The complete guide
Understanding chile peppers, from poblano to Pepper X.
A practical reference for how chiles actually behave in the kitchen. Built around four questions every recipe quietly asks: how hot, what flavor, which species, and where it comes from. Use this as the top-level map; each section links to a full guide on the specific pepper.
By heat level
The six heat tiers, ranked from mild to record-holder.
The Scoville scale measures capsaicin concentration in Scoville Heat Units (SHU). Numerically the scale spans seven orders of magnitude — from sweet bells at zero SHU to Pepper X at over three million. Practically, six tiers cover what cooks need to know.
Sub-jalapeño heat. Approachable for any palate. Used for flavor and color more than for burn — chile rellenos, mild salsas, Mediterranean and European cooking. Includes most dried Mexican chiles, which preserve flavor depth while staying gentle.
Jalapeño through serrano-and-cayenne range. The most-cooked tier in American kitchens. Heat is noticeable but not dominant; the chile is still a flavor ingredient, not just a heat source.
Above cayenne, below habanero. Thai bird's eye, piri-piri, and Calabrian sit here. The heat is real and immediate but the flavor still reads through. Often the upper boundary for everyday cooking before the chinense fruit-forward family takes over.
Habanero and scotch bonnet country. The Capsicum chinense fruit-and-floral flavor profile comes through alongside aggressive heat. Caribbean, Yucatecan, and West African cooking are built on this tier.
Ghost pepper territory. Heat builds and lingers in a way that most cooks haven't experienced before. Used in tiny quantities in superhot sauces and traditional Indian preserves; rarely eaten as primary flavor.
Carolina Reaper, 7 Pot Primo, Trinidad Scorpion, and Pepper X. Capsaicin levels so concentrated that the pepper functions more like an industrial heat additive than a culinary ingredient. Sub-millimeter quantities in sauce-making; not for direct consumption.
Want to see every pepper plotted on one visual scale? Open the scoville scale visualization →
By species
The five capsicum species, and what they tell you.
Every chile pepper belongs to one of five domesticated Capsicum species. The species predicts more than you'd expect — heat ceiling, flavor character, plant behavior, and growing requirements all track with species more than with the cultivar name.
Capsicum annuum
The most cultivated chile species in the world. Includes jalapeño, serrano, cayenne, poblano, Anaheim, bell pepper, and most of what shows up in mainstream grocery stores. Wide range of heat levels and flavor profiles.
In the encyclopedia
Capsicum chinense
The species responsible for nearly all of the world's hottest peppers. Habanero, scotch bonnet, ghost pepper, Carolina Reaper, 7 Pot family, and Pepper X are all chinense. Defined by fruity, floral aromatics and intense heat.
In the encyclopedia
Capsicum frutescens
Smaller, vigorous plants with thin-walled, fast-growing pods. Tabasco peppers, malagueta, and piri-piri are all frutescens. Heat is direct and clean; flavor leans citrusy.
In the encyclopedia
Capsicum baccatum
South American species, central to Andean cooking. Ají amarillo, ají limo, and lemon drop are baccatum. Distinctive tropical fruit flavor — passion fruit, mango, and citrus — at moderate-to-hot heat levels.
In the encyclopedia
Capsicum pubescens
The Andean species. Rocoto and manzano are the main cultivated examples. Recognizable by fuzzy leaves, black seeds, and a thick-walled apple-shaped pod. Cold-tolerant and slow to fruit.
By region
How chiles got everywhere — and the regional traditions they shaped.
All chile peppers originated in the Americas. The Columbian Exchange in the 1500s carried them to Europe, Africa, and Asia, and within a few generations entire cuisines were rebuilt around the new ingredient. Each region selected for different characteristics, and the result is the global chile geography we have today.
Mexico and Central America
The origin of all chile peppers and still the world's deepest chile-cooking tradition. Mexican cuisine distinguishes peppers by fresh and dried form — a single cultivar becomes two different ingredients with two different names (poblano/ancho, jalapeño/chipotle). The 'holy trinity' of dried Mexican chiles — ancho, pasilla, and guajillo — anchors mole sauces and braising liquids across central and southern Mexico.
The Caribbean
Caribbean cooking is built around Capsicum chinense — scotch bonnet, habanero, and the 7 Pot family from Trinidad. The fruit-and-floral character of these peppers shapes Jamaican jerk, Trinidadian pepper sauce, and West African dishes that traveled across the Atlantic. Scotch bonnet specifically is culinarily inseparable from authentic jerk seasoning.
