Hot Sauce Scoville Calculator
Add your peppers and dilutions. See the estimated final SHU live.
About this calculation
This calculation assumes linear dilution of capsaicin across total sauce mass. Real hot sauces have non-linear heat perception due to fat binding (oils reduce perceived heat), pH (acidity changes capsaicin bioavailability slightly), and sugar/salt masking. Use this as a starting estimate; actual perceived heat may be 20–30% lower than calculated for sauces with oil or fruit.
How hot sauce heat works
The heat in hot sauce comes entirely from capsaicin, a molecule produced in the placental tissue of peppers (the white pith, not the seeds). When you blend peppers into a sauce, the capsaicin distributes throughout the liquid. Adding non-pepper ingredients — vinegar, water, fruit, oil — dilutes the capsaicin concentration, lowering the SHU per gram of finished sauce.
Capsaicin is hydrophobic: it dissolves in fats and oils but not in water. This means oil-based sauces distribute heat more evenly and can feel smoother on the palate, while vinegar-based sauces deliver sharper, more immediate heat. Neither changes the total capsaicin — just how it hits you.
Why this calculator is an estimate
Linear dilution (total capsaicin SHU-grams divided by total mass) is the correct first-order calculation. But several factors make perceived heat differ from calculated SHU:
Oil content. Fats bind capsaicin and slow its contact with TRPV1 receptors in your mouth. A sauce with 10% oil may feel 15–20% milder than the same SHU in a water-based sauce.
Sugar and salt. Both mask heat perception. Sugar coats the tongue and competes for sensory attention. Salt enhances flavor signals that distract from pure heat. A mango-habanero sauce feels milder than a straight habanero-vinegar sauce at the same SHU.
pH. Very acidic sauces (pH below 3.0) can slightly alter capsaicin bioavailability. The effect is small compared to oil and sugar, but it exists.
Cooking. High-heat cooking degrades capsaicin by 10–20%. Raw-blended sauces retain more heat than roasted-pepper sauces.
Balancing heat and flavor
The mistake most beginners make is using only the hottest peppers they can find. Superhots are weapons-grade capsaicin delivery systems, but they often have thin flavor profiles at small quantities. The best hot sauces layer peppers: a base of milder peppers (jalapeño, cayenne, or roasted poblano) for body and flavor, with a smaller amount of a hotter pepper (habanero, ghost) for heat.
Vinegar provides the acid backbone that preserves the sauce and balances richness. Fruit (mango, peach, pineapple) adds sweetness and rounds out harshness. Garlic and onion add savory depth. A good hot sauce is a condiment, not a dare.
Starting recipes
Approachable daily sauce (~5,000 SHU): 80g jalapeño, 20g garlic, 100ml vinegar. Blend until smooth. This is milder than Tabasco and works on everything from eggs to tacos.
Table hot sauce (~50,000 SHU): 40g cayenne, 15g habanero, 30g fruit purée (mango or peach), 80ml vinegar. A balanced sauce with real heat that does not overwhelm flavor.
Seriously hot (~350,000 SHU): 50g ghost pepper, 30g fruit purée, 60ml vinegar. This is beyond most commercial sauces. Use drops, not pours.
Stupid hot (~1.5M SHU): 50g Carolina Reaper, 30ml vinegar. Minimal dilution. This is for people who have worked up to it. Wear gloves during preparation. Ventilate your kitchen. Do not blend without a lid.
Safety with superhot peppers
Peppers above 500,000 SHU require precautions. Wear nitrile gloves when cutting and handling. Do not touch your face, especially eyes. Blend with the lid on and avoid inhaling the vapors — aerosolized capsaicin causes coughing and respiratory irritation. Clean cutting boards and blenders with oil-based soap (dish soap works) before reuse. If you get capsaicin on your skin, wash with oil or rubbing alcohol before water — water spreads it.
Frequently asked questions
What’s the hottest hot sauce I can make at home?
Theoretically, pure Carolina Reaper or Pepper X purée with no dilution would approach 1.5–2.7 million SHU. In practice, even a minimal-dilution sauce (reaper + a splash of vinegar) lands around 1–1.5 million SHU. That is genuinely dangerous to consume carelessly. Most “extreme” homemade sauces target 300,000–500,000 SHU, which is already far beyond commercial hot sauces.
Why does my sauce taste milder than the SHU suggests?
Several factors reduce perceived heat below the calculated SHU: oil in the sauce binds capsaicin and slows absorption, sugar and salt mask heat perception, acidic ingredients (vinegar, citrus) round off the initial attack, and cooking peppers reduces capsaicin slightly. A sauce calculated at 50,000 SHU may feel more like 30,000–40,000 in practice.
How much vinegar should I use?
A common starting ratio is 1 part vinegar to 2–3 parts pepper by weight. More vinegar makes the sauce thinner and tangier with lower heat. Less vinegar makes it thicker and hotter. Apple cider vinegar and distilled white vinegar are the most common; each gives a different flavor. Start with the higher vinegar ratio and reduce to taste.
Should I cook the peppers or use them raw?
Both work. Raw sauces (like traditional fermented hot sauces) preserve bright, fresh pepper flavor. Cooked sauces (roasted or sautéed peppers blended with vinegar) have deeper, sweeter, more complex flavor. Cooking reduces capsaicin slightly (10–20% loss at high heat). Fermented sauces develop umami and tang over 1–4 weeks.
How long does homemade hot sauce keep?
Vinegar-based hot sauces with pH below 3.5 keep 6–12 months refrigerated. Fermented sauces keep similarly if properly acidified. Sauces with fruit or low acid content should be refrigerated and used within 2–4 weeks. When in doubt, check pH with test strips — below 3.5 is the safety threshold for shelf-stable acidified foods.
Can I ferment hot peppers like kimchi?
Yes. Lacto-fermentation with 2–3% salt brine for 1–4 weeks is a classic hot sauce method (Tabasco uses a variation). Fermentation develops complex flavors and natural acidity. After fermenting, blend the peppers with some brine, strain if desired, and bottle. The capsaicin content does not change significantly during fermentation.