Pepper spray registers between 2 million and 5.3 million Scoville Heat Units (SHU), making it hundreds of times stronger than the hottest peppers most people have ever eaten. A jalapeño tops out around 8,000 SHU. A Red Savina habanero, one of the hottest peppers in the world, reaches about 500,000 SHU. Even at the low end, pepper spray is four times stronger than that.
How Pepper Spray Strength Is Measured
You’ll see three different numbers on pepper spray labels, and they don’t all mean the same thing. The most common is OC percentage, which stands for Oleoresin Capsicum. This tells you how much raw pepper extract is in the canister, typically between 2% and 10%. But OC percentage is misleading on its own because different batches of raw pepper vary in potency. A 10% OC spray made from mild peppers could be weaker than a 2% OC spray made from extremely hot ones.
Scoville Heat Units measure the heat of the raw OC ingredient before it gets diluted into the spray formula. Since OC makes up only 2 to 10% of the total product, the SHU number on the label reflects the strength of one ingredient, not the strength of what actually hits your face.
The most accurate measure is Major Capsaicinoids (MC), which is what the EPA and the U.S. federal government recognize as the true indicator of potency. MC measures the concentration of heat-producing compounds in the entire finished formula. Consumer pepper sprays typically range from 0.18% to 1.33% MC. Bear sprays, designed to stop a charging grizzly, measure between 1.0% and 2.0% MC.
What Pepper Spray Does to Your Body
The effects hit fast. According to the American Academy of Ophthalmology, eye symptoms begin within 20 to 60 seconds of exposure and include intense pain, involuntary eye closure, heavy tearing, light sensitivity, and blurred vision. Your eyes essentially shut down. Most people cannot keep them open voluntarily, which is the primary reason pepper spray works as a defensive tool.
Beyond your eyes, the spray triggers burning pain in your nose, throat, and lungs, along with coughing and shortness of breath. Skin contact causes itching, pain, and redness. The overall sensation is often described as feeling like your face is on fire while simultaneously being unable to breathe normally. It’s profoundly disorienting, which is the point.
For most people, the worst symptoms resolve within 10 to 30 minutes and don’t require medical treatment. Eye irritation sometimes lingers for a few hours before clearing on its own. Severe reactions requiring hospital care are rare but can happen, particularly in people with asthma or other respiratory conditions.
Consumer Spray vs. Law Enforcement vs. Bear Spray
Consumer self-defense sprays sit at the lower end of the potency range, generally between 0.18% and 1.0% MC. They’re designed to be compact, legal to carry, and strong enough to stop an attacker long enough for you to get away. Most canisters are small, with states like California capping them at 2.5 ounces, Florida at 2 ounces, and New Jersey at just three-quarters of an ounce.
Law enforcement sprays typically use higher concentrations and larger canisters, with formulations closer to the top of the consumer MC range or above it. Some states regulate civilian sprays to a maximum of 10% OC, including Michigan and Wisconsin.
Bear spray occupies the top tier at 1.0% to 2.0% MC, but the real difference isn’t just concentration. Bear spray canisters are much larger and project a wide cloud up to 30 or 40 feet, because you need distance between yourself and a charging animal. Consumer sprays typically reach 10 to 15 feet depending on the delivery type.
How Delivery Type Affects Strength
The same formula performs differently depending on how it leaves the canister. Stream sprays shoot a tight line of liquid, similar to a squirt gun. They offer the best range and resist wind blowback, but you need to aim accurately to hit someone’s face. This is the most common type for everyday carry.
Fog or mist sprays disperse into a wide cloud that’s much easier to aim. They saturate a larger area, making them nearly impossible to dodge. The tradeoff is shorter range and serious vulnerability to wind. Outdoors, a gust can push the mist right back at you. The fog also lingers in the air longer and contaminates a wider area, which is a problem indoors.
Gel sprays are a newer option that sticks to the target on contact, reducing blowback and contamination. They work well indoors but take slightly longer to cause full effects since the gel needs to spread across the skin and eyes.
How to Remove Pepper Spray
If you’re ever exposed, the single most important thing is flushing your eyes with clean water or saline. Remove contact lenses immediately. Scoop handfuls of water into open eyes, or use a water fountain, and keep flushing. The American College of Emergency Physicians recommends water over milk or antacid solutions, despite what you may have seen at protests.
After flushing your eyes, wash your entire face with a gentle, non-oil-based soap. For skin exposure on the rest of your body, remove contaminated clothing and wash with cool water and mild detergent for at least 15 minutes. An ice pack wrapped in a towel can help with the burning sensation on your face. Avoid greasy ointments or salves, which trap the capsaicin particles against your skin and make the pain last longer.
Size and Strength Limits by State
Pepper spray is legal for civilian self-defense in all 50 states, but many states restrict how much you can carry or how strong it can be. Hawaii has the tightest limit at just half an ounce. New Jersey allows only a single canister under three-quarters of an ounce. South Carolina caps canisters at 50cc (about 1.7 ounces), while Arkansas and North Carolina allow up to 150cc (roughly 5 ounces).
Michigan and Wisconsin both cap OC concentration at 10%, with Wisconsin also specifying the canister must weigh between 15 and 60 grams. California, Florida, and Nevada set size limits without restricting concentration. If you’re buying pepper spray, checking your state’s specific rules before purchasing saves you the risk of carrying something that’s technically illegal.