This coffee ratio calculator dials in your brew: choose a strength ratio and either your water or your dose, and get the other — in grams, milliliters and tablespoons.
The Golden Ratio and Its Neighbors
Brewing is a ratio game: 1 part coffee to N parts water, by weight. The Specialty Coffee Association’s famous “Golden Cup” standard centers on about 1:18 (55 g per liter) with most specialty cafés brewing richer, 1:15–1:17. Water weighs 1 g per ml, so grams and milliliters of water are interchangeable on the scale — one less conversion to muff before caffeine. Part of our Food Calculators collection.
Worked Example (Verified)
- 500 ml water at 1:16 → coffee = 500 ÷ 16 = 31.3 g (about 4.5 tablespoons)
- 30 g of coffee at 1:16 → water = 30 × 16 = 480 ml — two mugs, dialled
- Espresso plays a different sport entirely (~1:2), and cold brew concentrate brews at 1:8–1:12 before dilution — the ratio idea travels, the numbers adapt.
Method Cheat Sheet
| Method | Typical ratio | Per 500 ml water |
|---|---|---|
| French press | 1:12 – 1:14 | 36–42 g |
| Pour over (V60) | 1:15 – 1:17 | 29–33 g |
| Auto drip | 1:16 – 1:18 | 28–31 g |
| Cold brew (ready to drink) | 1:14 – 1:16 | 31–36 g (steeped) |
| Moka pot | ~1:10 | ~50 g (basket decides) |
Getting the Most From the Numbers
- Weigh, don’t scoop: a “tablespoon” of grounds varies 5–10 g by grind and roast — the scale (±1 g) is why ratios exist. The tbsp output above assumes ~7 g per level tablespoon and is labeled approximate for a reason.
- Ratio sets strength; grind and time set extraction. Sour/thin usually means under-extracted (grind finer) — not under-dosed. Fixing the wrong variable is the classic home-brewer spiral.
- Change one variable at a time, in small steps (one ratio notch), and take a note. Your palate’s optimum within 1:14–1:18 is personal and real.
Related Tools
- Food Calculators — the full collection
- Cups to Grams Converter — for everything after coffee
Frequently Asked Questions
What is the best coffee to water ratio?
1:16 is the standard starting point (the “golden ratio”): 31 g of coffee per 500 ml water. Go 1:14–1:15 for stronger, 1:17–1:18 for milder — taste arbitrates from there.
How much coffee for 500 ml of water?
At 1:16, 31.3 g (roughly 4.5 level tablespoons). At a strong 1:14, 35.7 g; at a mild 1:18, 27.8 g.
How many grams of coffee in a tablespoon?
About 7 g for a level tablespoon of ground coffee — but it swings with grind size and roast, which is why every serious ratio guide works in grams on a scale.
Does the ratio change for French press or cold brew?
Yes — immersion methods usually go stronger: French press commonly 1:12–1:14, cold brew concentrate 1:8–1:12 (diluted to taste afterward). Percolation (pour over, drip) lives at 1:15–1:18.
What ratio is espresso?
Around 1:2 (e.g. 18 g in, 36 g of liquid espresso out) — a completely different beverage category sharing the same ratio language.
Is this coffee ratio calculator free?
Yes — free, instant, no sign-up.