also LxWxH/fill power
i pretty much use 5 inch wide Chambers on every quilt but you can make them as wide as you want
say your making a UQ 56x45 and want it 3 season so use 2" baffles
rule of thumb has been 2" for 3 season and 3" for winter it's not set in stone but i found there pretty true in regards to temp ratings
so 56x45x2/800 (fill power) = 6.3oz of down needed for the said airspace
so with 20% overfill around 1.2oz so 7.5oz needed... all you need to do is add up the amount of chambers you made 5" wide at 45" would give you 9 so just divide your amount of down 7.5oz by the amount of chambers 9 ..7.5/9 = .83 or .8oz of down per chamber
this is just another way to do it ...figured i would put it out there to give you another option
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