Does one tablespoon weigh the same grams in every ingredient?

No. One tablespoon does not give the same grams in every ingredient, because a spoon measures volume, not weight. The weight of an ingredient that fits into the same volume depends on the ingredient itself; that is why spoon equivalents are known not as a single number but ingredient by ingredient.

What does a spoon measure?

A measuring tablespoon holds a fixed volume; what decides how many grams that volume comes to is what you put into it. The standard household measures of USDA FoodData Central show this in a single row: the same measuring tablespoon is the equivalent of 21 g in honey, 18 g in table salt, 14.2 g in salted butter and 13.5 g in olive oil. The spoon did not change; only the ingredient put into it did.

The difference grows as the volume grows. The cup equivalents from the same source run like this: 1 cup of wheat flour is 125 g, granulated sugar 200 g, table salt 292 g, honey 339 g. We are talking about the same container, and the difference between them doubles and triples. This also explains why the phrase "one glass" in a recipe spoils the result in some ingredients.

How does this look in Türkiye's own measures?

TÜBER, Türkiye's national dietary guideline, shows the same relationship in its own items while defining portions. One standard portion of cooked legumes is ¾ cup, 130 g and 8 tablespoons. One standard portion of cooked vegetables is 1 cup, 150 g and 4-5 tablespoons. Fewer spoons can mean more grams.

The guideline's own solution accepts this difficulty as well: for ease and accuracy when measuring legumes, it recommends measuring with a ladle instead of a tablespoon. In other words, changing the measuring tool is a more useful correction than counting the number of spoons more carefully.

Do not mix up two separate sources of error

The first is the spoon itself. The same guideline writes that tablespoons produced in Türkiye are not standard, that they differ between companies and from imported ones, and that their volume has shrunk from 15 mL to 10-12 mL compared with 35-40 years ago. This error creates a difference between two kitchens even with the same ingredient.

The second is the subject of this piece: even when the spoon is the same, the grams change when the ingredient changes. One comes from the measuring tool, the other from the thing being measured. You do not have to solve both at once, but you do need to know which one you are dealing with; otherwise you fix the spoon and think you have solved the problem.

Where does this difference matter and where does it not?

It matters in items that have a big effect in a small volume: liquid oil, butter, honey, pekmez (grape molasses), tahini and salt. In these, a spoon more or less visibly changes what ends up on the plate, and it repeats several times during the day.

In items such as vegetable dishes, rice or soup, a single spoon does not noticeably change the plate as a whole; there the spoon is already a rough estimating tool and using it that way is enough. On the recipe side the situation is different: in ingredients such as flour and salt, a difference of a spoon changes not only the portion but the outcome of the cooking.

What can you do today?

You can put the spoon you use most in the kitchen on a scale once and write down the equivalent for the two or three ingredients you use regularly; this measurement, done once, is never repeated. Sticking the note you wrote on the jar or the inside of the cupboard door keeps you from having to remember it every time. Always using the same spoon instead of pouring oil from the bottle is the shortest way to fix the measure. And in items such as legumes, you can try using a ladle instead of a spoon.