After coffee is brewed, how long does the caffeine stay, and how long is it good for?

by Corrine


I want to know how long caffeine stays in the coffee once it is brewed. I was told it last only 20min. after it is brewed. Also there was a discuss should or should it not be thrown out after the day it's made. Some say they keep it for a couple of days to avoid waste. Can you please enlighten us.

Thank you for your time.


To answer your first question, caffeine does not evaporate or otherwise disappear after brewing. There will be as much caffeine in your coffee after five hours as there is after five seconds. Arguably, there will be more caffeine, because some of the water will evaporate, increasing the concentration of caffeine in what’s left over.

As for throwing your coffee away at the end of the day, there are two ways to look at this. If it’s the taste that is important to you, then definitely you should throw it away – and after a couple of hours, not at the end of the day.

If you are anxious to save as much money as possible, you can put your leftover coffee in a sealed container, store it in the fridge, and heat it up again the next day. But don’t expect your coffee to taste as good when it is reheated.

Comments for After coffee is brewed, how long does the caffeine stay, and how long is it good for?

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Sep 04, 2016
Good iced coffee
by: Jeffstyles100

In a medium size coffee pot I brew 2 and 1 half of scoops of coffee. I make about 4 pots and then I take a gallon jug and add 8 spoons of sugar per pot of coffee. I then take 16 Oz of sweet creeper and add it all together and stir it up. Leave it in the fridge over night and it's ready in the morning. I drink it for 5 to 7 days and the caffeine effect does not dissipate. You might want to make a new batch on the 8th day because it can get an off taste after that.

Oct 25, 2015
Upper limit
by: Anonymous

No one has a clear account of the breakdown of caffeine i n coffe after brewing. Refrigerated would last longer, but what are the breakdown rate numbers? 0% lost after 50 years? Or slowly 5-10% per week or month? The info is out there somewhere. Starbucks knows!

May 10, 2015
Coffee Oxidizes and loses appeal with air & heat
by: Bill, Coffee Master

Coffee, especially good quality ones, will oxidize from the moment air & water touches the coffee grounds. Continued air ferments and degrades the flavor compounds thereafter so if not consumed immediately, place in the smallest airtight container possible, such as a thermos.

Heat is also damaging to flavors in coffee due to sugars in the extracted grounds. Once brewed, should never be boiled, remove coffee from all heating sources and either serve or place into sealed carafe or thermos {see above}.

Columbian coffee {all I drink}, are relatively higher in sugars, lower in acids to produce the smoothest flavors with least side affects. Columbian beans therefore carry relatively higher price, its flavor & smoothness are worth every penny.

Relatively inexpensive beans from all other growing locations tend to have higher acid levels and need caffeine reconstituted at much higher levels than Columbian to replace caffeine evaporated by dark-roasting the beans sufficiently to caramelize their relatively low sugar content. This is why espresso coffees are so dark but have far less caffeine than any other roasts - caffeine lost to roasting is not reconstituted in finished beans.

Aug 02, 2013
Caffeine after brewing
by: Anonymous

Is there caffeine still left in the grind after brewing coffee? If you brewed the coffee again, can you get some caffeine from the second brew?

Jul 12, 2012
Refrigerated Coffee Is As Good...
by: Anonymous

as fresh brewed. I have experimented with this extensively. If the coffee is immediately removed from the heat and not allowed to burn, and immediately refrigerated, the result is good for days and I find no truly discernible difference between it and fresh brewed.

And if you add cream and sugar, it doesn't matter one iota.

My family loves my coffee and says I make the best they have ever had. And I find the misinformation on the internet disturbing.

One site will say to make coffee in a pot with 12 scoops of coffee, which would make sludge. Another says to use 1/2 cup, which would be a relatively weak brew. It is all to taste.

But as far as caffeine goes, you are absolutely correct. Caffeine does not dissipate despite the number of misguided souls that say it does in their blogs. Where do these people think the caffeine goes? I know, through the wormhole!!

Jun 16, 2012
Cold Coffe, caffeen evaporation
by: Anonymous

Dose it matter if the Coffe is refrigerated, dose the caffeen stay?

Nov 20, 2009
Does caffeine stay in coffee for several days?
by: Anonymous

Does anyone know how long caffeine stays in coffee (without milk)? Does it stay in coffee for several days? Sometimes I decide not to drink coffee that I have made, and I end up drinking it a lot later. I do not mind drinking it cold. I drink it to help me keep awake for an hour or so, if I feel drowsy.

Nov 09, 2009
best answer!!
by: Anonymous

that's completely absurd for someone to tell you that. If that was the case then how would cold coffee that has exploded in all the stores now, keep thier caffiene content after being stored for several days. So don't worry about that , you'll stay "POP LOCKIN" all day long off the same brew if you would like!!!! Really I do it everyday.

Sep 21, 2009
package,what to do with it when the coffee is gone
by: Anonymous

The containers are filling up my garage .Why are you not putting coffee in a air fresh bag instead of a large plastic can use all the old containers for bird houses they will last a life time.

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