Clara Bennett, CQI Q Grader, SCA Roaster · Last reviewed June 25, 2026

French Press Coffee Ratio Calculator

Enter how much water you're brewing and get the exact grams of coffee, the ratio, and tablespoons — dialed to the strength you like. Built for the French press, with pour over, drip, AeroPress, and Moka pot modes one tap away. No signup, no ads.

Coffee ratio calculator: pick a brew method and strength, enter your water amount, and see how many grams of coffee to use, the ratio, and tablespoons.

Or pick a common size for French Press:

Enter your water amount and the calculator shows the exact grams of coffee, the brew ratio, and tablespoons.

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. It opens on French Press, but the same engine handles pour over, drip, AeroPress, and Moka pot — each method has its own sensible ratio baked in, because a French press and a V60 are not the same recipe.
  2. Choose a strength. Mild, Balanced, or Strong nudges the ratio looser or tighter. Balanced is the classic French press "golden ratio" of 1:15. Want a number that isn't on the menu? Tap Custom ratio and type your own (1:13, 1:17, whatever your beans like).
  3. Enter your water. Type the amount in grams, milliliters, or fluid ounces — switch units and the value converts so your recipe stays the same. Don't know the number off-hand? Tap a common size chip (a 1 L press, a 700 mL Chemex, a 6-cup Moka) and it fills in for you.
  4. Read your recipe. The card shows grams of coffee (weigh this), the exact ratio, tablespoons and scoops as a backup, plus a grind and steep tip for the method. It recalculates the instant you change anything — there's no "calculate" button.
  5. Save it. Copy the recipe as text, share a link that reopens the calculator with your exact settings, or download a branded brew card PDF to tape inside the cabinet.

Why this coffee ratio calculator is different

Search "french press coffee ratio" and you'll get a dozen blog posts that each state a single number — and they don't agree. Blue Bottle brews close to 1:12, Starbucks says 1:18, Illy says 1:20, the SCA's golden cup lands near 1:18, and James Hoffmann pours roughly 1:14 into a press. They're all right, for the cup they're after. Here's what this tool does that a static guide can't:

  • It's one engine for every method, not just the French press. The one ranking calculator out there does French press only. This one switches between five brew methods, each with method-appropriate ratios, so you're not forcing a drip number onto a Moka pot.
  • It turns the ratio into your numbers. A guide tells you "1:15." This tells you "33 grams of coffee for your 500 grams of water," for whatever batch size you actually own. That's the math people get wrong by hand.
  • It respects strength as a dial, not a doctrine. Mild/Balanced/Strong moves the ratio inside the sane range for each method, and the custom field lets a picky brewer pin an exact ratio.
  • It shows its work. The ratios come from published standards (linked below), and a fixture test runs every build so the math on the page can't quietly drift.
  • It's shareable and embeddable. Copy a link, export a PDF, or drop the whole calculator into your own coffee blog with the embed snippet at the bottom — attribution included, free.

How it works (the math behind the cup)

A coffee "ratio" is just grams of coffee to grams of water, written 1:X. Because water weighs almost exactly 1 gram per milliliter, the whole thing is one division: 

water_grams  = water_volume x density   (1 mL water = 1 g; 1 fl oz = 29.57 g)
coffee_grams = water_grams / ratio       (ratio = the X in 1:X)
tablespoons  = coffee_grams / 5          (1 level tbsp of grounds is about 5 g)

The part the internet fights about is which ratio. This calculator anchors each method to widely-cited standards: the French press "golden ratio" of 1:15 (Espro, Dancing Goats, and the middle of the SCA range) for Balanced, around 1:13 for Strong (Hoffmann/Blue Bottle territory) and 1:17 for Mild. Pour over and drip sit a touch lighter; Moka pot runs much tighter at roughly 1:10 because it's a concentrated, espresso-adjacent brew. The grams are weight, not volume, on purpose — a tablespoon of light-roast beans and a tablespoon of oily dark roast are different masses, which is exactly why baristas weigh. The tablespoon and scoop figures here are a convenience for when you don't have a scale yet.

