Espresso forces hot water through fine grounds under pressure in 20–30 seconds, pour-over drips hot water through a filter over 2–4 minutes, French press steeps coarse grounds for about 4 minutes before pressing, and cold brew steeps coarse grounds in cool water for roughly 12 hours. The National Coffee Association (NCA) sets a grind, ratio and time for each method, and the U.S. Food and Drug Administration (FDA) publishes the caffeine ranges that result.
Four brewing methods dominate home and café coffee: espresso, pour-over, French press and cold brew. Each uses a different grind size, water temperature and contact time, which is why the same beans can taste very different depending on how they are brewed. The specifications below come from the National Coffee Association's (NCA) brewing guides, published on its consumer site aboutcoffee.org.
Espresso: high pressure, short time
Espresso uses a fine grind, described by the NCA as similar to table salt, because the brew is finished in only 20 to 30 seconds. Water is forced through a compact puck of tamped coffee under high pressure. The NCA's recommended ratio is 1 gram of dry coffee to 2 grams of brewed espresso (1:2), with 20–30 seconds of contact between coffee and water. Unlike its guides for pour-over and French press, the NCA's espresso guide does not specify a brewing water temperature.
Pour-over: manual control over extraction
Pour-over calls for a medium grind, similar to kosher salt, and water heated to 93°C ± 3°C (about 200°F), per the NCA. The coffee-to-water ratio runs 1:13 to 1:16. After rinsing the paper filter, the grounds are first "bloomed" with roughly double their weight in water for 30–45 seconds, then the rest of the water is poured slowly from the center outward, for a total contact time of 2 to 4 minutes.
French press: full immersion
French press requires a coarse grind, like rock salt, steeped in water at the same 93°C ± 3°C range used for pour-over, according to the NCA. The ratio is 1:10 to 1:16. Grounds steep for about 1 minute before being stirred to break up the surface crust, then steep for roughly 3 more minutes with the plunger lid on before being pressed down. The NCA advises pouring the coffee into a separate container immediately if it will not be drunk right away, since grounds left in contact with the brew keep extracting and can turn it bitter.
Cold brew: time instead of heat
Cold brew also uses a coarse grind but skips heat entirely, steeping coffee in room-temperature or cooler water for about 12 hours, the NCA says, with a stronger coffee-to-water ratio of 1:4 to 1:5 (compared with ratios up to about 1:16 for hot brewing methods like pour-over and French press). This produces a concentrate that many drinkers dilute with water, milk or ice. The NCA distinguishes cold brew from iced coffee, which is simply hot-brewed coffee cooled or poured over ice rather than steeped cold from the start.
NCA brewing specifications by method
Method
Grind size
Ratio (coffee:water)
Temperature
Contact time
Espresso
Fine (table salt)
1:2 (dry coffee to brewed espresso)
Not specified by NCA
20–30 seconds
Pour-over
Medium (kosher salt)
1:13–1:16
93°C ± 3°C (~200°F)
2–4 minutes
French press
Coarse (rock salt)
1:10–1:16
93°C ± 3°C (~200°F)
~4 minutes total
Cold brew
Coarse (rock salt)
1:4–1:5
Room temperature or cooler
~12 hours
How much caffeine ends up in the cup
Brewing method affects strength more than caffeine amount per serving in isolation, since serving sizes and dilution vary. The U.S. Food and Drug Administration (FDA) states that a standard 12-fluid-ounce serving of regular brewed, non-specialty coffee typically contains 113 to 247 milligrams of caffeine. The FDA cites 400 milligrams a day — about two to three 12-fluid-ounce cups of coffee — as the amount generally not associated with negative effects for most healthy adults, while noting that individual sensitivity to caffeine varies with body weight, medications and medical conditions.
Match the grind to the method first: fine for espresso, medium for pour-over, coarse for French press and cold brew.
Use water in the 93°C ± 3°C (about 200°F) range for pour-over and French press; cold brew skips heat and relies on long steeping instead, and the NCA does not specify a water temperature for espresso.
Weigh coffee and water rather than eyeballing — the NCA's ratios range from a concentrated 1:2 for espresso to about 1:16 for diluted drip-style brewing.
Respect contact time: pulling espresso too long, steeping French press too long, or leaving grounds in a press pot will over-extract and taste bitter, per NCA guidance.
For cold brew, plan ahead — the NCA's typical steep is about 12 hours, so it is usually started the night before.
Coffee will continue to brew and turn bitter.
— National Coffee Association, aboutcoffee.org (French press guide)
Questions
Which brewing method has the most caffeine per cup?
Per fluid ounce, espresso is the most concentrated. But because serving sizes differ, a full 12-ounce serving of regular brewed coffee can contain more total caffeine (113–247 mg, per the FDA) than a single espresso shot.
What grind size should I use for each method?
The NCA recommends fine grind (like table salt) for espresso, medium grind (like kosher salt) for pour-over, and coarse grind (like rock salt) for both French press and cold brew.
Is cold brew the same as iced coffee?
No. According to the NCA, cold brew is steeped in cold or room-temperature water for hours, while iced coffee is brewed hot using a normal method and then cooled or poured over ice.
What water temperature is correct for pour-over and French press?
The NCA specifies 93°C ± 3°C, roughly 200°F, for both methods — just off a full boil. The NCA's espresso guide does not give a specific water temperature.
How much caffeine is considered safe per day?
The FDA cites 400 milligrams a day, roughly two to three 12-fluid-ounce cups of coffee, as the amount generally not associated with negative effects in most healthy adults, while noting individual sensitivity varies.
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