Tank Weight Calculator
Calculate empty weight of cylindrical steel tanks and vessels plus weight when filled with liquid.
Introduction
Calculate the weight of cylindrical steel tanks and pressure vessels — both empty weight and filled weight with liquid. Enter tank dimensions (diameter, height, wall thickness) and material density to get instant weight results in kilograms (kg), with automatic SI unit conversion. This tool is used by engineers and fabricators for steel plate take-off, transportation and crane lift planning, foundation and support load checks, and empty-vs-filled safety evaluation. It supports carbon steel, stainless steel, aluminum, and other vessel materials.
How This Calculator Works
Steel weight: π × D × H × t × ρ (cylindrical shell). Contents weight: π(D/2)² × H × ρ_liquid. Both dimensions in m, thickness in m (converted from mm). Plus two heads ≈ 2 × (πD²/4) × t × ρ.
Tank weight is calculated as: Empty Weight = Shell Volume x Material Density. Shell Volume = pi x D x thickness x height (the volume of the steel wall). Filled Weight = Empty Weight + Liquid Volume x Liquid Density. Liquid Volume = pi x (D/2 - thickness)^2 x height. The engine converts all inputs to SI base units (meters, kg/m3) and returns weight in kilograms.
Step-by-step process:
- Enter your input values in the calculator above
- The engine converts all inputs to SI base units (meters, kg, Pa)
- The formula is evaluated:
pi * diameter * height * thickness * density + pi * (diameter/2)^2 * height * liquid_density - Result is formatted with the appropriate unit and precision
Calculation Example
Tank Weight Formula Explained
Empty (shell) weight: W_shell = pi x D x t x H x rho, where D = tank diameter (m), t = wall thickness (m, converted from mm), H = shell height (m), rho = material density (kg/m3). The shell weight is the steel volume of the cylindrical wall (surface area pi x D x H times thickness) multiplied by density.
Heads: each flat/elliptical head adds approximately pi x D^2 / 4 x t x rho for a flat head, and roughly 5-10% of shell weight for two 2:1 elliptical heads. This engine reports shell + liquid weight; add head weight separately for total empty vessel weight.
Liquid weight: W_liquid = pi x (D/2)^2 x H x rho_liquid. Filled weight = empty weight + liquid weight. Always use the filled weight for foundation design and the empty weight plus fittings for transport planning.
Worked Example: 3 m x 6 m Carbon Steel Water Tank
Inputs: D = 3 m, H = 6 m, t = 8 mm, carbon steel rho = 7850 kg/m3, water rho = 1000 kg/m3.
Shell surface area = pi x 3 x 6 = 56.55 m2; shell steel volume = 56.55 x 0.008 = 0.452 m3; shell weight = 0.452 x 7850 = 3,551 kg.
Liquid volume = pi x 1.5^2 x 6 = 42.41 m3; water weight = 42,411 kg. Total = 45,962 kg, or about 46.0 tonnes.
If two 8 mm elliptical heads are added (approx 890 kg), the full empty vessel weight is about 4,440 kg and the filled total is about 46,850 kg.
Unit Conversion Reference
Weight: 1 kg = 2.20462 lb; 1 tonne = 1,000 kg; weight in kN = mass (kg) x 9.80665 / 1000. A 46,000 kg tank weighs about 101,400 lb or 451 kN.
Material density (kg/m3): carbon steel 7,850; stainless 304 7,930; stainless 316 7,990; aluminum 2,700; water 1,000; crude oil 850-900; diesel 830-850.
Density conversion: 1 kg/m3 = 0.0624 lb/ft3. Carbon steel in US units is 490 lb/ft3.
Tank Weight vs. Capacity
Empty weight is governed by shell surface area and wall thickness, not by capacity alone: a thin-walled large-diameter tank can weigh less than a smaller thick-walled pressure vessel of the same volume. For foundation and support design, use the filled (operating) weight including liquid and fittings; for shipping and lifting, use empty weight plus a 10% rigging safety factor. Related volume tools: Tank Volume Calculator, Tank Capacity Calculator, and Tank Surface Area Calculator provide the geometric inputs used here.
Engineering Applications
- •Pressure vessel fabrication cost estimation
- •Transportation and crane lift planning
- •Structural load calculation for tank foundations
- •Storage tank inventory and capacity planning
- •Comparing empty vs filled weight for safety design
- •Steel plate take-off and material ordering
- •Dead load input for API 650 / ASME VIII foundation design
Frequently Asked Questions
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