[dugditches]

//Although I believe espresso has less caffeine than regular coffee even for equal volumes. //

This is a common confusion. Espresso has more caffeine by volume.

Looking at ~8oz/236ml cup of 'regular' coffee versus ~1oz/29ml shot of espresso.

[lemonberry]

Check your math:

That's 236ml of caffeine for 8oz of coffee and 232ml of caffeine for espresso. That's less caffeine in espresso than coffee by volume.

[dugditches]

My math's fine. I think you misunderstood my post. I was just considering metric and imperial sizes thus included both sets of units.

The first reply to your post shows the math.

Even the 'increased' 240mg in the energy drink is just equivalent to 'regular' coffee due to it being 16oz/473mL can.

As I said though. Much easier to gulp down half a litre of sugary soda than half a litre of oily thick espresso.

[lemonberry]

I did misunderstand it, my apologies.

[maxerickson]

According to Google (which cites USDA) for "espresso caffeine" and "coffee caffeine", there is 64 mg of caffeine in 1 fl oz of espresso and 94 mg of caffeine in 8 fl oz of coffee.

So per unit volume, the espresso has several times the caffeine (and you would already expect a double espresso to have more total caffeine than a modest sized drip coffee).