or are you dividing by one and then taking the value and dividing it by the other resulting in this equation
((Fill power x Ounces down)/(L))/(W)
or are you simply adding L&W together resulting in
(Fill power x Ounces down)/(L+W)
Also, 18*F from what, 100* 75*, assuming you subtract this