Daily How Much

A 12-fl-oz can has 34 mg of caffeine, and an 8-fl-oz serving has 23 mg.

A 20-oz bottle of Coke Zero Sugar has about 57 mg of caffeine, since Coca-Cola lists 34 mg per 12 oz and caffeine scales with the pour size.

A 12-oz can of Coke Zero has 34 mg of caffeine, while an 8-oz cup of brewed coffee often lands around 95 mg.

A typical 12-oz (355 mL) serving of Coca-Cola has 34 mg of caffeine, so a 16-oz cup lands near 45 mg if it’s filled with soda.

An 8-oz cup of brewed black tea often lands around 40–70 mg of caffeine, shaped by leaf amount, water heat, and steep time.

An 8-ounce brewed coffee often has 80–100 mg caffeine; brewed black tea often has 40–60 mg, varying with beans, leaves, and brew.

Most Darjeeling cups land in the 30–60 mg caffeine range for 8 oz, with lighter or longer steeps pushing it lower or higher.

A typical 8-ounce matcha drink lands around 38–89 mg of caffeine, with the exact amount driven by powder dose, grade, and how you mix it.

An 8-oz cup of decaf coffee usually has 2–15 mg of caffeine, but brew strength, bean type, and brand can shift the total.

A 16-oz cold brew often lands around 150–260 mg of caffeine, with coffee dose, steep time, and dilution setting the swing.