Three recipes from the calculator

One mug, French press, balanced

A single big mug is about 350 mL of water. At the balanced 1:15 French press ratio the calculator returns 23 g of coffee (≈ 4.5 tbsp). Grind it coarse like sea salt, steep four minutes, break the crust, and plunge slow. That's a clean, classic press cup.

A full 1 L press for two, strong

Fill a 1 L (34 oz) press and set strength to Strong (1:13) and you'll get about 77 g of coffee. That's a bold, full-bodied pot meant to stand up to milk. If it's too punchy, bump back to Balanced and you drop to ~67 g — the calculator shows the difference instantly so you can dial it without dumping a brew.

A Chemex pour over for guests

Switch the method to Pour Over, pick the 700 mL Chemex chip, leave it Balanced (1:16), and you get 44 g of coffee. Medium-fine grind, bloom with about twice the coffee weight in water for 30–45 seconds, then pour in stages. Same engine, totally different recipe — that's the point of method-aware ratios.

Frequently asked questions

What is the best coffee-to-water ratio for a French press?

The most-cited "golden ratio" for a French press is 1:15 — one gram of coffee for every fifteen grams (or millilitres) of water — which is what this calculator uses for Balanced. If you like a bigger, bolder cup, tighten toward 1:13; for a lighter, tea-like brew, loosen toward 1:17. There's no single correct number, only the one that tastes right to you, which is why the strength dial and custom ratio exist.

How much coffee do I put in a French press?

Weigh your water, then divide by your ratio. For a common 1 L (34 oz) press filled to about 1,000 g of water at 1:15, that's roughly 67 g of coffee — around 13 level tablespoons. For a smaller 350 mL serving it's about 23 g. Enter your exact water amount above and the calculator does the division for you.

How many tablespoons of coffee per cup?

A level tablespoon of ground coffee weighs roughly 5–7 grams depending on grind and roast, so a "cup" (6 fl oz / 180 mL) at a 1:16 ratio is about 11 g, or close to 2 tablespoons. The calculator shows tablespoons as a backup, but a kitchen scale is far more consistent — tablespoon volume varies with how finely the coffee is ground.

Is the ratio the same for pour over, drip, and Moka pot?

No — and that's a common mistake. Pour over and drip sit around 1:16–1:18, while a Moka pot runs much tighter near 1:10 because it makes a small, concentrated brew. Switch methods at the top of the calculator and the ratio adjusts automatically. Espresso and cold brew use different math entirely (dose-to-yield and concentrate dilution), so they get their own tools rather than a misleading mode here.

Should I measure coffee by weight or by scoops?

Weight, every time, if you can. A scoop or tablespoon measures volume, and volume changes with grind size, roast, and how the grounds settle. Weighing on a 0.1 g scale is how you get the same cup twice. The scoop and tablespoon outputs here are for getting close before your scale arrives.

A ratio is only as good as the gear you measure and brew with. Three things turn "1:15" into a repeatable cup:

  • A burr grinder for an even, coarse grind — a blade grinder makes dust and boulders at once, which over- and under-extracts in the same cup. The calculator's recommended-gear cards (they appear under your result) point to the burr grinder Clara reaches for.
  • A scale with a timer so you can weigh the dose and the water and actually hit the ratio above — guessing with scoops undoes the whole exercise.
  • The right brewer for your batch. If you're consistently brewing a full carafe, a bigger press saves you a second round. Pulling shots instead? See our best espresso machine reviews — and if iced is your summer move, the cold brew guide walks through that ratio start to finish.

Sources & methodology

Ratios are conventions, not physics constants — reviewed by Clara Bennett, CQI Q Grader. About Clara · Last reviewed June 25, 2026.

Embed this calculator on your site

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

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  Coffee ratio calculator by
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  &middot; Reviewed by Clara Bennett, CQI Q Grader
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