And does it help you make a better quilt?
I always start in a different fashion.
I calculate the fabric area i need and buy that.
That includes baffels.
I cut the baffels to desired height and sew it all together.
However many you need to prevent serious down migration.
I have a target fill weight in mind and divide that by the number of baffels and bang-you have the weight of down per baffel.
The overall weight can be THEORETICALLY calculated by area of fabric as follows-
Say the finished size is 2m x 1.2 m and 10 baffels at 80mm high(including sewing allowances)
1.2 x 2 = 2.4m².
Weight of fabric = 15gsm
Baffels 2m x .08m =.16m²
Total fabric weight is (2.4 + .16) × 15
=38.4 grams.
If you want 700grams of down total weight is 38.4 + 700
=738.4 grams.
Although you use a few meters of thread(estimate of 47m) the weight is inconsequential.
So the finished weight is somewhere between 739 grams and 745 grams.
BUT WHY BOTHER-it will be whatever it weighs when finished-and you might even put water repelant breathable material(spray) on increasing the weight more and a compression bag for transport with a built in storrage bag for when not in use!.
Still less than 1000grams.
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