Cooking Measurement Conversions Every Home Chef Needs

I was standing in my kitchen with a half-sticky measuring cup and a recipe that made no sense

I had flour on my sleeve, a pot already warming up, and a recipe telling me to add 200 milliliters of milk like that was a normal thing to ask of a person who owns exactly zero milliliter measuring cups.

So I did what you’ve probably done: I grabbed my phone, typed a conversion, got a number, second-guessed it, and then re-typed it because surely I’d messed up a decimal.

And yeah, the food still turned out… but it bugged me. Because the thing is, cooking math isn’t “hard,” it’s just annoyingly easy to get slightly wrong, and slightly wrong is how you end up with pancakes that are weirdly bready or a vinaigrette that tastes like straight vinegar.

So this is the stuff I keep in my head now (and the stuff I built into ProCalc.ai because I got tired of doing it the hard way).

The conversions you actually use (not the ones you pretend you’ll memorize)

You don’t need a poster-sized chart that includes “1 peck equals…” whatever. You need the handful that show up every week when you’re cooking dinner and a recipe is written by someone in a different country, or from 1978, or from a baker who measures everything in grams and vibes.

Here’s the cheat sheet I wish lived on the inside of every cabinet door.

One sentence I wish more recipes would include: “weights are for accuracy, cups are for convenience.”

Because that’s the real split. If you’re cooking chili, you can be a little loose. If you’re baking bread, you can’t. And if you’re making macarons… honestly, good luck (I’ve failed those more than once).

If you want a quick helper without hunting around, I keep these calculators handy: teaspoons to tablespoons, tablespoons to cups, cups to fluid ounces, liters to milliliters, and

And yeah, you can memorize some of this, but you don’t have to. You’ve got onions on the board right now. Use the tool.

The one formula that saves you from “wait… is this doubled already?”

I used to mess this up constantly: I’d “double” a recipe and then, halfway through, I’d double something again because I forgot I already doubled it. So you end up with a stew that’s oddly salty or a cake that domes like a volcano.

This is the clean way to think about scaling anything—liquid, spices, flour, whatever.

So if a soup calls for 3 cups of broth and you want 1.5x (because you’ve got a bigger pot and you want leftovers), you do 3 × 1.5 = 4.5 cups. That’s 4 cups plus 8 tablespoons (since 0.5 cup = 8 tablespoons). And yes, I had to learn that last part the hard way.

But here’s the part nobody tells you: not everything scales perfectly. Salt is the classic one. If you double a recipe, you often don’t want exactly double the salt right away. You want “almost double,” then taste, then adjust. Baking is less forgiving, but even there, salt and spices can be handled with a little restraint.

My kitchen-tested list: conversions that show up constantly

This is the meat of it (no pun intended). These are the ones that actually come up when you’re mid-recipe and your hands are wet and you’re trying not to touch your phone.

1) Teaspoons ↔ tablespoons
3 teaspoons = 1 tablespoon. That’s it. That’s the whole thing. If a recipe says 2 tablespoons and you only have a teaspoon set clean, that’s 6 teaspoons. Annoying, but doable.

2) Tablespoons ↔ cups
16 tablespoons = 1 cup. This one is sneaky useful for butter, peanut butter, honey, and anything else that’s clingy and doesn’t want to leave the spoon. Also, if you’ve got 12 tablespoons of something, that’s 3/4 cup (because 12 is three-fourths of 16). I didn’t “get” that at first. I nodded like I understood. I didn’t.

3) Cups ↔ fluid ounces
1 cup = 8 fluid ounces. If you’re making a sauce and you want 2.5 cups, that’s 20 fluid ounces. And if you’re staring at a measuring cup that has ounces on one side and cups on the other, this is why it feels like magic when you finally trust it.

4) Milliliters ↔ liters
1000 milliliters = 1 liter. This one’s basically the calmest conversion in cooking. If a recipe says 500 mL, that’s 0.5 L. If it says 250 mL, that’s 0.25 L. You can do it in your head once you stop overthinking it (which I absolutely did for a while).

5) Grams ↔ ounces (for when you’re baking like you mean it)
This is where I’m going to be careful: grams-to-ounces is a fixed conversion, but I’m not going to pretend everyone wants to memorize the exact number. I use a calculator for this almost every time because I don’t trust my brain when I’m tired. If you’re holding a bag of flour and a recipe says 300 grams, just run

And yes, I know some people will say “just use grams.” I agree! But you still end up converting when you’re using a family recipe written in cups and you’re trying to be more consistent.

So why does everyone get this wrong? Because recipes are written like everyone has the same tools, the same measuring cups, and the same idea of what “packed” means. They don’t. You don’t. I don’t either.

Also, your measuring cups might not even match each other (especially if you’ve got a random one from a garage sale mixed into the set). That’s a whole other problem.

FAQ (the stuff people ask me while something’s already in the oven)

If you’re literally cooking right now and just need the quick conversions, here they are again: convert tsp to tbsp, tbsp to cups, cups to fl oz, L to mL,

And if you take nothing else from this: write the scaled amounts down. Don’t trust your memory. Your future self will thank you!