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How to measure your oil tank

Calculating the size of your heating oil tank can often leave you scratching your head, and it’s a question we often get asked by our customers. 

Domestic and Commercial oil tanks vary in size and style, however the most common tanks usually range in size and have a capacity of between 1000 litres and 2500 litres. 

Measuring your Plastic Kerosene tank

If your oil tank is green plastic, you’ll usually find the tank details, including its capacity, either on a metal plate on the side of the tank, or embossed into the plastic.  e.g. if your tank was stamped with H2500, this would indicate that it is a horizontal tank with a capacity of 2500 litres.

Measuring your Steel Kerosene tank

If your metal tank is rectangular, you can calculate its capacity simply by measuring its sides.

  1. To find the Volume in cubic feet = height x width x length (V = H x W x L)
  2. Now multiply the volume by 6.25 gallons to establish the size in gallons
  3. Now convert the gallons to litres by multiply by 4.54609

 E.g:  A Rectangular tank that is 3 feet high by 3 feet wide and 6 feet long

  1. H x W x L = 3 x 3 x 6 = 54 cubic feet
  2. Multiply 54 by 6.25 = 337.50 gallon tank
  3. Multiply 337.50 by 4.54609 = 1534.3 Litre
  4. Your tank has a capacity of 1534 litres


Based on the above example, this is a guide and not an exact capacity.  If you are still not sure you can contact us via email and we will be happy to help.