Measuring Efficiency and temperature

[tomaso]

Hi, noob question from a nooob (am on my sixth batch : measured preboil wort today for efficiency and I got a reading of 1040 which, with my grain bill came out as 25.2ppg. Not so nice

I took the reading when the sample was still warm... (about 40C I guess). Does that influence the calculation? I.e. Should I have waited until it cooled down?

Thanks anyone for answering that basic question for me!

 

[-Liam-]

Temperature will have an effect on your gravity readings. I use this tool to find out the correct temperature calibrated readings... http://www.brewersfriend.com/hydrometer-temp/

 

[tomaso]

Nice. Thank you.
So assuming it was about 40C with the correction my efficiency would have been about 28ppg. quite OK!