Standard Brewing Ratio 1:16


Cups of 
Coffee
COFFEE TO BE USEDWATER TO BE USED
BY WEIGHTBY MEASURE
OuncesGramsTea
Spoons
Table
Spoons
CupsFluid 
Ounces
CupsPintsQuarts CCs 
(milliliters)
Liters
10.3810.6621/863/43/83/161770.18
20.7521.31241/4121 1/23/43/83550.35
31.1331.91863/8182 1/41 1/89/165320.53
41.5042.52481/22431 1/23/47100.71
51.8853.230105/8303 3/41 7/815/168870.89
62.2563.836123/4364 1/22 1/41 1/810651.06
72.6374.442147/8425 1/42 5/81 5/1612421.24
83.0085.14816148631 1/214201.42
93.3895.754181 1/8546 3/43 3/81 11/1615971.60
103.75106.360201 1/4607 1/23 3/41 7/817751.77
114.13116.966221 3/8668 1/44 1/82 1/1619521.95
124.50127.672241 1/27294 1/22 1/421302.13

It is important to note that measuring by volume is not as precise due to the fact that different coffees can have different densities.  Measuring by weight is the only way to be precise.

This chart uses a 6 oz “cup”. Some machines figure a 5 oz “cup”, don’t ask me why these discrepancies exist! To determine what your machine is, simply fill and measure the carafe in ounces dividing by the number of cups its rated for.

Remember this is the “Brewing Ratio” for many this could likely be too strong a “Drinking Ratio”. There’s nothing wrong with “cutting” the brew strength by adding hot water to taste! This is esp true with Aeropress and to a lesser degree with the pour-over methods of brewing. Although to be fair, I usually do adjust the brew ratio to 1:15 with these brew methods. The brew ratio is easiest to understand thinking in grams (One gram coffee for fifteen grams water).

BUNN’s RECOMMENDED BREWING RATIOS (Taken from their web site)

Water (5 oz “cup”)  Coffee
4 Cups/20 oz         32 grams~2.5 tbsp
6 Cups/30 oz         49 grams~3.5 tbsp
8 Cups/40 oz         65 grams~4.5 tbsp
10 Cups/50 oz       81 grams~5.5 tbsp