What is the golden ratio for coffee?

The Specialty Coffee Association suggests roughly 1:18 — about 55 g of coffee per litre of water. In practice most filter methods sit between 1:15 and 1:18, with French press going as strong as 1:12. The strength slider in this calculator picks a value inside the safe range for whichever method you choose.

How much coffee for 12 cups?

It depends on what counts as a cup. A drip-machine 'cup' is 5 fl oz (148 mL), so 12 of them = 1,776 mL of water. At a 1:16 ratio that's about 111 g of coffee — roughly 21 level tablespoons or 10 standard scoops. If you mean 12 mugs at 240 mL each, set the cup size above and the calculator will work it out for you.

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

A French press lives between 1:12 (very strong, full-bodied) and 1:17 (mild and clean). 1:15 is a great starting point: it produces a full cup without being overpowering. Use a coarse grind, 4 minutes of steep time, and water at 95 °C / 203 °F.

What ratio should I use for pour over?

Most pour over recipes use 1:15–1:18. James Hoffmann's classic V60 recipe uses 1:16 (e.g. 30 g coffee to 500 g water). Adjust within that range to taste — slide toward 1:15 for stronger, 1:18 for milder.

How is cold brew different — is the ratio really 1:4?

Cold brew is brewed as a concentrate, then diluted before drinking. Common concentrate ratios are 1:4 to 1:8. The calculator shows you both: the concentrate amount you brew, and the drinkable cups you'll get after a 1:1 dilution with water, milk, or ice.

How many tablespoons of coffee equal a scoop?

A standard 'coffee scoop' is 2 level tablespoons, which is about 10–11 g of medium-ground coffee. Tablespoon conversions vary with roast and grind, which is why we show grams alongside scoops/tablespoons in every result.

How much caffeine is in a cup of coffee?

A typical 240 mL (8 fl oz) drip or pour-over cup has 80–120 mg of caffeine. French press tends to be slightly higher (~120–150 mg), espresso is ~60–75 mg per shot, and cold brew is the most variable. The calculator estimates caffeine from your method and dose, but actual content depends on bean variety, roast, and extraction.

Can I use this calculator for espresso?

Yes — pick the Espresso method. Espresso ratios are described as 'brew ratio': dose : yield. Classic espresso is 1:2 (e.g. 18 g in, 36 g out), ristretto is 1:1.5, and lungo is 1:3. Note that for espresso, 'water' here means the weight of liquid in your cup, not water poured through.

Why do drip coffee makers use 5 oz cups?

It's a hold-over from older convention. Most coffee makers calibrate '12 cups' as 60 fl oz (1,776 mL), not 96 fl oz. If your mug is 8 fl oz, your machine's '12 cups' is really 7.5 of your mugs. Set the cup-size input above to your real mug to get accurate brew amounts.

Should I weigh coffee in grams or use tablespoons?

Grams give you repeatable results — a tablespoon of light roast weighs less than dark roast, and densely packed grounds weigh more than fluffy ones. If you don't have a scale, our tablespoon and scoop outputs are calibrated against 5.3 g per level tablespoon, which is a reasonable middle estimate.

Coffee Calculator

Brew Method

Clean, balanced cup. V60 / Kalita Wave / Hario.

Ratio range

1:15–1:18

Grind

Medium

Time

3–4 min

Solve for

Water Amount

g / mL

Cup Size240 mL

Strength — Strong1:16.5

1:181:15

Coffee Cost (optional)per kg

/kg

Enter cost in your local currency — the cost-per-cup output uses the same currency.

Pour Over — 1:16.5

Coffee

30.3

grams

Water

500

grams / mL

Coffee 1 partWater 16.5 parts

Alternate Measures

For when a kitchen scale isn't handy

Tablespoons

5.7

of ground coffee

Scoops

2.9

2-tbsp scoops

Cups

2.1

at 240 mL

US Cups Water

2.11

8 fl-oz cups

Caffeine & Cost

Estimates — actual extraction varies with grind, time, and bean origin.

