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SG, GU and ˚P Conversions

Enter your SG, GU or ˚P value into the appropriate yellow box below and then hit 'Calculate'. (Note: SG and GU vales are calibrated to 20˚C where SG of pure water = 1.000 at 20˚C).

 Units Specific Gravity Gravity Units ˚Plato Abbreviations used in texts SG or sp gr GU or G ˚P Example 1.049 49 12.15 ↓ ↓ ↓ SG GU ˚P

Explanation of the Calculator.
The following equations have been used in the above calculator:

SG to GU

GU = (SG - 1) x 1000

SG to ˚P

˚P = 135.997 x SG3 - 630.272 x SG2 + 1111.14 x SG - 616.868

Note: there are simpler equations out there that estimate this conversion but they are not as accurate.
eg. ˚P = 260 - (260/SG)
If you are doing the calculations by hand you may want to use this formula.

GU to SG

SG = 1000 x GU + 1

GU to ˚P

Convert GU to SG and then convert SG to ˚P using the equations above.

˚P to SG

SG = (˚P / 258.6 - ((˚P / 258.2) x 227.1))) + 1

˚P to GU

Convert ˚P to SG and then convert SG to GU using the equations above.

The equations used in this calculator have been adapted from the following references:

Briggs DE, Boulton CA, Brookes PA, Stevens R (2004) 'Brewing - Science and Practice.' (Woodhead Publishing Limited: Cambridge)

Noonan GJ (1996) 'New Brewing Lager Beer.' (Brewers Publications: Boulder, Colorado, USA) pint.com.au Web

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