Do you Weigh Coffee Before or After Grinding?

When it comes to making your coffee at home, you seem to start accumulating equipment once you get into it. You start out buying ground coffee from the supermarket and a french press. Before you know it, you’ve got an expensive hobby, wanting different brewers, a timer, some scales, and probably even a decent coffee grinder. 

But, here’s the question. Which do you weigh; your coffee beans or your coffee grounds? You’re weighing your coffee (and presumably water) because you have a brew recipe (another big tick). But what came first was the chicken or the egg, or in this case – the weighing or the grinding.

Do you weigh coffee before or after grinding? If you’re doing things correctly, both. You need to weigh the coffee before grinding it, so you’re only using the amount you need. Once it’s ground, you should then recheck the weight, as some grinders retain a bit of coffee, or worse, there was a bit of old coffee left in your grinder, and you have too much. 

This post will be for those who want to get their coffee just right. When paying attention to the small details, you’re rewarded with an even more delicious cup of coffee.

Why do you Weigh Coffee?

Like you would weigh your flour when baking a cake, you should weigh your coffee with a coffee scale. If you have a recipe, you can replicate it and get the same results each time you make it.

So, the first time you make a coffee in your favorite mug you know you use 15g of coffee. If it was too weak, too strong, or just perfect, you know whether to use less, more, or the same amount next time.

Also, the closer you grind your coffee to using it, the better. As soon as coffee is ground and exposed to air, light, and moisture, it will start to degrade quickly. So if you can grind precisely the amount you need, you can eliminate any waste of coffee.

Should I Weigh my Water too?

Absolutely, you should weigh your water. There are only two ingredients in coffee brewing (I’ve not forgotten milk, but that comes later). Coffee and water. The same principle applies to water. The coffee I brewed on my pour over this morning had a recipe of 16g of coffee to 240g of water. 

Do I Weigh the Water Before I Pour it on the Coffee or During?

You can do either or both. If you’re pouring straight from the kettle you boiled the water in, then it’s easiest to weigh as you brew. Also, you will probably not pour all the water in one go. You will want to pour a particular volume each time, so you’ll have your brewer on the scales anyway.

However, if you’re pouring from a different kettle to the one you boiled your water in, or you’re just terrible at stopping at the right amount, weighing out the correct volume of water before you start is fine.

Weighing Coffee and Water Using Math = Smart Coffee Drinkers

Maybe your saying to yourself “Why do I need to use math when making coffee when I can just taste to see if it’s good?” The truth is I didn’t like the idea of having to do some math when making a coffee, especially ratios. Once I took a little time to understand it, it made coffee making much tastier, quicker, and easier.

To explain more let us take my filter coffee this morning as an example: 16g coffee to 240g water. Now for the ratio bit. For each gram of coffee that I use, I require 15g of water. That’s a ratio of 1:15.

So if I wanted 1.5 cups of coffee, I would need 24g of coffee (16 + (16/2) = 24g). Then, multiply 24 by 15 to get how much water I would need (360g).

Table showing how to do the math with a coffee water ratio of 1:15. So if I wanted 1.5 cups of coffee, I would need 24g of coffee (16 + (16/2) = 24g). Then, multiply 24 by 15 to get how much water I would need (360g).

Now, let’s say you have a coffee mug that holds 350g of water. You can also work the ratio problem backwards to see how much coffee grounds you would need. For 350g of water, you divide it by 15, to get 23.3g of coffee. You will need 23.3 grams of coffee for you 350 grams of water.

Table showing how to do the math for a coffee water ratio of 1:15. If you have 350 grams of water, how much coffee would you need? Doing the ratio of 1 over 15, simply divide 350 by 15 and you get 23.3 grams of coffee.

The best part about this is when you find you have only 13g of coffee at the end of the bag, you now have the skills to make a mini coffee (195g), which is much better than a full cup of substandard coffee.

For more information on what is the best coffee to water ratio, check out our other article here!

It’s important to note that when making espressos, the same principles apply as with filter coffee.

Grinding and Weighing Coffee in a Café…

As a general rule of thumb, the more coffee weighing you see in a café, the better your coffee will be. I would expect to see the weighing and grinding principles I have already mentioned with filter coffee. With espressos, I would expect to see a similar process.

Most good cafes now have on-demand grinders which accurately release a programmable dose of ground coffee in a matter of seconds. The barista will then check the weight of this dose, and often add or remove some of the ground, so it’s within +/- 0.2g of their recipe amount.

They will also weigh the espresso as it comes from the espresso machine (some espresso machines now have inbuilt scales for this) to check that it’s also the volume they’re looking for. My starting ratio for espresso is a 1:2 ratio, so for example, 18g of ground coffee to 36g of espresso.

Does all Coffee Weigh the Same?

Excellent question. No, and here are some reasons why. Green coffee beans (the seed from inside a coffee cherry) are just like apples or carrots – no two beans are identical in shape or size. Beans also lose moisture when they’re roasted. So roast time and roast temperature can have a significant effect.

However, all coffee beans (and ground) are sold by weight, so a 250g bag of coffee always weighs 250g. This all feels a bit complicated, but in truth, I’ve never looked in a 250g bag of coffee and noticed a considerable variation in volume, so it’s good to know, but nothing to worry about.

Final Thoughts

Hopefully, you aren’t completely confused about water and coffee ratios after reading this article. It really isn’t that difficult once you’ve done it a couple times, and takes the guess work out of brewing that perfect cup of coffee.

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