Final gravity too high

I have an IPA that I've brewed in five gallon batches before. OG at 1.065 and FG at 1.010. Those were hydrometer readings.

I scaled it down for a one gallon batch, and pitched half a packet of yeast (Safale US-05) instead of a full packet. My OG was 1.060 using a refractometer, but my FG is reading 1.041 after 2.5 weeks of fermentation.

Is something throwing the refractometer off? I haven't had this issue before.

Maybe I under-pitched? But half a packet of yeast for a one gallon should be plenty, right?

Thanks.

Topic refractometer final-gravity original-gravity yeast fermentation homebrew

Category Mac

1
answered at

If you're measuring FG with a refrac, you need to compensate for alcohol. Alcohol in solution will increase the apparent gravity in a refrac. For this exact reason, I never measure gravity with a refrac after I've pitched yeast.

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