Pipe Weight Calculator
Estimate pipe weight for your project with our free calculator. Get accurate material quantities, costs, and specifications.
Formula
Weight/ft = pi x (OD^2 - ID^2) / 4 x 12 x Density
The weight per foot of pipe equals the cross-sectional area of the pipe wall (annular ring) multiplied by 12 inches, then multiplied by the material density in pounds per cubic inch. The inner diameter equals the outer diameter minus twice the wall thickness.
Worked Examples
Example 1: 4-inch Schedule 40 Carbon Steel
Problem: Calculate the weight of 5 pieces of 4-inch Schedule 40 carbon steel pipe (OD 4.500\", WT 0.237\") at 20 feet each.
Solution: Cross-section = pi x (2.25^2 - 2.013^2) = 3.174 sq in\nVolume per foot = 3.174 x 12 = 38.09 cu in/ft\nDensity = 490/1728 = 0.2836 lbs/cu in\nWeight/ft = 38.09 x 0.2836 = 10.80 lbs/ft\nPer pipe = 10.80 x 20 = 216.00 lbs\nTotal = 216.00 x 5 = 1,080.00 lbs
Result: 10.80 lbs/ft, 1,080 lbs total for 5 pipes
Example 2: 2-inch Stainless Steel 304 Pipe
Problem: Calculate weight for 2-inch SS304 pipe (OD 2.375\", WT 0.154\") at 10 feet.
Solution: Cross-section = pi x (1.1875^2 - 1.0335^2) = 1.075 sq in\nWeight/ft = (1.075 x 12) x (501/1728) = 3.74 lbs/ft\nTotal = 3.74 x 10 = 37.4 lbs
Result: 3.74 lbs/ft, 37.4 lbs total
Frequently Asked Questions
How do you calculate the weight of a pipe?
Pipe weight is calculated by determining the cross-sectional area of the pipe wall, multiplying by the length to get volume, and then multiplying by the material density. The cross-sectional area equals pi times the outer radius squared minus pi times the inner radius squared, where the inner radius is the outer radius minus the wall thickness. For carbon steel pipe, a quick formula is Weight per foot = 10.69 times (OD minus wall thickness) times wall thickness, where OD and wall thickness are in inches and the result is in pounds per foot.
What are common pipe schedules and what do they mean?
Pipe schedules define the wall thickness for a given nominal pipe size. Common schedules include Schedule 10 (thin wall), Schedule 40 (standard), Schedule 80 (extra heavy), and Schedule 160 (double extra heavy). For example, a 4-inch nominal pipe has an outer diameter of 4.500 inches in all schedules, but wall thickness ranges from 0.120 inches in Schedule 10 to 0.531 inches in Schedule 160. Higher schedule numbers mean thicker walls, greater pressure ratings, and heavier weight per foot. Schedule 40 is the most commonly used for general industrial and plumbing applications.
How much does steel pipe weigh per foot?
Steel pipe weight per foot varies greatly depending on diameter and wall thickness. Common examples include 1-inch Schedule 40 at 1.68 lbs/ft, 2-inch Schedule 40 at 3.65 lbs/ft, 4-inch Schedule 40 at 10.79 lbs/ft, and 6-inch Schedule 40 at 18.97 lbs/ft. For Schedule 80, weights increase to 2.17, 5.02, 14.98, and 28.57 lbs/ft for the same nominal sizes respectively. These weights are for bare carbon steel pipe without coatings, flanges, or fittings, which would add to the total installed weight.
How do I calculate the water capacity of a pipe?
The internal volume of a pipe is calculated using the internal diameter. The formula is pi times the inner radius squared times length. To convert from cubic inches to gallons, divide by 231 (there are 231 cubic inches in one US gallon). For example, a 4-inch Schedule 40 pipe with an internal diameter of 4.026 inches holds 0.6604 gallons per foot. Knowing the fluid capacity is important for hydrostatic testing, estimating system volume for chemical treatment, and calculating the weight of fluid-filled piping for structural support calculations.
Is my data stored or sent to a server?
No. All calculations run entirely in your browser using JavaScript. No data you enter is ever transmitted to any server or stored anywhere. Your inputs remain completely private.
Can I use the results for professional or academic purposes?
You may use the results for reference and educational purposes. For professional reports, academic papers, or critical decisions, we recommend verifying outputs against peer-reviewed sources or consulting a qualified expert in the relevant field.