As a consumer of coffee from several different sources (made at home, from a coffee shop, out of a fancy designer can at a convenience store), I have often wondered about their relative caffeine content; "Does three of these equal two of those?"

To that end I'd like to ask if there are any ways that coffee consumers can measure caffeine content of what they are drinking.

I'm not asking if there are tables out there or ways to look some of them up or estimate the caffeine content of these coffees, I'd like to know if there's any way that a particularly nerdy consumer can measure it themselves, even if it requires a bit of an investment.

I asked this in Chemistry SE many years ago to no avail:

• Home science optical absorption test for approximate caffeine quantity in coffee?

Answers here in Cooking SE don't quite make it:

• How can you measure the caffeine content of a liquid at home?

As a consumer of coffee from several different sources (made at home, from a coffee shop, out of a fancy designer can at a convenience store), I have often wondered about their relative caffeine content; "Does three of these equal two of those?"

To that end I'd like to ask if there are any ways that coffee consumers can measure caffeine content of what they are drinking.

I'm not asking if there are tables out there or ways to look some of them up or estimate the caffeine content of these coffees, I'd like to know if there's any way that a particularly nerdy consumer can measure it themselves, even if it requires a bit of an investment.

I asked this in Chemistry SE many years ago to no avail:

• Home science optical absorption test for approximate caffeine quantity in coffee?

Answers here in Cooking SE don't quite make it:

• How can you measure the caffeine content of a liquid at home?

update: Chemistry SE's What is the standard industrial method for measuring caffeine content in food and drinks? has now been nicely answered; just buy a briefcase-sized HPLC system with a C18 reversed phase column and a UV detector :-)

As a consumer of coffee from several different sources (made at home, from a coffee shop, out of a fancy designer can at a convenience store) I have often wondered about their relative caffein content; "Does three of these equal two of those?"

To that end I'd like to ask if there are any ways that coffee consumers can measure caffein content of what they are drinking.

I'm not asking if there are tables out there or ways to look some of them up or estimate the caffein content of these coffees, I'd like to know if there's any way that a particularly nerdy consumer can measure it themselves, even if it requires a bit of an investment.

I asked this in Chemistry SE many years ago in Chemistry SE to no avail:

• Home science optical absorption test for approximate caffeine quantity in coffee?

Answers here in Cooking SE don't quite make it:

• How can you measure the caffeine content of a liquid at home?

As a consumer of coffee from several different sources (made at home, from a coffee shop, out of a fancy designer can at a convenience store), I have often wondered about their relative caffeine content; "Does three of these equal two of those?"

To that end I'd like to ask if there are any ways that coffee consumers can measure caffeine content of what they are drinking.

I'm not asking if there are tables out there or ways to look some of them up or estimate the caffeine content of these coffees, I'd like to know if there's any way that a particularly nerdy consumer can measure it themselves, even if it requires a bit of an investment.

I asked this in Chemistry SE many years ago to no avail:

• Home science optical absorption test for approximate caffeine quantity in coffee?

Answers here in Cooking SE don't quite make it:

• How can you measure the caffeine content of a liquid at home?

As a consumer of coffee from several different sources (made at home, from a coffee shop, out of a fancy designer can at a convenience store) I have often wondered about their relative caffein content; does three of one equal two of the other from a caffein "dosage" standpoint?

To that end I'd like to ask if there are any ways that coffee consumers can measure caffein content of what they are drinking.

I'm not asking if there are tables out there or ways to look some of them up or estimate the caffein content of these coffees, I'd like to know if there's any way that a particularly nerdy consumer can measure it themselves, even if it requires a bit of an investment.

I asked this in Chemistry SE many years ago in Chemistry SE to no avail:

• Home science optical absorption test for approximate caffeine quantity in coffee?

Answers here in Cooking SE don't quite make it:

• How can you measure the caffeine content of a liquid at home?

As a consumer of coffee from several different sources (made at home, from a coffee shop, out of a fancy designer can at a convenience store) I have often wondered about their relative caffein content; "Does three of these equal two of those?"

To that end I'd like to ask if there are any ways that coffee consumers can measure caffein content of what they are drinking.

I'm not asking if there are tables out there or ways to look some of them up or estimate the caffein content of these coffees, I'd like to know if there's any way that a particularly nerdy consumer can measure it themselves, even if it requires a bit of an investment.

I asked this in Chemistry SE many years ago in Chemistry SE to no avail:

• Home science optical absorption test for approximate caffeine quantity in coffee?

Answers here in Cooking SE don't quite make it:

• How can you measure the caffeine content of a liquid at home?