Clara Bennett, CQI Q Grader, SCA Roaster · Last reviewed July 13, 2026

Coffee to Water Ratio Calculator

The coffee and water ratio for every brew method, turned into your exact numbers. Tell it how many cups you're making — or how much water or coffee you have — and get the grams, tablespoons, and scoops for drip, pour over, French press, AeroPress, Moka pot, cold brew, and espresso. No signup, no ads.

Coffee to water ratio calculator: pick a brew method, tell it how many cups you're making (or how much water or coffee you have), and see the exact grams of coffee and water, the ratio, tablespoons, and scoops.

That number looks off — try cups between 1 and 100, or a water amount above zero, and the exact coffee and water for your brew appear here.

Ratios are a starting point, not gospel. Grind size, bean density, roast level, and your own taste all move the dial. Weigh your coffee on a scale for repeatable cups — the tablespoon and scoop figures are approximate (a level tablespoon of ground coffee runs 5–7 g depending on grind). Reviewed by Clara Bennett, CQI Q Grader.

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How to use this calculator

  1. Pick your brew method. Seven methods, each with its own sensible ratio baked in — because a drip machine, a French press, and an espresso machine are three different recipes, not one "golden number."
  2. Choose where you're starting from. Most people think in cups, so that's the default: pick how many, and — crucially — which cup. A drip machine's "cup" is 5 fl oz, a classic coffee cup is 6, your kitchen mug is closer to 8, and a travel mug is 12. You can also start from a water amount (grams, milliliters, or fluid ounces) or from the coffee you have left in the bag and let it work backwards to the water.
  3. Set the strength. Mild, Balanced, or Strong nudges the ratio within the sane range for the method — the exact 1:X each button uses is printed right on it. Want a number that isn't on the menu? Tap Custom ratio and type your own.
  4. Read your recipe. Grams of coffee (weigh this), water, the ratio, tablespoons and scoops as a backup, and how much actually ends up in your cup after the grounds keep their share. It recalculates on every change — there's no Calculate button.
  5. Keep it. Copy the recipe as text, share a link that reopens the calculator with your exact settings, open the batch table for 1–12 cups, or download a brew card PDF for the fridge door.

Why this coffee-to-water ratio calculator is different

There are plenty of ratio pages out there. Most of them do one or two things well and stop. Here's what this one does that the typical page doesn't:

  • It answers the "cup" question honestly. Most calculators assume one cup size and never say which. This one makes you pick — 5 oz carafe cup, 6 oz coffee cup, 8 oz mug, or 12 oz travel mug — because "how much coffee for 12 cups" means nothing until you know a drip machine's cup is only 5 fl oz.
  • Espresso is included, correctly. Almost every ratio tool skips espresso or forces water-in math onto it. Espresso is dose to beverage yield — 18 g in, 36 g out at 1:2 — and this calculator switches to that model automatically, ristretto to lungo.
  • It works in both directions. Down to the last 40 g in the bag? Start from the coffee you have and it tells you how much water to brew, instead of the other way around.
  • It tells you what lands in your cup. Spent grounds hold onto roughly 2 g of water per gram of coffee, so a 1,000 g brew doesn't pour 1,000 g of coffee. Almost nobody shows this; it's why your "4 cups" of water comes out as 3½.
  • It's shareable, printable, and embeddable. Share-a-link recipes, a 1–12 cup batch table, a branded PDF brew card, and a free embed for your own blog — with the math cited to published standards below and a fixture test running on every build so it can't quietly drift.

How it works (the math behind the cup)

A brew ratio is grams of coffee to grams of water, written 1:X. Water weighs 1 gram per milliliter, so the whole calculation is a handful of one-line conversions: 

water_g  = cups x cup_size_mL        (carafe cup 148 / coffee cup 177 / mug 237 / travel 355)
coffee_g = water_g / ratio            (ratio = the X in 1:X)
tbsp     = coffee_g / 5               (1 level tbsp of grounds is about 5 g; 1 scoop = 2 tbsp)
in_cup   = water_g - 2 x coffee_g     (spent grounds retain ~2 g water per g of dry coffee)
espresso: yield_g = dose_g x ratio    (dose:yield, e.g. 18 g x 2 = 36 g double shot)

The ratios themselves are conventions, anchored to published standards: the SCA's Golden Cup range (roughly 55 g of coffee per liter, near 1:18) sets the drip anchor; the widely-cited French press "golden ratio" of 1:15 matches our dedicated French press calculator; cold brew uses the ready-to-drink 1:8–1:12 band from our cold brew calculator; and espresso uses the modern café-standard 1:2 dose-to-yield, with ristretto near 1:1.5 and lungo near 1:3. Every method's Mild/Balanced/Strong presets stay inside the range serious roasters publish — and the custom-ratio field is there for the day your beans disagree.

