How to Use the Fire Extinguisher Count Calculator
Fire extinguishers are your first line of defense in an early-stage fire, but figuring out how many a space needs isn't always obvious. This tool applies general NFPA 10 coverage guidelines — enter your floor area and hazard level, and it estimates a reasonable minimum extinguisher count based on standard coverage-per-unit rules.
NFPA 10 groups occupancies into three hazard classes. Light Hazard spaces like offices and classrooms are generally covered at one 2-A rated extinguisher per 3,000 sq ft. Ordinary Hazard spaces — retail stores, light manufacturing — tighten to one per 1,500 sq ft, and High Hazard areas such as woodworking shops or chemical storage drop to one per 1,000 sq ft. In every case, no point on the floor should be more than 75ft of travel distance from an extinguisher. Keep in mind these are general guidelines, not a substitute for your local fire code — actual requirements are set by the authority having jurisdiction (AHJ) and can vary by state, city, and occupancy type, so confirm the final count before installation.
Frequently Asked Questions
NFPA 10 guidelines suggest one extinguisher (rated 2-A) per 3,000 sq ft for Light Hazard occupancies, per 1,500 sq ft for Ordinary Hazard, and per 1,000 sq ft for High Hazard, with a maximum 75ft travel distance to any unit.
No. This tool applies general NFPA 10 guidelines, but the actual number, rating, and placement required can vary by state, city, and building type. Always confirm the final count with your local fire marshal or authority having jurisdiction (AHJ).