Tubing Capacity Calculator
Calculate tubing capacity in bbl/ft, gal/ft, L/m, and total fluid volume from outside diameter, wall thickness, and string length.
Tubing capacity in barrels, gallons, and liters
Enter outside diameter, wall thickness, and string length. The editor calculates internal diameter, capacity per foot, total fluid volume, and fluid weight instantly.
Edit tubing and fluid
How tubing capacity is calculated
Capacity is based on the tubing's internal diameter. The editor subtracts two wall thicknesses from the outside diameter, calculates the circular area, then multiplies by string length and fill percentage. It uses 231 cubic inches per US gallon and 42 US gallons per oil barrel.
Example: 2⅜-inch tubing
For an outside diameter of 2.375 inches and a 0.190-inch wall, the calculated internal diameter is 1.995 inches. The geometric capacity is about 0.1624 gal/ft, 0.00387 bbl/ft, or 2.017 L/m.
Capacity around the tubing
To calculate fluid between tubing OD and casing ID—or combine stepped well sections—use the Annular Capacity Calculator.
Planning estimate only. The result models a smooth cylindrical bore. Verify the actual drift/internal diameter and account for connections, upset sections, coatings, scale, deformation, and equipment inside the string before field operations.