Three recipes from the calculator

A full 12-cup drip carafe

Twelve cups on the machine, Balanced (1:17). The calculator reads a carafe cup as 5 fl oz — so that's 1,776 g of water and 104 g of coffee, about 21 level tablespoons. That's more than the "one scoop per cup" folklore says, which is exactly why weak office coffee tastes the way it does. If your drip machine is the bottleneck instead, start with our best drip coffee maker reviews.

Two mugs of French press, balanced

Two 8 oz mugs at the classic 1:15 gives 474 g of water and 32 g of coffee (about 6½ tablespoons), ground coarse. After the grounds keep their ~64 g, you'll pour right around 14 fl oz — two honest mugs, not the "where did my coffee go" surprise a water-only calculator sets you up for.

The last 30 grams in the bag

Switch to Coffee I have, type 30 g, leave it on drip Balanced (1:17), and it works backwards: 510 g of water — a small carafe, or a bit over 17 fl oz in the cup once the grounds take their cut. No more guessing whether the end of the bag is worth brewing.

Frequently asked questions

What is the best coffee-to-water ratio?

For most brewing methods, start between 1:15 and 1:18 — one gram of coffee for every 15 to 18 grams of water. The SCA's Golden Cup standard sits near 1:18; most specialty shops brew drip and pour over around 1:16–1:17 and French press at 1:15. There is no single correct number: tighter ratios (1:13–1:15) drink bolder, looser ones (1:17–1:18) drink lighter and sweeter. Pick Balanced above and adjust by taste.

How much coffee per cup?

At a 1:17 drip ratio: about 9 g (just under 2 tablespoons) per 5 oz carafe cup, 10–11 g per 6 oz coffee cup, and 14 g (nearly 3 tablespoons) per 8 oz mug. The "2 tablespoons per 6 ounces" rule of thumb you'll see printed on coffee bags is the strong end of the same math. The cup-size buttons above do this per-cup arithmetic for whatever you're actually drinking from.

How much coffee for 12 cups?

For a standard 12-cup drip machine (whose cups are 5 fl oz), a balanced 1:17 brew needs about 104 g of coffee — roughly 21 level tablespoons or 10½ scoops — for the 1,776 g of water a full carafe holds. If that sounds like a lot, it's because coffee-maker scoop guidance often assumes a much looser ratio; open the batch table above to see every carafe level from 1 to 12 cups.

How many tablespoons of coffee per cup?

A level tablespoon of ground coffee weighs roughly 5–7 g depending on grind and roast. At balanced ratios that's about 2 level tablespoons per 6 oz cup, or close to 3 per 8 oz mug. Tablespoons measure volume, though, and volume shifts with grind size — a good burr grinder and a 0.1 g scale are what make the same cup happen twice. The calculator shows spoons as a backup, not the plan.

What ratio does espresso use?

Espresso is measured dose-to-yield, not coffee-to-water-in: the modern standard is 1:2 — an 18 g dose pulling a 36 g double shot in about 25–30 seconds. A ristretto runs near 1:1.5 and a lungo near 1:3. Switch the method to Espresso above and the calculator flips to that model automatically; if you're choosing the machine itself, see our best espresso machine reviews.

A ratio is only as good as the measuring behind it. Three things turn "1:17" into a repeatable cup:

  • A scale with 0.1 g resolution — scoops drift with grind and roast; grams don't. The recommended-gear cards under your result point to the scale Clara reaches for.
  • A burr grinder — an even grind extracts evenly. A blade grinder makes dust and boulders that over- and under-extract in the same cup; our burr grinder reviews cover every budget.
  • Beans worth measuring. Fresh, well-roasted whole beans are the difference between a ratio that sings and one that just exists.

Sources & methodology

Ratios are conventions, not physics constants; this tool's presets are kept identical to Brew Gazette's method-specific calculators, and a fixture test asserts every published example on every build. Reviewed by Clara Bennett, CQI Q Grader. About Clara · Last reviewed July 13, 2026.

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Free for coffee blogs, roaster sites, brew-guide pages, and r/Coffee posts. Required attribution is included in the snippet — no fee, no account, no analytics attached to the embed. 

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