Fire Extinguisher Coverage Calculator
Calculate how many fire extinguishers you need for your home or business based on square footage, floor count, and risk level.
Meet NFPA 10 guidelines.
Extinguishers Needed
Fire extinguishers are the first line of defense against small fires before they become uncontrollable. Having the right number, type, and placement is critical — a fire can double in size every 60 seconds.
NFPA 10 residential guidelines:
- At minimum: one extinguisher per floor, including the basement
- Kitchen extinguisher is mandatory — most home fires start in the kitchen
- Garage: one dedicated extinguisher (grease, electrical, and fuel fire risk)
- Travel distance to any extinguisher should not exceed 75 feet (23 meters)
Commercial / business NFPA 10 standard:
- One extinguisher per 3,000 sq ft of floor space (ordinary hazard)
- Maximum travel distance: 75 feet (23 meters) to reach an extinguisher
- High-hazard areas (kitchens, server rooms): one per 1,500 sq ft
Fire extinguisher types — the right type for the right fire:
| Class | Fire Type | Use For |
|---|---|---|
| Class A | Ordinary combustibles | Wood, paper, cloth, trash |
| Class B | Flammable liquids | Grease, gasoline, oil, paint |
| Class C | Electrical fires | Wiring, appliances, electronics |
| Class K | Cooking oil/fat | Restaurants, commercial kitchens |
| ABC (multi-purpose) | All three above | Most homes — one unit covers all |
For most homes:
A 2.5 lb or 5 lb ABC multi-purpose extinguisher is the right choice. 5 lb extinguishers are preferred — they give you more time to fight the fire. Larger models (10 lb) are better for garages and workshops.
Placement tips:
- Mount near exits — grab it on the way out, not on the way in
- In the kitchen: mount on the wall near the door, NOT directly next to the stove
- Mount at 3.5–5 feet high for easy reach
- Keep away from extreme heat (attic) or freezing temperatures (unheated garage in cold climates)
- Inspect monthly: check pressure gauge is in the green zone
Expiration and maintenance:
- Inspect annually (professional inspection every 6 years)
- Replace or recharge after any use, even partial
- Most home extinguishers last 5–12 years before needing replacement
- Shake dry powder extinguishers once a month to prevent caking