Fire Extinguisher Calculator

Safesmart are the creator and provider of fire and health & safety compliance management software Smartlog® – the complete health & safety compliance tool for all organisations.

Portable fire extinguishers are the most common type of fire fighting equipment to be found in commercial and industrial premises; however in order to be compliant with fire safety law, the overall number of extinguishers you require is dependent upon the size of your premises.

Fire Extinguishers

The fire extinguisher calculator is a tool designed to work out how many extinguishers your workplace requires by area, to comply with fire safety legislation.

Use our free fire extinguisher calculator below to determine how many extinguishers you need:

Approximate floor area (m²):



  • The fire rating is found by multiplying the floor area in metres squared (m²) by 0.065. Therefore for a floor area of 200m² the fire rating is 200 x 0.065 = 13A.
  • A 9 litre water extinguisher has a fire rating of 13A therefore one 9 litre water extinguisher will be required for every 200m² of floor area.
  • For special risks such as fires involving live electrical equipment, a suitable extinguisher should be provided – carbon dioxide or dry powder, within close distance of the risk (or at least within 30m) usually placed next to the water extinguishers required.

With more than 11,000 accidental non-residential fires attended by the Fire and Rescue services in England during 2018/19 – consistent with recent trends, fire safety is of primary concern to businesses of all sizes and industries. Whilst a sufficient amount of fire extinguishers is an important checklist during your fire risk assessment, employees must also be well trained in their use in order to be best prepared in the event of a fire.

Safesmart provide on-site fire extinguisher training through our IOSH, NEBOSH, BAFE, and GIFireE qualified consultants.

For our consultancy services, any fire safety queries or to make an enquiry about our health & safety compliance software Smartlog®, fill in the form below:

    Safesmart LTD

    1 Warren Yard
    Warren Park
    Stratford Road
    Milton Keynes
    MK12 5NW