Yeast starter FG question

[k-daddy]

I am embarking on my first attempt at a yeast starter.

1.6 liter starter volume,
OG of 1.040
Erlenmeyer 2 liter flask
Stir plate
70 degree +/-environment

The starter has been on the stir plate now for 36 hrs. now. Just took a gravity reading 1.020. Do I still need more time or is this a normal FG for this starter?

 

[flars]

1.020 seems high but the SG is also a function of which yeast you used. Some English strains will finish with a high SG.

Hydrometer or refractometer for the SG?

 

[k-daddy]

Yeast used is WLP001
Refractometer

 

[sendai]

Try putting your refractometer readings in the calculator below:

http://seanterrill.com/2012/01/06/refractometer-calculator/

I bet you'll find it's really at about 1.010.

 

[k-daddy]

Thanks so much! I completely forgot about the refractometer adjustment calculation needed once alcohol is present.