At 1:2 that is 36 g of espresso, usually pulled in 25–30 seconds. Change the ratio to 1.5 for a ristretto or 3 for a lungo.
How the coffee ratio calculator works
A ratio of 1:N means 1 gram of coffee for every N grams of water, and 1 ml of water weighs 1 g. CoffeeRatio turns cups into water using the cup size (1 US fl oz = 29.57 ml), then divides the water by N to get the coffee, or multiplies the coffee by N to get the water. Tablespoons assume about 5 g of ground coffee per level tablespoon and 10 g per standard scoop. Brewed yield is the water minus about twice the coffee’s weight, because wet grounds hold roughly double their weight in water; for espresso the water figure is the shot weight itself.
Coffee ratios by brew method
| Method | Ratio | Coffee per 12 oz mug | Coffee per litre |
|---|---|---|---|
| Pour-over / V60 | 1:16 | 22.2 g | 63 g |
| Chemex | 1:15 | 23.7 g | 67 g |
| French press | 1:15 | 23.7 g | 67 g |
| Drip coffee maker | 1:17 | 20.9 g | 59 g |
| AeroPress | 1:12 | 29.6 g | 83 g |
| Cold brew concentrate | 1:5 | 71 g | 200 g |
| Cold brew, ready to drink | 1:8 | 44.4 g | 125 g |
Ratios are starting points. Grind size, roast, water and brew time all change the taste, so adjust one thing at a time: less water for stronger, more for lighter.
Frequently asked questions
What is a ristretto ratio?
About 1:1 to 1:1.5, a shorter, more concentrated shot.
How much coffee for a double shot?
Most double baskets take 16–20 g; 18 g is common.
Why weigh espresso instead of timing it?
Crema makes volume misleading. Weight gives a repeatable shot, and time is used to dial in the grind.
Is CoffeeRatio free?
Yes, with no sign-up or ads, and your settings stay in your browser.
Can I change the ratio?
Yes. Each method starts from a common ratio; type any ratio from 1:1 to 1:30 to make it stronger or weaker.