Jomebrew

Beer Stats Calculator

Calculate ABV, calories, and carbs for your homebrew beer. Enter the starting and final gravities — calculations update in real time.

Starting Specific Gravity

Final Specific Gravity

Or use starting and final BRIX from your hydrometer:

Starting BRIX

Final BRIX (after fermentation)

Beer Statistics
Starting Gravity
Final Gravity
Starting Gravity in Plato
Final Gravity in Plato
Real Extract
Apparent Attenuation
Real Attenuation
Alcohol By Volume (ABV)
Alcohol By Weight (ABW)
Calories for 12oz / 22oz
Carbs / 12 oz

Note on carbohydrates in beer. Yeast consume all the simple sugars in most beers. Residual carbs in beer are mostly oligosaccharides, which are not digested by your body. Thus, they do not increase your blood sugar level. Beer can, instead, lower your blood sugar as the alcohol inhibits the breakdown of sugars stored in fat and may even cause hypoglycemia, or too little glucose in your system.

Based mostly on formulas by Charlie Fix and research from around the web. Primetab formulas →

Batch Sparge Calculator

Calculate batch sparge amounts based on John Palmer's How to Brew formulas.

Recipe Original Gravity (points, 1.050 = 50)

Grain Bill (lbs)

Batch Size (gallons, into fermenter)

Boil Volume (gallons, pre-boil)

Water Retention Coefficient

Batch Sparge Calculations
Batch Sparge Mash Ratio
Scale Up Factor
Batch Sparge Grain Bill
First Running Gravity
Second Running Gravity
Pre-Boil Gravity / Calculated Final Gravity
Water Volumes
Mash Water Volume (qt / gal)
Batch Sparge Water Volume (qt / gal)
Total Batch Sparge Mash Volume (qt / gal)

ABV Adjustments

Calculate how much alcohol is needed to raise the ABV — spike sparkling water, or see how adding bourbon affects your beer's ABV.

Example 1: spike 12 oz of sparkling water to 5% ABV by adding 1.7 oz of 40% vodka. Click the starting-volume box and tab to the next field.
Example 2: your beer's starting volume is 640 oz at 7% ABV; add 6 oz of 40% bourbon to find the new ABV.

Starting volume of beer or beverage to raise the ABV (ounces)	oz
Starting percent ABV of the beer or beverage	ABV
Percent ABV of the spirit you are adding	ABV
How much spirit are you adding (ounces)	oz
Spiked Beverage Details
New ABV
ABV of addition volume
New volume of the beverage
Raise the ABV from the Starting ABV Above to a Target ABV
Example: starting volume of beer is 640 ounces (5 gallons) at 7% ABV; you want to raise it to 8% ABV — how much bourbon do you need to add? Fill in the amounts below.
Starting volume of beer or beverage to raise the ABV (ounces)	oz
Starting percent ABV of the beer or beverage	ABV
Percent ABV of the spirit you are adding	ABV
Target ABV	ABV
Amount of alcohol to add

Mash / Sparge Water Volume Calculator

Calculate mash and sparge water volumes based on information from Brew Your Own and around the web.

Grain bill (lbs)
Recipe batch size (gallons)
Boil time (minutes)
Mash-to-water ratio (qts/lbs)
Grain temperature
Target mash temperature
Equipment loss (gal)
Boil-off rate (percent/hr)
Grain absorption rate
Mash / Sparge Water Details
Target strike temp
Mash water
Sparge water
Total water needed

Pitching Rate Calculator

Calculate pitching rate based on Jamil Zainasheff's Brewing Classic Styles. See starter info at mrmalty.com →

Yeast cells to pitch (billion)
A Wyeast smack pack or White Labs vial has about 100 billion cells (70–140). A two-liter starter doubles the yeast cells in a smack pack or vial.
Based on these values:

Change a Recipe to Reach a Target Gravity

Calculations based on the BYO article Calculating Gravity, Bitterness and Color and the chart for grain potential extract or the Homebrew Talk wiki malt chart.

Use this calculator to experiment with adjusting a grain bill to change the gravity of your beer — useful for scaling a recipe to your efficiency, or figuring out how much DME to add to adjust gravity. You can also use it to calculate your efficiency: take your recipe's average PPG, add your original gravity, and adjust efficiency until you get your actual grain bill weight. For example, a 1.044 blonde with a PPG of 38 and 70% efficiency gives 9 lbs of grain.

Gravity points to change
Using max PPG (from HTB)
Using efficiency
Batch size (gallons)
Grain Data
Lbs of grain

Convert Brix to Specific Gravity / Plato

Based in part on Mr. Wizard from Brew Your Own (BYO) magazine's formulas, and John Palmer's How to Brew.

Convert Specific Gravity to Brix / Plato

Based in part on Mr. Wizard from Brew Your Own (BYO) magazine's formulas, and John Palmer's How to Brew.

Convert Plato to Brix / Specific Gravity

Based in part on Mr. Wizard from Brew Your Own (BYO) magazine's formulas, and John Palmer's How to Brew.

Adjust Mash Temperature

Adjust mash temp up or down by adding water at your desired temperature. The bigger the difference between the target and the temp of the water added, the less total water you'll need to add.

Current mash temp (F)
Target mash temp (F)
Total grain weight (lbs)
Total mash volume (quarts)
Temp of water you are adding (F)
Water-to-grain ratio

How Much Beer Is Left In My Keg

Enter the current weight, the weight of the empty keg, and the final gravity of the beer. Old soda kegs (Corny) are usually 9.29 lbs; newer kegs are around 8.6 lbs. Weigh your empty keg first — a digital grain scale works well.