ClutchCalcs

Baking

Coffee Ratio Calculator

The difference between a good cup and a great cup of coffee usually isn't the beans — it's the ratio. Eyeballing two tablespoons of grounds per cup of water gives you wildly different strength depending on bean density, roast level, and how much your scoop holds. Weight-based brewing eliminates all that variance. Pick your brew method (pour-over, V60, Chemex, drip, French press, AeroPress, or espresso), enter water volume in grams or cups, and get the exact coffee weight you need for a balanced, repeatable brew. Tweak strength up or down by 15% from there.

Brewing ratios by method

  • Drip coffee maker: 1:17 (60g per liter). SCA Golden Ratio for filter coffee.
  • Pour-over (general): 1:16 (62.5g per liter). Slightly stronger than drip.
  • V60 (Hario): 1:15 to 1:16. James Hoffmann's recipe is 30g coffee to 500g water (1:16.7).
  • Chemex: 1:14 to 1:16. Chemex's thicker filter pulls more, so a stronger ratio compensates.
  • French press: 1:12 to 1:15. Stronger because the immersion brew extracts more.
  • AeroPress: 1:12 to 1:15 for standard recipe; 1:5 to 1:8 for the concentrate-and-dilute method.
  • Espresso: 1:2 (a "normale" — 18g coffee in, 36g espresso out).
  • Cold brew: 1:8 (concentrate, diluted 1:1 with water before serving). Or 1:15 for ready-to-drink cold brew.

Why weight beats volume

A tablespoon of fresh-roasted Ethiopian Yirgacheffe and a tablespoon of dark Italian roast can vary by 30-40% in weight — darker roasts are less dense because they've lost more moisture in roasting. Same volume measure, very different brewing strength. Weight (grams) is the universal language across roasts and bean origins.

A cheap kitchen scale ($15-30) that reads in 1-gram increments is the single biggest upgrade most home brewers can make. Better than a fancier coffee machine, better than more expensive beans.

Worked example: 500g water (about 2 large mugs of coffee) at 1:16 ratio. Coffee = 500 / 16 = 31.25g. Round to 31g and use that as your starting recipe. Strong tweak (15% stronger) = 36g. Mild tweak (15% weaker) = 27g.

How to use this calculator

  1. Pick brewing method: the ratio defaults match SCA + barista convention.
  2. Strength tweak: standard, strong (-15% water/cup, or +15% coffee), mild (+15% water/cup, or -15% coffee).
  3. Water in grams (or cups, where 1 cup = ~237g of water).
  4. Output: coffee weight in grams, plus the ratio applied.

Common scenarios

Morning V60 pour-over, single 12-oz mug. Water = 355g (12 oz). Ratio 1:16 = 22g coffee. Grind medium-fine, brew 3-4 minutes, classic pour-over technique. The most well-loved daily ritual recipe.

French press for 2 people, 1 liter water. Water = 1000g. Ratio 1:12 = 83g coffee. Coarse grind, steep 4 minutes, plunge slowly. A bigger ratio than pour-over because immersion extracts more efficiently.

Double-shot espresso pull. 18g coffee in (the standard double-basket dose). 1:2 ratio = 36g espresso out. Pull time 25-30 seconds. The classic "normale" espresso recipe used by most third-wave shops.

FAQ

What's the SCA Golden Ratio? +
Specialty Coffee Association recommends 55g coffee per liter of water (1:18) for drip-style brewing. Many third-wave baristas have pushed this to 1:15-1:16 for fuller body. The "correct" ratio is subjective — try 1:16 as a starting point and adjust to taste.
How does grind size affect the ratio? +
Grind size controls extraction rate, not the total amount of extractable material. A coarser grind under-extracts (bitter/sour); finer grinds over-extract (bitter/burnt). For each brewing method, there's a target grind window. Adjust grind first to dial in flavor; adjust ratio for overall strength.
Why does my coffee taste sour / bitter? +
Sour = under-extracted (grind finer, brew longer, or hotter water). Bitter = over-extracted (grind coarser, brew shorter, or cooler water). Ratio affects strength (concentration) but not extraction (% of bean dissolved). Both matter; troubleshoot in that order.
Is dark roast "stronger"? +
No — dark roast has less caffeine per gram (it gets burned off in roasting) and slightly less extractable solids. Dark roast tastes "stronger" because the roast flavors (bitterness, smokiness) dominate. Light roast is actually slightly higher in caffeine and total extractables.
What temperature should brew water be? +
195-205°F (90-96°C) for most methods. Drip machines run 195-200°F. Pour-over and French press: 200-205°F is the sweet spot. Cold brew obviously uses room or refrigerator temperature, extracts much slower (12-24 hours), and produces a smoother, less acidic result.
Can I scale this for big batches? +
Yes — the ratio holds across batch sizes. A 2-liter brew at 1:16 needs 125g of coffee. Just remember that very large batch sizes need more brewing time (the water has to extract from more coffee) and may benefit from a slightly larger grind to compensate.
What about milk drinks (latte, cappuccino)? +
Use espresso strength (1:2) for the espresso shot, then add milk independently. A typical cappuccino: 30-40g espresso + 120g steamed milk. A latte: same espresso + 200-300g steamed milk. Ratio of coffee-to-milk in the final drink is the latte/cappuccino spec, separate from the brewing ratio.
How fresh do the beans need to be? +
For peak flavor: 5 days to 4 weeks after roast date. Beans rest 5-7 days post-roast to off-gas CO₂ (especially important for espresso). After 4 weeks, flavor degrades noticeably; after 8 weeks, beans taste stale. Whole bean is much more shelf-stable than ground — grind fresh, daily, for best flavor.