Oil tank volume calculator
For tanks that do not match a standard chart: measure the tank, enter the dimensions, and get full capacity plus gallons at any stick depth. All math runs in your browser at 231 cubic inches per gallon.
gallons
Enter dimensions to calculate.
Measuring tips
- Measure outside dimensions to the nearest half inch. Wall thickness matters less than honest measuring.
- For oval tanks, width is the narrow face dimension and height is the tall one. A standard 275V measures 27″ wide, 44″ tall, 60″ long.
- For buried tanks you usually cannot measure the shell. Use the standard underground charts instead, or your installation records.
- For a buried fiberglass ball, pick the ball option and enter the diameter: about 50 inches for the 285, 62 for the 550, 76 for the 1000. Full charts on the fiberglass ball page.
- The result assumes a clean, uniform shell with flat ends. Factory steel ovals have dished heads that hold about 2 percent more, which our standard charts include; dents, baffles, and sludge subtract a little.