Jakeorjacob
Member
Bought a refractometer a couple months ago and I'm really enjoying using it to measure pre-boil and OG before adding yeast. However, I was very confused to make a couple batches that I thought were under-attenuated because I kept using the refractometer to find the Brix (and then gravity) of the fermenting wort. I had no idea that the calculation for determining the gravity of fermenting wort is a) different and b) complicated.
So, my two questions:
1. What is the calculation?
2. What websites or apps do people use to find a reliable gravity using the Brix and OG of fermenting wort? I've seen a couple but am getting slightly different numbers from each one.
(I understand that I could just measure gravity using a hydrometer, but I am brewing one gallon batches (at least for a little while longer) and I hate to waste that much wort just to check the gravity. The refractometer works so much better and if I can find a reliable way to calculate, I will be a happy camper!)
So, my two questions:
1. What is the calculation?
2. What websites or apps do people use to find a reliable gravity using the Brix and OG of fermenting wort? I've seen a couple but am getting slightly different numbers from each one.
(I understand that I could just measure gravity using a hydrometer, but I am brewing one gallon batches (at least for a little while longer) and I hate to waste that much wort just to check the gravity. The refractometer works so much better and if I can find a reliable way to calculate, I will be a happy camper!)