How Much Caffeine Is in Cold Brew? Homemade, Concentrate and Café Drinks

A typical 8 oz glass of homemade cold brew has somewhere around 150–280 mg of caffeine. The exact amount depends almost entirely on how much coffee you used, not on the cold water. Café cold brew is often lower per ounce because it's diluted and poured over ice: Starbucks, for example, lists about 205 mg for a 16 oz grande. Undiluted cold brew concentrate is the strong one, with roughly 180–340 mg in just 4 oz.

For comparison, an 8 oz cup of hot brewed coffee averages about 96 mg (Mayo Clinic). The FDA says up to 400 mg a day is generally not associated with negative effects for most healthy adults.

Cold brew caffeine at a glance

Homemade figures are estimates. We work them out the same way as our caffeine calculator: the grams of coffee in the drink multiplied by typical arabica caffeine content (about 1–1.4% of the bean's weight), assuming most of it ends up in your glass. Real numbers vary with the beans, the roast and your recipe, so treat the ranges as ballpark figures, not lab measurements.

Why cold brew can be so strong

Cold water extracts coffee more slowly than hot water, so cold brew makers compensate with more coffee and more time:

• More coffee per cup of water. Hot drip coffee usually runs around 1:15 to 1:17. Cold brew is often made at 1:4 to 1:8 for concentrate or 1:12 for ready-to-drink. That's up to three or four times more coffee per ounce of water before dilution.
• Long steeps pull out the caffeine anyway. Caffeine dissolves easily. In a 2017 study in Scientific Reports, caffeine in cold brew reached equilibrium within about 6–7 hours, well inside the usual 12–24 hour steep. The same study found cold brew's caffeine was comparable to hot brew made with the same coffee, and higher in some coarse-grind samples.

So "cold brew has more caffeine" is true of most recipes, but it's a choice of ratio, not a property of cold water. Brew it weaker or dilute it more, and it can have less caffeine than your morning hot coffee.

How to estimate your own glass

1. Work out the grams of coffee per glass. If you made concentrate with 200 g of coffee and 1 liter of water (1:5), every 100 ml of concentrate comes from about 20 g of coffee.
2. Multiply by 10–14 mg per gram for arabica beans (more for robusta blends).
3. Adjust for dilution: adding water, milk or ice doesn't change the caffeine in the glass, only how strong each sip is.

Or skip the math: enter your grams of coffee in the caffeine calculator. To find the grams for any jar size, use the coffee ratio calculator in cold brew mode.

How to make cold brew with less caffeine

• Brew ready-to-drink instead of concentrate: 1:12 to 1:15 instead of 1:5.
• Dilute concentrate more: 1:2 or 1:3 with water or milk instead of 1:1.
• Pour a smaller glass, or more ice.
• Mix in decaf beans: half decaf cuts the caffeine roughly in half.
• Choose 100% arabica. Robusta has about twice the caffeine; blends with robusta add a lot.

Bottom line

Cold brew isn't inherently a caffeine bomb. It depends on how much coffee went into it. Homemade ready-to-drink cold brew and café cold brew usually land between one and two cups of hot coffee per glass, while undiluted concentrate is far stronger. Know your ratio, and you know your caffeine.

For the recipes behind these numbers, see the cold brew coffee ratio guide, or compare methods in cold brew vs. iced coffee. Want the gear? Our best cold brew coffee makers and grinders for cold brew guides cover it.