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How many fire extinguishers do I need?

Carrying out a fire risk assessment will determine the type and number of fire extinguishers required.

Fire extinguishers for use on Class A fires, flammable solids such as paper, wood, textiles, are rated on their ability to extinguish test fires. The test rating is displayed on the extinguisher label.

British Standard 5306 has a formula for calculating the number of class A extinguishers. As a general rule one 13A extinguisher covers 200 square meters.

To calculate how many 13A extinguishers are needed divide the floor area by 200, and round up. Try our floor space calculator below.

There should be a minimum of two extinguishers per floor with a combined rating of at least 26A unless the upper floor area is very small, below 100m2, and in single occupancy, in which case, only a minimum rating of 13A is required on the upper floor.

Floor space calculator

Our floor space calculator provides an estimate of the number of fire extinguishers required based on floor space. It does not take into account specific risks that may require specialist fire fighting equipment. It is therefore essential that you carry out a full fire risk assessment to make sure you have sufficient and appropriate fire protection in place.