Can I Use Flour Instead Of Cornstarch

Let’s be real: you’re standing in your kitchen, a pan of bubbling soup on the stove, and you reach for the cornstarch. The box is empty. Don’t panic. That bag of all-purpose flour staring at you from the shelf is actually a pretty good backup dancer.

The short answer? Yes, you can swap them—but it’s not a perfect one-for-one deal.

Flour and cornstarch are both starches, but they behave like two very different friends at a party. Cornstarch is the smooth operator—silky, clear, and powerful in small doses. Flour is more of a reliable, comforting presence—it gets the job done, but it needs a little more time and a tiny bit more love.

If you use flour instead of cornstarch in a sauce or gravy, you’ll need about twice as much. For every tablespoon of cornstarch, use two tablespoons of flour. Why? Because flour is only about half as strong at thickening. Think of it like swapping a double espresso for a regular coffee—you just need a bigger cup.

Here’s where the little story comes in.

Last Tuesday, my buddy Mark tried to make a glossy lemon sauce for his fish. He had zero cornstarch, so he dumped in flour cup for cup. The result? A gluey, pasty mess that looked like wallpaper paste. He learned the hard way: flour needs to be mixed with cold water first (that’s called a slurry) before you add it to hot liquid. Otherwise, you get lumps. And nobody wants lumps in their lemon sauce.

So here’s the trick: whisk two tablespoons of flour with a quarter cup of cold water until it’s smooth. Then pour it slowly into your simmering pot while stirring. It will thicken, but it won’t be translucent like cornstarch—it’ll be a little cloudy. That’s okay. You’re cooking for dinner, not a food magazine cover.

How much flour do I use instead of cornstarch? [2025] | QAQooking.wiki

When should you not use flour?

If you’re making a delicate fruit pie filling or a crystal-clear jelly, stick with cornstarch. Flour will make it look like a milky, muddy puddle. Also, avoid it in deep frying—flour creates a softer, less crispy crust than cornstarch. For crunchy stir-fry chicken, you really want cornstarch or rice flour. But for a cozy Sunday gravy or a hearty beef stew? Flour is your friend. It even adds a tiny bit of body and richness that cornstarch can’t match.

Why should you care about all this?

Because cooking is about trusting yourself when the pantry says “no.” You don’t want to run to the store for one little box of cornstarch. You want to look at that bag of flour and think, “We’ve got this.” It’s the difference between a stressful dinner and a “well, that worked out” dinner. Plus, flour is probably already in your cupboard, so you save a few bucks and a trip outside in your pajamas.

Starch Powder Uses

One last tip: if you’re using flour, simmer your sauce for a few extra minutes. Raw flour has a faint, pasty taste. Let it cook out for at least two to three minutes, and you’ll never notice it. Cornstarch thickens fast and then stops; flour keeps getting thicker the longer it simmers. So keep an eye on it, and don’t be afraid to add a splash of broth if it gets too thick.

In the end, flour isn’t a substitute—it’s a stand-in. It’s the cousin who shows up to the wedding and does a decent job at the microphone. It might not be as smooth or as clear, but it’ll fill the space with warmth. So next time you’re out of cornstarch, give flour a try. Your soup will thank you. And so will your pajama pants.