Hello all!
I brewed Tasty’s Session Pale ale today. I ended up getting a OG for 1.040 instead of 1.044, so I added some DME.
I had approximately 2.75 gallons of 1.040, and i made 1200 ML of 1.100 wort and added it. What would that bring my OG to? And what is the math to figure this out?
Thanks a ton!
~Adam
Why not just test it again?
Well im actually going to, but i was curious of the math?
One lb of DME. Will yield ~45 gravity points per gallon
So 45/2.75g=~16 gravity points or 1.016
I think I did that right…?
hmm i took a sample and it seems, i only got 1 gravity point =(
I’m no math major but google tells me there are 3785ml in a gallon and you added 1200ml into 2.75 gallons so that’s about 1/4 of your 1.10 wort which if I’m estimating this all correctly would equate to your 1 gravity point
Sorry, I’m definitely not a master of these calculations…perhaps someone more experienced can chime in:)
First, you need to straighten out your units. So 1200 ml converts to about 40.5 ounces which is about .316 gallons…
Figure “points” by multiplying the volume by the gravity (without the 1. part)…
2.75 gallons times 40 gives you 110 “points”; .316 gallons time 100 gives you 31.6 “points”; so you’ve got a total of 141.6 “points”.
Divide that by 3.066 gallons (2.75 & .316) and you should end up with a gravity of about 1.046
Since a lb of DME gets ~ 45 points/lb/gallon, if you take the 45 points and divide by 5 (for a 5 gallon batch or whatever number for your batch size), you get 9 points for the lb in a 5 gallon batch. Then divide the number of points you want to increase your gravity by 9 to get the lbs of DME to use.
This I knew but the conversions with gallons and ml were throwing my feeble math mind.
Thanks hokerer for the math lesson!
Thank you for the input guys, there definitely is a lot to it. i wonder if my reading wasn’t mixed well enough only showing me .01 in gravity raise.
Figured you did , dude. Just put it out there for amh001, in case. Those ml conversions are a little trickier though.
OWell let’s see, there’s about 5 ml in a teaspoon. …
The problem is mixing patriot measuring with metric. Too much thinkin involved.
Divided by gallons of high quality h2O
Cane sugar is 46 pts lb
DME is 45 pts lb
LME is 36 pts lb
1 lb DME per 2.5 gal = 18 pts
You can do it backwards too.
2.5 gallons of 1.060 becomes what when you add 2.5 gallons of h2O,
2.5 x 60 = 150 total pts
Add 2.5 gallons
150 divided by 5 = 30 or 1.030
Oh! I don’t do any math I don’t have to, so naturally I didn’t tumble to the idea that you wanted to just for the ‘joy of math.’ In my world ‘joy of math’ is an oxymoron.
Most likely. Wort will stratify particularly when you are topping off or adding additional wort as you did.
If the reading seems off, mix well and check again. I get crazy high readings if I haven’t mixed my top off water into the wort very well.