conversion question

[Gotta brew]

When converting liquid extract to dry, what is the ratio? Iknow i seen it somwhere and 1 lb = .85 lbs. sticks in my mind. Does that sound right?
Thanks

[Barley-Davidson]

Converting from liquid to dry reduce by 17%
From dry to liquid increase by 20%

[Lerxst]

Barley D: I am totally missing something? Wouldn't it be the same factor in both conversions?

Edit: What you are accounting for in your conversion is the increased fermentability/gravity points of DME over LME by weight because part of LMEs weight is water. Various sources put this difference at 20-25%. Palmer states "aproximately 20%." So using that as a starting point, you would you use 20% more LME than DME for a given gravity/GP and conversly 20% less DME than LME to achive the identical gravity/GP.

[Barley-Davidson]

I took the conversion percentages from papazian, but they make sense.

Say a recipe calls for 6# DME; converted to LME it's 7.2# (6x1.2=7.2)
If a recipe called for 7.2# of LME; converted @ a 20% reduction you end up a quarter pound short of DME (7.2x.8=5.76)
The same conversion done at 17% is much closer (7.2x.83=5.976)

In practical application the difference is pretty negligible and rounding to 20% either way will work, that's the reason for the different percentages.

[Barley-Davidson]

Upon further review -
If you do the math like this the % stays constant:

DME to LME: DME x .8 = LME
LME to DME: LME / .8 = DME

I never claimed to me a mathlete