Substitutions

What can I use instead of red pepper flakes?

Q: Can I use cayenne pepper instead of red pepper flakes?

1 1/2 tsp red pepper flakes = 1/2 tsp cayenne. Cayenne is finely milled and free of the bulky seeds and pith, so it packs roughly three times the capsaicin into the same spoon. Smooth, even heat with no visible flecks. A pizza or an aglio e olio loses part of its look.

Q: Can I use gochugaru instead of red pepper flakes?

1 tsp red pepper flakes = 2 tsp gochugaru. Korean chilli flakes are milder and fruitier, so roughly double the volume lands at a similar heat while keeping the flaked texture. Sweeter, brighter red and much less harsh. Excellent in Korean and stir-fried dishes, less familiar on Italian food.

Coarsely crushed dried red chillies, seeds included, usually a mix of varieties in the fifteen to thirty thousand Scoville range.

What it does in a recipe: Uneven, punctuated heat plus visible red flecks — the heat arrives in bursts rather than as a uniform background. Pick the swap that covers that job — the ratios below are written so you can act on them without doing any arithmetic.

Also called: Crushed red pepper, Peperoncino flakes

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Spicescategory

Quick answer

Cayenne pepper

1 1/2 tsp red pepper flakes = 1/2 tsp cayenne

All substitutes, best first

4 ways to replace red pepper flakes

Cayenne pepper

Reliable

1 1/2 tsp red pepper flakes = 1/2 tsp cayenne

Cayenne is finely milled and free of the bulky seeds and pith, so it packs roughly three times the capsaicin into the same spoon.

MethodStir it in thoroughly. Unlike flakes, cayenne disperses completely and cannot be picked around by anyone at the table.

Trade-offSmooth, even heat with no visible flecks. A pizza or an aglio e olio loses part of its look.

CookingSaucesFryingVeganVegetarianGluten-freeDairy-freeEgg-freeNut-freeSoy-free

Gochugaru

Reliable

1 tsp red pepper flakes = 2 tsp gochugaru

Korean chilli flakes are milder and fruitier, so roughly double the volume lands at a similar heat while keeping the flaked texture.

Trade-offSweeter, brighter red and much less harsh. Excellent in Korean and stir-fried dishes, less familiar on Italian food.

CookingSaucesRaw / no-cookVeganVegetarianGluten-freeDairy-freeEgg-freeNut-freeSoy-free

Fresh chilli, finely chopped

Reliable

1 tsp red pepper flakes = 1 small fresh red chilli, finely chopped

The capsaicin is the same compound; the difference is that fresh chilli brings water and a green vegetal note the drying process removes.

MethodAdd fresh chilli early in cooking so its heat has time to distribute into the fat, and taste before adding more.

Trade-offBrighter and grassier, with heat that varies unpredictably from one chilli to the next.

CookingRaw / no-cookSaucesVeganVegetarianGluten-freeDairy-freeEgg-freeNut-freeSoy-free

Hot sauce

In a pinch

1 tsp red pepper flakes = 1 to 2 tsp hot sauce, added at the end

A chilli-and-vinegar sauce delivers capsaicin in solution, which distributes instantly rather than needing time in hot fat.

Trade-offAdds acidity and salt, and none of the texture or the visible flecks. Fine in a soup, useless on a finished pizza.

SaucesCookingVeganVegetarianDairy-freeEgg-freeNut-freeSoy-free

Allergen checkBottled sauces are formulated products; some use wheat-derived thickeners or are made on lines shared with other allergens. Check the label before serving to someone avoiding gluten, and treat a severe allergy as a matter to confirm with the maker.

Worth knowing

Most of the heat in a jar of flakes sits in the seeds and pale pith rather than the red skin. Shake the jar before measuring or the bottom of it will be much hotter than the top.

At a glance

Red pepper flakes in summary

Category	Spices
Job in a recipe	Uneven, punctuated heat plus visible red flecks — the heat arrives in bursts rather than as a uniform background
Suits	Vegan, Vegetarian, Gluten-free, Dairy-free, Egg-free, Nut-free, Soy-free
Swaps available for	Dairy-free Egg-free Gluten-free Nut-free Soy-free Vegan Vegetarian
Number of substitutes	4

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Cooking around an allergy? Diet tags here describe the ingredient itself, not any particular brand. Processed products change formulation without notice and shared production lines are common, so read the label on everything you use. A severe allergy is a medical matter — confirm with the manufacturer or your clinician rather than relying on a substitution chart.