I Beam Weight Calculator
Calculate the total weight of a steel I-beam (W-shape) from its weight-per-foot designation and length.
How this calculator works
Steel I-beams, technically called W-shapes, are labeled with a designation that already tells you how much they weigh per foot — no separate weight table needed. This calculator takes that weight-per-foot value along with the beam’s length and returns the total weight of the beam.
Knowing the total weight matters for planning delivery, choosing lifting equipment, and understanding how much dead load the beam adds to a structure.
Formula: Total weight = weight per foot × length. Steel W-shapes are labeled by their weight per foot right in the designation — a W10x12 weighs 12 lb per foot, a W8x10 weighs 10 lb per foot.
Worked example
A W10x12 beam, 20 ft long:
- Weight per foot: 12 lb/ft
- Length: 20 ft
- Total weight: 12 × 20 = 240 lb
Notes
The second number in a W-shape designation, like the “12” in W10x12, is the weight per foot in pounds. There’s no lookup table needed — just read the weight-per-foot value off the beam’s stamp or spec sheet and multiply by the length you need.
How to use
Enter the weight per foot from your beam’s designation (or spec sheet) and the length of beam you need. The calculator multiplies the two to give you the total weight, which you can use for shipping, lifting, and load-planning purposes.
This is a planning estimate using standard beam-deflection mechanics, not a substitute for engineering design. Confirm actual beam size, material, and deflection limits with a structural engineer and your local building code.
Frequently asked questions
What does the W in a W-shape designation mean?
W stands for wide-flange, the most common type of steel I-beam used in construction. A W-shape designation like W10x12 gives two numbers: the nominal depth of the beam in inches, and the weight per linear foot in pounds. So a W10x12 is roughly 10 inches deep and weighs 12 pounds for every foot of length.
How do I find the weight per foot of my beam?
The weight per foot is the second number in the beam's designation, stamped right on the beam or listed on its spec sheet. A W8x10 weighs 10 lb per foot, and a W10x12 weighs 12 lb per foot. There's no separate lookup needed — the designation itself tells you the weight per foot.
Why does I-beam weight matter for a project?
Total beam weight affects how it's transported, lifted into place, and supported during installation, since heavier beams need more capable equipment and more careful handling. It also feeds into the total dead load a structure has to carry, which matters for sizing the supports and foundation beneath the beam. Knowing the total weight up front helps avoid surprises on delivery and installation day.
Does a deeper I-beam always weigh more?
Not necessarily — depth and weight per foot are related but not identical, since a beam's flange and web thickness also affect its weight. Two beams with the same nominal depth can have different weight-per-foot values depending on their exact dimensions. That's why the weight-per-foot number in the designation, not just the depth, is what you multiply by length to get total weight.
Estimates only. Verify quantities with your supplier before purchasing.