Gravity Maths

[JammyBStard]

Lil help please; I keep trying to work this out; but I get a different result each time:

I had a starting gravity of 1.057 (9.5L brew)
After primary had finished I added 500ml of steeped Hop tea at 1.000 (Up to 10L)
Final Gravity is 0.006 (Very Dry!)
The calculated ABV is 5.86% but obviously that would be wrong; How would I work out the actual ABV?

[vacant]

Adding 0.5L to 9.5L dilutes by roughly 5%, so your OG could be corrected to 1.054 (5% of 57 is about 3)
54-6 = 48
48 x 0.131 = 6.288%

http://customs.hmrc.gov.uk/channelsPort ... t#P72_6058

[JammyBStard]

Adding 0.5L to 9.5L dilutes by roughly 5%, so your OG could be corrected to 1.054 (5% of 57 is about 3)
54-6 = 48
48 x 0.131 = 6.288%

Cheers V
I actually gave you the wrong numbers, sorry, But the maths works.

So the brew is:

2.30 kg Pale Malt, Maris Otter (3.0 SRM) Grain 90.20 %
0.15 kg Caramel/Crystal Malt - 20L (20.0 SRM) Grain 5.88 %
0.10 kg Barley, Flaked (1.7 SRM) Grain 3.92 %
7.00 gm Magnum - Craftbrewer - Magnum hop pellets. USA - Crop '07 (AA 12.5%) [12.50 %] (55 min) Hops 19.6 IBU
5.00 gm Magnum - Youngs Flower 15.5% [15.50 %] (40 min) Hops 14.1 IBU
15.00 gm Amarillo - Craftbrewer - Amarillo hop pellets. USA - Crop '07 (AA 8.2%) [8.20 %] (10 min) Hops 10.2 IBU
9.00 gm Chinook - Craft Brewer - Chinook hop pellets. USA - Crop '07 (AA 11.1% [11.10 %] (5 min) Hops 4.6 IBU
1.11 items Whirlfloc Tablet (Boil 15.0 min) Misc
10.00 L York East WSZ Water
1 Pkgs Nottingham - Barley Bottom (Danstar #-) Yeast-Ale

Late Steep at 5 Days in with Amarillo and Chinook
Add 2g/L with minimum Water 30min @80'c Use Coffee filter to seperate and add to the FV

Beer Profile
Est Original Gravity: 1.057 SG
Measured Original Gravity: 1.049 SG
Est Final Gravity: 1.014 SG
Measured Final Gravity: 1.006 SG
Estimated Alcohol by Vol: 5.67 %
Actual Alcohol by Vol: 5.60 %
Bitterness: 48.5 IBU
Calories: 450 cal/l
Est Color: 6.4 SRM

I always get a very low finishing SG but that's the lowest yet; I'm not sure why!

[Spud395]

What temp do you mash at? Have you checked your termometer, low mash temps lead to a more fermentable wort

[JammyBStard]

I did mash 65'C for a light body but Beer Smith still predeicted an FG of 0.014 with the efficiency set to 72% but I nearly always go below Beersmith FG.
I do have an excellent room for fermenting where the temp stays within 1' of 19'c all the time, perhaps it's a factor.
It's not a big problem; I like a dry beer, but it can be a bit thin tasting when it goes that low.

[gnorwebthgimi]

Take a temperature reading of boiling water and see if your thermometer is out.

It should read 100'c or ever so slightly less if you're significantly above sea level.

You could also take the temperature of ice water, it should be about 0'c - 1'c.

[JammyBStard]

I know my thermometers are good, i always use glass thermo's never digital anymore they're more trouble than they're worth. And I think York is at about sea level.