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Batch Brew Calculator

Coffee dose, grams per liter, and serving count for any batch volume. SCA Batch Brew Standard defaults.

Total water volume for the brew batch

Grams of water per gram of coffee (e.g., 16 = 1:16)

Volume per cup served (default: 8 fl oz / 240 mL)

Above SCA batch target

Stronger than the SCA target. Acceptable for concentrated service with added water or milk.

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How to Use This Calculator

  1. Enter Your Brew Volume

    Type the total water volume for your batch, in liters, milliliters, or fluid ounces. A single carafe is typically 1 to 2 liters. A commercial urn runs 5 to 10 liters.

  2. Set Your Brew Ratio

    Enter the ratio of water to coffee by mass. The SCA target of 55 g/L equals roughly 1:18. The common café starting point is 1:16 (62.5 g/L), which sits at the top of the SCA acceptable range.

  3. Set Your Serving Size

    Enter how much coffee goes in each cup. The default is 240 mL (8 fl oz), the standard North American coffee service. Adjust for espresso-based drinks or smaller cup sizes.

  4. Read the Result

    The result card shows your coffee dose in grams, the dose per liter, number of servings, and an SCA range indicator. The band tells you whether you are in the SCA Batch Brew Standard target zone.

Batch Brew: The Math Most Cafés Skip

Batch brew is where most cafés actually live: a commercial brewer, a 1-gallon airpot, a timer set for the morning rush. Getting the dose right is simple math that almost everyone eyeballs, which is why so much batch coffee tastes wrong. The SCA’s Batch Brew Standard targets 55 g per liter of water (roughly 7.5 g per 6 oz cup). If your café is using a coffee scoop and “it looks about right,” this calculator will tell you whether you’re anywhere near that target.

The ratio convention is worth naming explicitly. Batch brew at 1:18 lands at 55.6 g/L, which is essentially the SCA target. The common barista shorthand of 1:16 runs slightly stronger at 62.5 g/L, still within the 50–60 g/L acceptable range, but at the top. Neither is wrong; they produce measurably different cups. Know which one you’re using before you scale for a 10-gallon urn.

Serving math is often wrong because people conflate brew volume with drinkable volume. A 1-gallon batch yields roughly 16 × 8 oz cups, assuming no evaporation and no residual left in the carafe. In practice, plan for about 90% yield from batch volume to cups served.

Ratio, Water Quality, and Scaling

Water quality matters more in batch brew than in most methods because you are running high volumes through the same water profile all day. The SCA Water Quality Handbook recommends 75–250 mg/L TDS for brew water. If you’re outside that range, dose adjustments alone will not fix taste problems caused by mineral content.

When scaling from a test batch to a full urn, keep the ratio constant: multiply dose and water proportionally. The error most operators make is measuring water volumetrically (correct) and measuring coffee by scoop or weight-guessing (incorrect). Use a scale. A 10-gallon urn at 1:18 needs approximately 2,100 g of coffee; a scoop estimate might land you 20% off in either direction.

Ratiog/LSCA BandNotes
1:1471.4 g/LVery strongApproaching cold-brew concentrate territory. Verify your ratio.
1:1662.5 g/LAbove SCA targetCommon café starting point. Strong but acceptable for many operations.
1:1855.6 g/LSCA idealClosest to the SCA 55 g/L target. The recommended starting point.
1:2050.0 g/LSCA idealLow end of the SCA acceptable range. Lighter-bodied cup.
1:2245.5 g/LBelow targetBelow the SCA 50 g/L minimum. Likely too weak for most drinkers.

Frequently Asked Questions

What is the SCA Batch Brew Standard?

The SCA Batch Brew Standard (2016) recommends brewing at 50 to 60 grams of coffee per liter of water, with a target of 55 g/L. That is roughly equivalent to a 1:18 brew ratio. The standard applies to commercial drip brewers, carafes, and airpots: the kind of brewing most cafés do all day.

What brew ratio should I use for batch brew?

The SCA target of 55 g/L works out to about 1:18.2. In practice, most cafés use 1:16 to 1:18. A 1:16 ratio (62.5 g/L) sits at the top of the SCA acceptable range and produces a slightly stronger cup; 1:18 lands right at the 55 g/L target. Neither is wrong. They produce different cups, and which one you use should be a deliberate choice, not something you eyeball.

Why does batch brew use grams per liter instead of a ratio?

Batch brewers measure water volumetrically: you fill to a line, not to a weight. Grams per liter translates directly to that volume measure, which is why the SCA Batch Brew Standard uses g/L rather than a mass ratio. Both describe the same relationship; the calculator shows both so you can work in whatever unit your workflow uses.

How many cups does a batch brew yield?

A 1-liter batch at 240 mL per cup (8 fl oz) yields 4.2 cups. A standard 1-gallon batch is 3.785 liters, yielding about 15.7 cups at the same serving size. In practice, plan for roughly 90% yield from batch volume to cups served due to residual left in the carafe and evaporation during service.

Does water quality affect batch brew?

Yes, water quality has a larger effect on batch brew than on most methods, because you are running high volumes through the same water profile all day. The SCA Water Quality Handbook recommends 75 to 250 mg/L TDS for brew water. If your municipal water is very hard or very soft, it affects extraction rate and apparent strength even at the same dose. Dose adjustments alone will not fix taste problems caused by water quality.

Timberline Coffee School

Trent built this calculator. He also runs Timberline Coffee School, where baristas and roasters train through SCA-accredited programs covering espresso, brew method, and sensory skills.

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