If I want to convert my specific gravity reading from one temperature to an equivalent specific gravity at 60F how do I do it?
Can you give me a correction factor for this case?
Topic specific-gravity calculations temperature homebrew
Category Mac
jsled's answer is for when you are using a hydrometer calibrated to 59 degrees F.
The formula to correct a reading for any hydrometer calibration temperature is as follows:
cg = corrected gravity
mg = measured gravity
tr = temperature at time of reading
tc = calibration temperature of hydrometer
cg = mg * ((1.00130346 - 0.000134722124 * tr + 0.00000204052596 * tr2 - 0.00000000232820948 * tr3) / (1.00130346 - 0.000134722124 * tc + 0.00000204052596 * tc2 - 0.00000000232820948 * tc3))
You can also use a correction table like the one HERE.
You just add or subtract the difference from 1.000 at 60 with the temp you are at.
I hate quoting John Palmer, but he also has a table in Appendix A of Hot to brew.
All temperatures are in expressed in degrees F.
correction = 1.313454 - 0.132674*F + 0.002057793*F*F - 0.000002627634*F*F*F
SG_corrected = SG + (correction * 0.001)
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