Hey everyone, if you’ve ever shopped for metal materials for a project—whether it’s building a deck frame, making custom shelves, putting together a small-scale greenhouse, or even fabricating truck racks for work—you’ve probably wondered at some point, “How much does this aluminum square tubing actually weigh per foot?” It’s one of those practical questions that pops up way more often than you’d think, and trust me, getting this number right saves you from so many headaches later: overestimating weight means wasting money on extra material you don’t need, and underestimating? Well, that’s how you end up with a frame that’s too flimsy, or worse, hauling way more weight than your truck or workshop can handle. As a guy who’s been selling aluminum square tubing for over 8 years now (I started out in my garage with a truckload of leftover stock and a handwritten notepad, so I’ve heard every possible angle of this question), I’ve spent way too many late nights talking customers through this exact math, so let’s break it down simply—no fancy engineering jargon, I promise. Aluminium Square Tubing
First off, let’s get one thing straight: aluminum square tubing isn’t a flat, solid block. It’s hollow, right? That’s the whole point! Solid aluminum bar is way heavier and usually way more expensive for structural uses, so square tubing is hollow with consistent walls along all four sides. That’s why calculating weight per foot isn’t just pulling a number out of thin air—you need three key measurements, and one super important detail about aluminum itself. Let’s start with the measurements because that’s what trips most people up.
When we talk aluminum square tubing sizes, we always give the outer dimensions first, right? Like 1” x 1”, 2” x 2”, 1.5” x 1.5”—those are the outer lengths of each straight side, measured from the very outside edge of one wall to the very outside edge of the opposite wall. Then there’s the wall thickness (let’s just call it “WT” for short, everyone in the business uses that) which is how thick each of those four walls is, measured from outer edge to inner edge of the wall. For example, a 2” x 2” tube might have a 0.125” wall, which is super common for general-purpose use, or you might find heavy-duty stuff with 0.25” walls if you’re building something that needs to hold a lot of weight. Also, important note: square tubing is always perfectly square, so the length of each side is identical—no odd-shaped rectangles here, those are technically rectangular tubing, and we sell that too, but today we’re sticking to square because that’s what the question’s about.
Now, the actual math for weight per foot. I’ve got a simple formula we use in the shop every single day, no need for a calculator with extra steps, and it’s accurate enough for 99% of hobbyists, contractors, and fabricators. Here’s how it works: first, calculate the cross-sectional area of the hollow part of the tube (that’s the space inside the walls). Then subtract that from the area of the full outer square to get the area of the aluminum itself. Then multiply that area by the weight of aluminum per cubic inch, and that gives you weight per foot. Wait, let’s make that super concrete so you can test it at home. The weight of aluminum is a standard number we use: 0.0975 pounds per cubic inch. That’s a fixed value for most commercial-grade aluminum, which is what 90% of our stock is (we stick to 6061 alloy for most projects—it’s strong, easy to cut and weld, and doesn’t rust like steel, so it’s the go-to for almost everything).
Let’s use an example that’s super popular for small projects: 1” x 1” square tubing with 0.065” wall. That’s the stuff you see used for screen frames, small brackets, and hobby builds. Let’s run the numbers. First, outer square area is side length squared: 1” x 1” = 1 square inch. The inner hollow space: we take the outer side length and subtract twice the wall thickness (because there’s a wall on both sides, right? Left and right walls take 0.065” each, so total 0.13” off the outer side). So inner side length is 1” – (2 * 0.065”) = 1 – 0.13 = 0.87”. Inner area is 0.87” x 0.87” = 0.7569 square inches. Now subtract inner area from outer area to get the aluminum’s cross-section: 1 – 0.7569 = 0.2431 square inches. Now multiply that by the aluminum weight per cubic inch (0.0975): 0.2431 * 0.0975 = ~0.0237 pounds per inch. Now we need per foot, so multiply by 12 inches: 0.0237 * 12 = ~0.285 pounds per foot. Wait, that’s barely more than a can of soda? That makes total sense for thin-walled 1” square tubing—you can even carry a 10-foot stick of that with one hand, no exaggeration.
Let’s do a more common heavy-duty size, too, because I know a lot of you are working on bigger projects. Let’s say 2” x 2” square tubing with 0.125” wall—this is used for trailer frames, deck railings, and small structural supports. Let’s run that math fast: outer area is 22=4 square inches. Inner side length is 2 – (20.125) = 1.75”. Inner area is 1.75*1.75=3.0625 square inches. Aluminum area: 4 – 3.0625 = 0.9375. Multiply by 0.0975: 0.9375 * 0.0975 = ~0.0914 per inch. Times 12 inches: ~1.097 pounds per foot. So a 20-foot stick of that is just under 22 pounds—super manageable for one person to lift, way lighter than steel would be for the same strength (that’s the big draw of aluminum, by the way).
Wait, but hold up—all this math is great, but who wants to do this every time they’re at the store (or messaging their supplier, like me)? That’s why we have standard weight charts for every size and wall thickness we carry, and we put those right on our site and on every product page. But I always tell customers to double-check a few things because not all aluminum is the same. First, alloy matters a little. We use 6061 for almost everything, like I said, which is the standard structural aluminum. If someone needs pure aluminum for something like foil or gutters, that’s 3003, which is slightly lighter—about 2% lighter than 6061. That’s not a huge difference, but if you’re talking about a big order for a fleet of trucks, that adds up fast. Also, wall thickness tolerance—some cheap tubing you might find at a big box store cuts corners with thinner walls than listed, so their weight is less, but it’s also weaker. We stick to strict ASTM standards for our wall thickness, so what we say is 0.125” is actually 0.125”, not 0.11” like some no-name brands. That’s why paying a little extra for reliable tubing saves you from having to rework a whole project later.
