Part of Our Homebrew Tips and Tricks Series.  Check out the complete list – Homebrewing Tips, Tricks & Shortcuts!

• Forgot to take an original gravity and still want an estimate of ABV?  No problem.  You’ll need a refractometer and a hydrometer.
• Take careful measurements with each.  Thoroughly de-gas the sample to get a more accurate reading.
• Run those numbers through this equation.  SG is the gravity reading obtained from the hydrometer,  Brix is the reading obtained from the refractometer.  ABV = [277.8851 – 277.4(SG) + 0.9956(Brix) + 0.00523(Brix2) + 0.000013(Brix3)] x (SG/0.79).
• This is a great reason to get a refractometer.  There are many offerings and they can change quickly.  Shop Around, Search Amazon for “dual scale refractometer” to compare prices and see what models are currently available.
• More reasons to get a refractometer!  See Tip 9.
• Thanks to BYO for this formula.  Not a subscriber?  Subscribe to BYO
• Related Categories: Fermentation, Refractometers

Make sure the components you use are compatible and rated for your intended application.  Contact manufacturer with questions about suitability or a specific application.  Always read and follow manufacturer directions.


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