Steel weight calculator

1. Cross-section
   width × thickness
   48 × 0.25 (in) = 12.0000
2. Weight per foot
   area ÷ 144 × 490 lb/ft³
   12.0000 ÷ 144 × 490 = 40.833
3. Total weight
   lb/ft × length × pieces
   40.833 × 8' 0" × 1 = 326.67 lb

Where the numbers come from

• Weight of the metal: Carbon steel 490 lb/ft³ (plate = 40.8 lb/ft² per inch) · 304 stainless 0.285 lb/in³ (492.5 lb/ft³) · 6061 aluminum 0.0975 lb/in³ (168.5 lb/ft³)Steel: Engineering ToolBox steel plate table, W = 40.8 × thickness (40.8 × 12 = 490 lb/ft³; ¼" = 10.2, ½" = 20.4 lb/ft²). Stainless: Rolled Alloys 304/304L data sheet (https://www.rolledalloys.ca/wp-content/uploads/304-304L_Datasheet_rolled-alloys_CA.pdf). Aluminum: Alliance 6061-T6 properties (https://www.allianceorg.com/pdfs/alumext/GradesAndProperties.pdf), 2.70 g/cc. Tube and angle are figured with square corners at the nominal wall; real HSS tube is made to a 0.93 × nominal design wall with rounded corners and real angles have rounded fillets, so AISC table weights differ a little (HSS 4×4×¼: 12.76 here vs 12.21 in AISC; L4×4×¼: 6.59 vs 6.6). Mill tolerance adds or takes a few percent.Source
• Rebar weights (ASTM A615): #3 0.376 · #4 0.668 · #5 1.043 · #6 1.502 · #7 2.044 · #8 2.670 · #9 3.400 · #10 4.303 · #11 5.313 · #14 7.650 · #18 13.600 lb/ftPublished ASTM A615 nominal weights (Continental Steel rebar chart). Each one equals the bar area × 3.40 lb/ft per in² (0.2833 lb/in³): #3–#8 are round bars n/8" across, #9, #10, #11, #14 and #18 have the area of the 1", 1⅛", 1¼", 1½" and 2" square bars they replaced. Example #5: π × 0.625² ÷ 4 = 0.3068 in² × 3.40 = 1.043 lb/ft. (That chart misprints #4 as 0.688; ASTM A615 and the math give 0.668.)Source