LNG Tank Volume Calculator

Size LNG storage tanks with clear inputs. See liquid volume, vapor space, and mass instantly. Download reports in one click for fast approvals today.

Calculator Inputs

Pick the closest tank shape to your design.
Ignored automatically for spherical tanks.
Dimensions convert internally to meters.
Outer mode subtracts wall and liner thickness.
Use inner diameter unless outer mode is selected.
Length of cylindrical shell section only.
Used only if dimension basis is outer.
Optional internal lining allowance.
Only used when end heads are custom (m³).
Height mode uses an exact cylinder-segment formula.
Working volume = total × (percent/100).
Used only for horizontal cylinders with flat ends.
Typical range is about 430–470 kg/m³.
Reset Results appear above this form after submission.

Example Data Table

Scenario Geometry D (m) L (m) Ends Fill Total (m³) Liquid (m³) Mass (t)
Vertical cylinder + hemispherical ends VERTICAL CYL 30 40 HEMISPHERICAL 90% 42,411.50 38,170.35 17,176.66
Horizontal cylinder (flat) at 60% fill HORIZONTAL CYL 6 18 FLAT 60% 508.94 305.36 137.41
Spherical tank at 85% fill SPHERE 18 0 N/A 85% 3,053.63 2,595.58 1,168.01
Examples are for illustration only; verify with project specifications.

Formula Used

Cylinder

Cylindrical shell volume uses:

Vcyl = π · (Di2/4) · L

Where Di is inner diameter and L is straight shell length.

Heads (each)
  • Flat: V = 0
  • Hemispherical: V = (2/3) · π · r³
  • 2:1 Ellipsoidal: V = π · D³ / 24
  • Custom: user-provided V in m³
Total, Liquid, Vapor, and Mass
Vtotal = Vcyl + 2·Vhead
Vliq = Vtotal · (Fill%/100) (default)
Vvapor = Vtotal − Vliq
Mass = Vliq · ρ, where ρ is LNG density.
Horizontal fill height (flat ends)

When height mode is selected (flat ends only), liquid volume uses a circular segment area:

A = r²·acos((r−h)/r) − (r−h)·√(2rh−h²)

Vliq = A · L, where h is liquid height in the cylinder.

These equations produce geometric estimates. Always confirm operational fill limits, nozzle dead volumes, and project-specific standards.

How to Use This Calculator

  1. Select the tank geometry and (for cylinders) the end head type.
  2. Choose your units and enter the diameter and straight length (cylinders).
  3. If you only know the outer diameter, switch to outer mode and enter thickness allowances.
  4. Set the fill percent to estimate working liquid volume and vapor space.
  5. Enter LNG density to compute an approximate stored mass.
  6. Press Calculate Volume. Use the download buttons for CSV or PDF output.

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Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.