How long does Pre-Workout
stay in your system?
Pre-workout caffeine content varies widely by brand — typically 150 to 400 mg per serving, with no single typical amount. Enter the caffeine amount from your own label below.
Based on Caffeine half-life · 5h
Pre-workout formulas vary widely. Enter the caffeine amount shown on the label for the serving you actually used — not the number of scoops. If your serving uses more than one scoop, add up the caffeine for all of them before entering it.
Related products
Pre-workout caffeine content varies enormously between brands and even between flavors of the same product, ranging from under 150 mg to over 400 mg per serving. It is also frequently stacked with other stimulants and ingredients, so the label is the only reliable source — check it before you calculate, and do not assume one scoop equals one coffee.
Because the amount varies so much by brand, there is no single decay number that applies to every pre-workout — enter the caffeine amount from your own label above to see your own curve. As a rule of thumb, caffeine's roughly 5-hour half-life means whatever amount you took is roughly halved every five hours, which is why a stimulant pre-workout taken late in the afternoon before training can still leave a residual amount at bedtime.