Caffeine / Cup

~117 mg

at 240 mL cup

Total Caffeine

~242 mg

across the whole brew

Cost / Cup

— add price

enter beans cost above

Pour Over Brew Notes

Recommended grind, contact time, and water temperature for pour over

Grind

Medium

size of grounds

Brew Time

3–4 min

contact / steep time

Water Temp

93–96°C

200–205°F

What Is a Coffee Calculator?

Get the right coffee-to-water ratio for every brew method

1:15–1:18

Golden Ratio

Pour over, drip, Chemex

1:12–1:17

French Press

Full body, immersion

1:1.5–1:3

Espresso

Pressurized shot

A coffee calculator turns a recipe ratio into exact grams of beans and water (or ounces, tablespoons, scoops, and cups). Tell it how much water you have — or how many cups you want — and it works out the rest at the right strength for your brew method.

Whether you searched for a coffee to water ratio calculator, a french press coffee calculator, a pour over coffee calculator or a cold brew calculator, this tool covers all eight major methods in one place — with grind size, brew time, caffeine estimate, and cost-per-cup built in.

How the Coffee-to-Water Ratio Is Calculated

The formulas behind every output

Coffee & Water

Coffee (g) = Water (g) ÷ Ratio
Water (g) = Coffee (g) × Ratio
1 mL of water ≈ 1 g

The ratio is the “N” in 1:N

Alternate Measures

1 tbsp ground coffee ≈ 5.3 g
1 scoop = 2 tbsp ≈ 10.6 g
1 oz = 28.35 g, 1 fl oz = 29.57 mL

Volume measures vary with grind — weigh when you can

Worked Example: Pour Over at 1:16, 500 mL water

Water

500

grams / mL

Ratio

1:16

coffee:water

Coffee

31.3

grams

Tablespoons

5.9

of grounds

500 g ÷ 16 = 31.25 g of coffee. That's about 5.9 level tablespoons or 3 standard scoops of medium-ground coffee.

Coffee Ratio by Brew Method

Recommended grind, time, and ratio range per method

Method	Ratio	Grind	Time
Pour Over (V60, Kalita)	1:15 – 1:18	Medium	3–4 min
Drip Coffee Maker	1:15 – 1:18	Medium	auto
Chemex	1:15 – 1:17	Medium–Coarse	4–5 min
French Press	1:12 – 1:17	Coarse	4 min steep
AeroPress	1:10 – 1:17	Fine–Medium	1–2 min
Moka Pot	1:7 – 1:10	Fine	4–5 min
Cold Brew (concentrate)	1:4 – 1:8	Coarse	12–24 hr
Espresso	1:1.5 – 1:3	Very Fine	25–30 sec

The “golden ratio” — popularized by the Specialty Coffee Association — is roughly 1:18 (about 55 g of coffee per litre of water). Most filter-style brewers cluster between 1:15 and 1:18.

What Else Affects Your Cup

The ratio is the start — these dial it in

Water Temperature

Aim for 93–96 °C (200–205 °F) for hot methods. Boiling water scorches grounds and over-extracts bitter compounds; cooler water under-extracts and tastes sour.

Grind Size

Finer grind = faster extraction. If your brew tastes bitter, go coarser. If it tastes weak or sour, go finer. The grind in this calculator is a starting point.

Caffeine numbers are estimates

Caffeine content depends on bean origin, roast level, grind, brew time, and extraction yield. The mg-per-cup figure here is a typical mid-range estimate for the method you selected — treat it as a guide, not a clinical dose.

Common Mistakes (and Quick Fixes)

Tighten your brew without buying new gear

Measuring Coffee by Volume

A tablespoon of light-roast beans weighs less than dark roast. A scale solves this — even a $10 one is a step change for consistency.

Using a Drip-Maker “Cup” (5 oz)

Most coffee makers count a cup as 5 fl oz, not the 8 fl oz you actually drink. Set the cup-size input above to match your real mug.

Same Ratio for Every Method

A 1:16 ratio is great for pour over but watery for French press and useless for espresso. Pick the method first — the ratio range follows.

Boiling Water Off the Kettle

Let the kettle sit for 30 seconds after the boil, or set it to 95°C. Anything above 96°C aggressively over-extracts and tastes burnt.

Frequently Asked Questions

Common questions about coffee-to-water ratios, brew methods, and measurements

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Last updated Apr 30, 2026