SettingsSettings for this calculationUS
The rebar bar size number, from the Rebar Calculator or your project plans.
The number refers to the bar's diameter in eighths of an inch — a #4 bar is 4/8 = 1/2 in diameter.
The combined length of all rebar pieces in the project.
Use the total linear footage from the Rebar Calculator's grid layout, including any overlap/lap length.
Total rebar weight
66.8 lb
- Total length
- 100 linear ft
They open the calculator with your figures already in it
Rebar Weight Calculator: 66.8 lb — shown in imperial, US market. The link sets both, so the result they see is the one on your screen.
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How this was calculated
Formula source(s)
- Standard rebar weight per foot (ASTM A615): #3 = 0.376 lb/ft, #4 = 0.668 lb/ft, #5 = 1.043 lb/ft, #6 = 1.502 lb/ft
Inputs used
- Rebar Size
- #4 (1/2 in)
- Total Rebar Length
- 100 ft
Intermediate steps
- Total length
- 100 linear ft
What this calculation does not cover
- Only US customary bar sizes #3 through #6 are offered. There is nothing for #7 and larger — the sizes that show up in columns, beams and heavy footings — and no metric or Canadian designations (10M, 15M, 20M) or European mm bar. Picking the nearest available size instead will not give the right weight.
- The total length is taken exactly as you type it. Lap splices, hooks, bends, stirrups and ties, corner extras and cut-off waste all have to be inside that figure already, because nothing here derives them. The field also stops at about 16,400 ft (5,000 m) of bar, so a larger take-off has to be split and the parts added by hand.
- These are nominal per-foot weights for the bar size, not the weight your load will scale in at. Mill weight tolerance, deformation pattern, and epoxy or galvanized coating all shift the real figure, and a supplier invoices against their own weighed tonnage rather than a theoretical one.
- This is not a reinforcement design. It says nothing about which bar size, spacing, cover, grade or layout the job needs, and no result here indicates that the steel you have chosen is adequate. Bar size and placement come from the drawings or an engineer.
- Bars only. Tie wire, chairs, bolsters, spacers, dowels, mechanical couplers and welded wire mesh are all excluded, as is bundling and dunnage — so this is not a truck payload or a crane lift weight on its own.
Estimated cost — your price
This site holds no price list for this material — local prices vary too much to publish honestly. Enter your supplier's price and the result is costed with it.
Computed in your browser — nothing you enter is uploaded. Presented in US customary units and US trade terminology. Where a formula follows a published standard, that standard and its edition are cited beside it on this page; where none governs, the page says so. Local amendments override model codes — verify against the code in force where you build.
Sources checked 2026-09-02 · in the site-wide review of 2026-09-06 · v1.0.1
Regulatory standards & verification citations1
- Standard rebar weight per foot (ASTM A615): #3 = 0.376 lb/ft, #4 = 0.668 lb/ft, #5 = 1.043 lb/ft, #6 = 1.502 lb/ft
Which documents these citations point at
Standards referenced: ASTM A615 (ASTM International, United States).
Cite this page
Your workspace
Most jobs need more than one number. Add the calculators you need next and they open right here, underneath this one — your figures stay on screen and nothing is lost to a page change.