How to Use the Scoville Spiciness Comparison Calculator
The Scoville Heat Unit (SHU) was created in 1912 by pharmacist Wilbur Scoville to measure the pungency of chili peppers based on their capsaicin content. Bell peppers, which have essentially no heat, sit at 0 SHU, while the Carolina Reaper, one of the world's hottest peppers, tops 1.6 million SHU. This calculator lets you pick two peppers or sauces and instantly see the SHU difference and exactly how many times hotter one is than the other.
A jalapeño, the pepper most Americans know from nachos and salsa, sits around 5,000 SHU, while a serrano or Thai chili is roughly twice as hot at around 10,000 SHU. A habanero at about 200,000 SHU is roughly 20 to 40 times hotter than a jalapeño, and extreme hot sauces built on pure capsaicin extract can run far beyond that. Comparing an unfamiliar pepper to one you already know helps you gauge how much heat you're actually signing up for.
Keep in mind the SHU values shown here are typical averages for each variety. In practice, growing climate, soil, harvest timing, and genetic strain can all shift the heat level of peppers sharing the same name. If you need a precise number, check the SHU rating printed on the product's packaging when available.
Frequently Asked Questions
The Scoville Heat Unit is the international standard for measuring a pepper's capsaicin content, the compound that creates the sensation of heat. Higher numbers mean spicier — bell peppers sit at 0 SHU, while the Carolina Reaper reaches around 1.6 million SHU.
Yes, the values here are typical averages. Actual heat can vary significantly within the same variety depending on growing conditions, ripeness, and genetic strain, so treat these numbers as a general guide.