An 8-oz cup of dark-roast coffee often lands around 70–140 mg of caffeine, with the dose and brew style doing most of the work.

Cold brew concentrate can land anywhere from 50–200 mg of caffeine per small serving, and your dilution changes the strength per sip, not the total dose.

A standard 8-oz cup of green tea lands near 20–45 mg of caffeine, with the final number driven by the tea, the dose, and the steep.

Cold brew can hit 150–300 mg per 16 oz, with concentrate-style batches running higher when you skip dilution.

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.