How Much Does a Steel Beam Weigh? Calculator + Chart

I Almost Dropped a Beam on My Foot Because I Didn't Check the Weight

True story. I was maybe three years into working construction, and we had a W8x31 steel beam getting craned into place for a residential garage header. Someone on the crew — I won't say who — assumed it was "about 400 pounds" because it was only 12 feet long. Turns out a W8x31 at 12 feet is 372 lbs, which honestly isn't far off, but the rigging was set up for something lighter and the whole thing swung sideways when it came off the truck. Nobody got hurt, but it was one of those moments where you think, yeah, I should've just done the math.

That's the thing about steel beams. They don't look that heavy sitting on a flatbed. But the numbers add up fast.

How Steel Beam Weight Actually Works

Steel beams are designated by a naming system that literally tells you the weight, which is something I didn't realize for an embarrassingly long time. A W10x22 means it's a W-shape (wide flange), roughly 10 inches deep, and it weighs 22 pounds per linear foot. That last number — the one after the "x" — is the weight per foot. So a W10x22 that's 20 feet long weighs about 440 lbs. That's it. Multiply the per-foot weight by the length.

So why does everyone seem to get this wrong? Because people forget that the designation number IS the weight. They'll go googling "how much does a W12x26 weigh" when the answer is right there in the name — 26 pounds per foot. I mean, once someone pointed that out to me, I felt kind of dumb. But also relieved.

Here's a worked example so it really sticks:

Say you've got a W14x30 beam that's 24 feet long. The 30 means 30 lbs per linear foot. So: 30 × 24 = 720 lbs. That's your beam weight. You'd want to know that before you rent a crane, or before you try to convince four guys they can carry it (they can't, not comfortably anyway).

And it gets heavier than you'd expect for bigger sections. A W24x104 running 30 feet? That's 3,120 lbs. Over a ton and a half for a single beam!

Common Steel Beam Weights — Quick Reference

I put together this chart because I got tired of flipping through the AISC steel manual on job sites. These are some of the more common wide flange beams you'll run into on residential and light commercial work, with weights calculated at a few standard lengths.

Beam Designation	Weight per Foot (lbs)	10 ft Total	16 ft Total	20 ft Total	24 ft Total
W6x9	9	90	144	180	216
W8x18	18	180	288	360	432
W8x31	31	310	496	620	744
W10x22	22	220	352	440	528
W10x49	49	490	784	980	1,176
W12x26	26	260	416	520	624
W12x50	50	500	800	1,000	1,200
W14x30	30	300	480	600	720
W14x68	68	680	1,088	1,360	1,632
W16x40	40	400	640	800	960
W24x104	104	1,040	1,664	2,080	2,496

Those numbers are just the bare steel, by the way. They don't include fireproofing, primer coatings, or any connection plates welded on. On a real job, the actual rigging weight could be 5-10% more than the raw beam weight, which matters when you're sizing your crane pick or figuring out if the delivery truck needs a bigger trailer.

If you're trying to figure out the

, plug in the numbers and let the calculator handle the rest. It's faster than doing it on the back of a receipt in the parking lot (which, yes, I have done).

Why This Matters Beyond Just "Knowing the Number"

Beam weight feeds into basically everything on a structural project. It affects your crane rental costs, your foundation design (because the beam's self-weight is part of the dead load), your shipping logistics, and even how many laborers you need on site for installation day. I had a GC once throw out a number for a crane rental — something like 1,800 for a half day — and when I asked what capacity crane he was getting, he had no idea what the beams actually weighed. He was just guessing. That's how you end up with a crane that's either way too big (expensive) or too small (dangerous).

A few things beam weight connects to directly:

• Dead load calculations for your structural engineer — the beam holds up the floor, but the beam itself also loads the columns and footings
• Crane capacity and reach planning
• Trucking and freight costs (steel is typically priced and shipped by the ton)
• How many ironworkers you need for the erection crew

If you're doing a full structural takeoff, you'll probably also want to figure out

that support these beams. And if you're comparing steel framing against other options, a

might help you weigh the alternatives (pun intended, sorry).

For bigger commercial jobs where you're estimating total steel tonnage, the per-foot weights of every beam, column, and channel add up into your

. And don't forget about the connection hardware —

are their own rabbit hole.

The weight also matters if you're cutting an opening in a load-bearing wall and dropping in a beam as a header. Homeowners doing renovations run into this constantly. You've got a contractor telling you "we need a W8x31 across this 14-foot span" and you're wondering if your existing foundation can handle it. That 14-foot W8x31 is 434 lbs of steel sitting on two posts — your footings need to be sized for that plus everything the beam is carrying above it.

For foundation sizing, a

is genuinely useful here.

S-Shapes, C-Channels, and HSS — It's Not Just Wide Flanges

Wide flange (W-shapes) are the most common, but you'll also see S-beams, C-channels, angles, and hollow structural sections (HSS, which are basically steel tubes — square or rectangular). The naming convention is slightly different for each one, but the weight-per-foot concept is the same.

An HSS 6x6x1/4, for example, weighs about 19.02 lbs per foot. A C10x15.3 channel weighs 15.3 lbs per foot (again, the number tells you). For

across different materials and shapes, there's a calculator for that too.

Steel density is roughly 490 lbs per cubic foot, or about 0.284 lbs per cubic inch if you ever need to calculate the weight of a custom plate or odd-shaped piece. I've had to do that exactly once for a decorative bracket a client wanted, and honestly I just used a

because my brain doesn't do cubic inches to pounds without help.

Does the "x" number in a beam name always mean pounds per foot?

For W-shapes (wide flange), S-shapes (American Standard), and C-channels, yes — the number after the "x" is the nominal weight in pounds per linear foot. For HSS (tube steel), it's different — the numbers represent the outer dimensions and wall thickness, not the weight. You'd need to look up or calculate the per-foot weight separately for HSS sections.

How much does a typical residential steel beam weigh?

Most residential beams fall in the W8 to W12 range, weighing somewhere between 18 and 50 lbs per foot. A common one — the W8x31 — weighs 31 lbs per foot, so a 16-foot span would be about 496 lbs total. Heavy enough that you're not carrying it by hand, but light enough for a small crane or even a Lull telehandler.

Should I add extra weight for coatings or fireproofing?

Yes. Figure roughly 5-10% extra for primer, paint, or intumescent fireproofing. Spray-applied fireproofing (SFRM) is lighter — maybe 2-3% — but cementitious coatings can add more. Always confirm with your fireproofing spec.