Oil tank charts by size

Above ground steel tanks

The standard basement or outdoor tank is an oval (obround) steel tank. Vertical means the oval stands tall, horizontal means it lies on its side. Measure depth through the fill or gauge opening.

• 275 gallon vertical chart

  44″ max depth, about 274 gallons full

• 275 gallon horizontal chart

  27″ max depth, about 274 gallons full

• 330 gallon vertical chart

  44″ max depth, about 329 gallons full

• 330 gallon horizontal chart

  27″ max depth, about 329 gallons full

Underground (buried) tanks

Buried residential tanks are round steel cylinders read through the fill pipe. If your house predates the 1980s and has no visible tank, it is likely one of these. See how to stick a tank for the buried-tank procedure.

• 550 gallon underground chart

  48″ inside diameter, about 564 gallons full

• 1000 gallon underground chart

  48″ inside diameter, about 1018 gallons full

• 500 gallon underground chart

  48″ inside diameter, about 509 gallons full

• Fiberglass ball tanks chart

  Buried spheres (Cardinal style): 285, 550, and 1000 gallon

By brand

• Roth tanks

  Double-wall polyethylene tanks with a percentage float gauge

• Granby tanks

  Steel tanks in the standard oval sizes, matched to the right chart