I have been trying to get a sense of temperature rating based on fill power and fill weight. I'm sure somewhere there is an equation but in all my searching I couldn't find it. So I took the specifications from Hammock Gears quilts to derive one. I plotted the data and noticed linear trends based on fill power and on the fill weight. From that I derived the following parameters.
mm = -0.005965761
bm = 0.80763296
mb = 0.012018967
bb = 60.8219645
T = temperature
FP = fill power
FW = fill weight
T = (mm * FP + bm) * FW + (mb * FP + bb)
Rechecking the formula, I get values close enough to the Hammock Gear specs to feel like I can use to get a ballpark idea of temperature rating for a down product.
I'm curious if anyone has something better.
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