4 ms·

True, but very little.

• jeffwass 9y ago
  But you're also putting faith in the person who prepared it that it truly is decaf. I've been burned by getting regular coffees at restaurants and coffee machines when I ordered decaf. I wonder how hard it would be to have a "litmus paper" style test for caffeine.
• 0xbear 9y ago
  About 15-20% of full strength. Hardly negligible.
  • deleted 9y ago
    [deleted]
  • mcbits 9y ago
    More like 5%, but it's high enough that if you measure your coffee intake in pots/day then there is still enough caffeine for physical effects and dependence.