Another thing I get asked all the time: does length matter? Wait, obviously a 10-foot stick is heavier than a 1-foot stick, but we’re talking per foot, so length only matters for total order weight, not the per-foot number. If you buy a 2” x 2” 0.125” tube, every single linear foot of that tube weighs ~1.1 pounds, whether it’s 1 foot long or 20 feet long. That’s why per-foot weight is such a handy metric—it lets you plan total load, shipping costs, material needs, without having to recalculate for whatever length you order.
Let me share a real customer story to drive this home, because I think that’s way more useful than just math. Last year, a guy reached out to me because he was building a custom utility trailer for his landscaping business. He was planning to use steel tubing at first, but realized his truck’s payload was only 1,500 pounds, so switching to aluminum would let him carry more landscaping materials without maxing out his load. He had two sizes he was considering: 2” x 2” 0.125” and 2” x 2” 0.188” (that’s thick wall, super heavy-duty). He calculated that for a 16-foot trailer frame, using the thin wall would be ~17.6 pounds per frame section, and the thick wall would be ~26.8 pounds. But he also realized that the shipping cost for 500 feet of tubing would be based on total weight, so the thinner wall saved him almost $120 on shipping, which was enough to pay for a few extra brackets. Plus, the frame was strong enough for his needs—he wasn’t hauling 1,000 pounds of dirt every day, just plants and tools. So he went with the thin wall, and texted me a month later saying the trailer worked perfectly, and he saved enough to take his wife out for a nice dinner. That’s the kind of small win that getting the weight right gives you.
Now, let’s talk about the most common mistakes I see people make when calculating this. First, mixing up outer and inner dimensions. I had a customer once who ordered a tube because he saw “1” x 1”” and assumed the inner was 1”, so he calculated way too heavy, and almost ordered twice as much as he needed. That’s why it’s critical to know: when we list square tubing sizes, outer dimensions first, always. Second, using solid aluminum weight instead of hollow. Another guy thought a 2” x 2” tube would weigh the same as a solid 2” x 2” aluminum bar—spoiler: that’s like 10 pounds per foot, way heavier than the 1.1 pounds per foot we sell. That would have been a disaster for his truck’s payload. Third, forgetting that wall thickness is two-sided. I’ve had people subtract wall thickness once instead of twice, which makes their inner area way smaller, so their calculated weight is way higher. Easy fix: always subtract (2 * wall thickness) from the outer side length, because both left and right, top and bottom walls are the same thickness.
If you’re the type who just wants to skip the math and get a straight answer, here’s a quick cheat sheet for the most common sizes we sell:
- 1” x 1”, 0.065” wall: ~0.28 lbs/ft
- 1” x 1”, 0.125” wall: ~0.47 lbs/ft
- 1.5” x 1.5”, 0.083” wall: ~0.58 lbs/ft
- 1.5” x 1.5”, 0.125” wall: ~0.84 lbs/ft
- 2” x 2”, 0.065” wall: ~0.47 lbs/ft
- 2” x 2”, 0.125” wall: ~1.1 lbs/ft
- 2” x 2”, 0.188” wall: ~1.55 lbs/ft
- 3” x 3”, 0.125” wall: ~1.76 lbs/ft
- 3” x 3”, 0.188” wall: ~2.5 lbs/ft
Numbers are rounded, exact enough for any project you’re working on.
Now, if you’re wondering why this matters for you specifically, whether you’re a DIYer building a backyard pergola, a contractor doing commercial railings, or a fabricator making custom parts, knowing that per-foot weight lets you: 1) Calculate total order weight so you can budget for shipping (heavy materials cost more to ship, obviously), 2) Check if your vehicle or project frame can handle the total load, 3) Avoid overbuying or underbuying material, and 4) Compare quotes from different suppliers—if one seller says a 2” x 2” 0.125” tube is $1.50 per foot and another is $1.20, but the first one’s wall is actually thinner (so lighter) than listed, that $1.20 is a way better deal if the strength is the same, but only if you know how to check weight.
As a supplier, I don’t just send you a price list and close the door— I actually care that your project works. Last week, a guy reached out panicking because he’d already cut 10 feet of tubing to the wrong length, and needed a replacement. I walked him through how to measure the wall thickness of his leftover piece to make sure we sent the exact same kind, so his project would line up correctly when he installed the new piece. That’s the kind of service you don’t get from big box stores or random online suppliers—you get someone who knows the product inside and out, because I sell it every single day.
If you’re ready to order aluminum square tubing, or just have more questions about weight, sizes, or which wall thickness is right for your project, don’t hesitate to reach out. Whether you need 10 feet for a small shelf or 1,000 feet for a commercial build, I can help you pick the right stuff, no complicated sales pitches, just straight answers and good pricing.
Anodized Aluminium Tubing Reference:
- Aluminum Association. (2022). Aluminum Design Manual: Properties and Specifications for Aluminum Alloys and Semi-Fabricated Products. The Aluminum Association.
- ASTM International. (2021). Standard Specification for Aluminum and Aluminum-Alloy Structural Shapes. ASTM B221-21.
- Manufacturing Engineers Handbook. (2020). Material Properties for Fabrication and Construction. Society of Manufacturing Engineers.
Zhangjiagang Channel Int’l Co., Ltd.
Zhangjiagang Channel Int’l Co., Ltd. is known as one of the most professional aluminium square tubing manufacturers and suppliers in China. Please be free to buy customized aluminium square tubing made in China here and get free sample from our factory.
Address: Dept 2118, 21st Floor, Building C#, Enjoy Plaza, No.338 Jingang Road, Yangshe Town, Zhangjiagang City, Jiangsu Province, P. R. China
E-mail: sales@channelmetal.com
WebSite: https://www.channelmetal.com/
