Introduction
Hypothetical case study — illustrative example, not a real project. The numbers below are worked through with the same methods taught across this site, but the project, the builder, the supplier prices, and the costs are fictional and intended to demonstrate the estimating process, not to represent any actual build.
The scenario: a home workshop needs a heavy-duty storage rack — two upright frames with shelf beams, sized to hold bins of hardware and tools. The builder wants the full picture before ordering: cut list, total weight, stick count, and a material budget. The Steel Tube Weight Calculator provides the weight math; this walkthrough shows how the whole estimate comes together.
The Project (Hypothetical)
A freestanding storage rack, 8 ft wide × 2 ft deep × 7 ft tall, with three shelf levels. The design uses 2×2×3/16 in square tube (A513 mechanical) throughout — adequate for a non-structural storage rack (a structural application would require an engineer’s sizing; see the code compliance guide). Shelf decks will be plywood on the beams; the tube frame carries the structure.
The Cut List
| Piece | Qty | Length each | Total |
|---|---|---|---|
| Uprights | 4 | 7 ft (2.13 m) | 28 ft (8.53 m) |
| Shelf beams (front/back) | 6 | 8 ft (2.44 m) | 48 ft (14.63 m) |
| Side braces | 4 | 2 ft (0.61 m) | 8 ft (2.44 m) |
| Total | 14 | 84 ft (25.60 m) |
The Weight Math
Published weight for 2×2×3/16 in: 4.32 lb/ft (6.43 kg/m).
Step 1 — Total length: 84 ft (25.603 m).
Step 2 — Weight: 84 × 4.32 = 362.9 lb; × 0.45359237 = 164.6 kg.
Step 3 — Cross-check in metric: 25.603 m × 6.4290 kg/m (4.32 × 1.4882) = 164.6 kg — agreement both ways.
Step 4 — Waste allowance: 10% for the mixed cut lengths: 362.9 × 1.10 = 399.2 lb (181.1 kg) to order.
Step 5 — Stick count: 84 ft of cuts + waste ≈ 92.4 ft → five 20-ft sticks (100 ft). Nesting check: the six 8-ft beams pair two-per-stick across three sticks (16 ft each, room for a 2-ft brace in each), and the four 7-ft uprights pair two-per-stick across two more sticks (14 ft each, room for the remaining brace) — the five-stick count holds with sensible offcuts.
The Cost Estimate
Material priced per pound at a retail yard, $2.00/lb planning rate: 399.2 × 2.00 = $798 → budget $800–$850 allowing for per-stick rounding and price variation. Per-stick check: five 20-ft sticks of 2×2×3/16 (86.4 lb each) at ~$170/stick = $850 — consistent, confirming the per-pound figure. Cutting: the yard charges $3/cut × 14 cuts = $42 if the builder doesn’t own a saw. Delivery: $75 local. All-in material budget: roughly $920–$970, before plywood decks and fasteners.
All prices are typical US planning ranges — regional variation applies, and steel prices move. The full pricing methodology is in the cost guide.
What If the Wall Were Heavier?
To show why wall choice matters, rerun the same 84-ft cut list in 2×2×1/4 in (5.59 lb/ft) instead of 3/16: 84 × 5.59 = 469.6 lb (213.0 kg); with 10% waste, 516.5 lb (234.3 kg) to order. At $2.00/lb that’s about $1,033 in steel — roughly $235 more than the 3/16-in version for the same rack. The stick count stays at five (same footage), but every stick now weighs 111.8 lb instead of 86.4 lb — noticeably harder to handle solo. For a non-structural storage rack, the heavier wall buys nothing but cost and sore arms; the weight math makes the trade-off visible before a dollar is spent.
What Could Go Wrong
Even a clean estimate has failure modes worth naming. If the builder had skipped the waste allowance, the first miscut would have meant a sixth stick and a second delivery fee — likely $170+ in steel plus another $75 delivery. If the wall had been entered as 0.1875 in (3/16) in one place and “3/16” misread as gauge somewhere else, the weight — and the quote — would have been fiction. And if the rack were destined for a commercial space rather than a home shop, the whole project would need an engineer’s review before the first cut, per the code compliance guide. Estimating is cheap; rework is not.
What the Estimate Reveals
- The rack weighs 363 lb before decks and contents — a two-person assembly job, and worth knowing before it has to be moved across the shop.
- Waste was the swing factor: skipping the 10% allowance would have left the order at 84 ft — under five sticks’ worth of cuts with zero margin for a single miscut.
- Nesting confirmed the stick count rather than just dividing footage by 20 — the 8-ft beams pairing two-per-stick is what makes five sticks sufficient.
- The per-stick cross-check caught nothing — which is the point: two pricing methods agreeing means the budget is solid. Disagreement between per-pound and per-stick pricing, on the other hand, is a signal to ask the supplier why before ordering. See the estimating guide for the method.
Related Guides
- Estimating Guide — the cut-list-to-order method used here.
- Cost Guide — how weight becomes a material budget.
- Order Checklist — the final review before buying.
- DIY vs Pro — build it yourself or hire a shop.
- Pro Tips — nesting, verifying, and ordering advice.
Get Your Number
This hypothetical rack took five steps from sketch to order: cut list, weight, waste, sticks, budget. Your project follows the same path. Run your dimensions through the Steel Tube Weight Calculator, apply a realistic waste allowance, nest the cuts into stocked lengths, and price the result with local suppliers.
Disclaimer: This is a hypothetical case study — an illustrative example, not a real project. Calculator results are planning estimates based on the dimensions you enter. Actual tube weights and prices vary by mill, supplier, region, and market conditions. Verify all figures with your supplier, and consult a licensed professional or your local building authority for structural or code-related decisions.