South America (Andes)
Capsicum baccatum is the Andean species, and ají amarillo is its most famous cultivar — sacred to the Inca and one of the three pillars of Peruvian cuisine alongside potato and corn. The tropical fruit character of baccatum peppers is unlike anything in the chinense or annuum families. Rocoto, an unrelated Andean pubescens species, is the cold-tolerant outlier.
Southeast Asia
Chiles arrived in Southeast Asia via Portuguese traders in the 16th century and were absorbed into Thai, Vietnamese, Indonesian, and Filipino cooking within a few generations. The bird's eye chili dominates the region — small, thin-walled, aggressive heat, used liberally raw in fresh salads, dipping sauces, and stir-fries. The flavor culture is built around lots-of-chile rather than huge-individual-chile.
East Asia
Korean cuisine is built on gochugaru (the sun-dried, coarsely ground Korean chile) and its fermented form gochujang. Sichuan cooking pairs chiles with sichuan peppercorn (a different plant entirely) for the 'mala' tingling sensation. Japan's contribution is the shishito — mild, blistered, and trendy globally since the 2010s.
South Asia
Indian cooking uses dozens of regional chile cultivars, from the mild Kashmiri (prized for color and gentle warmth) to the extreme ghost pepper from Assam. The bhut jolokia (ghost pepper) was the world's hottest pepper from 2007 to 2011 and is genuinely traditional in Northeast Indian cooking — used in pickles, chutneys, and tribal preparations for centuries before its global moment.
Africa
African peppers split into two main families: the piri-piri (Capsicum frutescens) of southern Africa, made famous globally by Nando's, and the fatalii (Capsicum chinense) of Central Africa — extraordinarily fruity, less famous, increasingly used in craft hot sauce. African chile cooking emphasizes whole-pepper use in stews and pepper soups.
Europe and the Mediterranean
Europe was an early adopter after Columbus brought chiles back from the Americas. Italian Calabrian chilis became central to southern Italian cooking. Spanish padróns developed in Galicia. French Espelette earned EU Protected Designation of Origin status. Hungarian production of paprika and banana peppers defines Central European cooking. Aleppo pepper (Syrian-Turkish) is the standout from the Levant.
How to choose
Picking the right pepper for what you're cooking.
If you want…
Mild heat with vegetable flavor
Reach for poblano, Anaheim, Hatch, banana pepper, or the dried ancho. These deliver chile flavor without heat as a barrier — useful when the whole table is eating.
If you want…
Reliable medium heat for weeknights
Jalapeño is the gateway and serrano is the next step up. Fresno is the slightly fruitier red alternative. All three are widely available and predictable.
If you want…
Bright fruit-forward heat
Habanero, scotch bonnet, fatalii, or ají amarillo. The Capsicum chinense and baccatum species bring tropical fruit notes — mango, citrus, passion fruit — that annuum peppers can't match.
If you want…
Smoky depth for slow cooking
Chipotle (smoked jalapeño), Hatch green chile, or the dried Mexican holy trinity (ancho + pasilla + guajillo). These bring concentrated, savory, slightly sweet depth to braises and moles.
If you want…
Extreme heat that still tastes like something
7 Pot Douglah for flavor depth, Carolina Reaper for fruit-and-fire balance, or Pepper X if you can find it. Use small quantities and pair with fat or dairy.
If you want…
A specific cuisine's baseline pepper
Mexican: poblano/ancho. Caribbean: scotch bonnet. Thai/Southeast Asian: bird's eye. Korean: gochugaru. Italian: Calabrian. Peruvian: ají amarillo. Indian: ghost or Kashmiri. Match the pepper to the cuisine and the rest gets easier.
Tool
Scoville scale visualization
Every pepper plotted on one logarithmic chart.
Tool
Find a pepper
Filter by heat, flavor, and origin.
Tool
Compare two peppers
Side-by-side scoville, flavor, and verdict.
Stuck without the pepper a recipe calls for?
Pepper substitutes, ranked by accuracy
Every pepper in the encyclopedia carries a curated list of substitutes with ratios and flavor notes. The substitutes reference aggregates them in one searchable place.
Open the substitutes reference →