SettingsSettings for this calculationUS
The total length of the wall run.
The length the BAR runs, which is the length of the bond beam rather than of the wall. Bond beam steel is continuous through corners and is lapped rather than stopped and restarted, so carry the measurement around the corner and let the lap allowance cover the splice. Where the beam stops at a full-height opening and restarts beyond it, that is two runs, and each cut end needs anchorage this does not add.
How many horizontal reinforced bond beam courses the wall has.
Common locations include the top course (bearing/tie beam), mid-height, and at floor/roof diaphragm connections.
The bar size used in the bond beam.
The bar the drawing calls for, not the bar on the truck. Size moves mass far faster than it looks: #4 to #5 is about 56% more steel by weight. Where the drawing gives a size and a spacing, the two are read together — a larger bar at the same spacing is a different wall, and not a better one where the steel is there for crack control rather than strength.
Bond beam rebar mass
152 lb
Assumes a single continuous bar per course — if your design uses multiple bars per bond beam course (common for wider blocks or higher loads), multiply the result by the number of bars per course.
- Total rebar length (incl. lap splice)
- 227.7 ft
They open the calculator with your figures already in it
Masonry Bond Beam Rebar Calculator: 152 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)
- Bond beam rebar runs continuously along the wall length in each reinforced course; total length = wall length x number of bond beam courses x 1.15 lap-splice allowance, converted to mass via standard ASTM A615 linear density
Inputs used
- Wall Length
- 66 ft
- Number of Bond Beam Courses
- 3
- Rebar Bar Size
- #4 (1/2 in, 12.7 mm)
Intermediate steps
- Total rebar length (incl. lap splice)
- 227.7 ft
Confidence note: Assumes a single continuous bar per course — if your design uses multiple bars per bond beam course (common for wider blocks or higher loads), multiply the result by the number of bars per course.
What this calculation does not cover
- This is a quantity take-off, not a design. It does not decide how many bond beam courses a wall needs, where they sit, or which bar size carries the load. Those come from the structural drawings or an engineer working to the masonry code in force.
- Every course is billed at the full wall length with a single bar in it. Bond beams that run only part of the wall, such as a lintel course over an opening, are charged as full-length runs, and a two-bar bond beam needs the result multiplied by the number of bars per course.
- The 15 percent lap allowance is a flat uplift on total length. It is not derived from your bar size, stock length, or the lap length your drawings call for, and it excludes corner and intersection bars, hooks and bends at wall ends, development into columns or pilasters, and the dowels tying the bond beam to the vertical reinforcement.
- Steel only. There is no grout to fill the bond beam channel, no bond beam block units, no horizontal joint reinforcement in the courses between bond beams, and no chairs, positioners or tie wire.
- The mass comes from nominal ASTM A615 bar weights and is not a stick count. Rebar is supplied in fixed stock lengths, so offcuts, the drop from cutting to length, and any waste allowance are not in this figure.
- Only the two US customary bar sizes are offered, and the millimetre figure beside each one is that imperial bar's own diameter, not a metric bar designation — the #4 is taken at 0.994 kg/m and the #5 at 1.552 kg/m, their nominal A615 weights. Metric reinforcement is different steel: a 12 mm bar runs about 0.888 kg/m and a 16 mm bar about 1.578 kg/m, so a #4 quantity here is heavier than the same length of 12 mm bar and a #5 quantity slightly lighter than the same length of 16 mm. If your drawings call up metric bar, scale the mass by the ratio of the two weights.
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.
Part of a bigger job
This trade is one line of a job takeoff. Run the whole job and every other trade comes back with it, off the same measurements.
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 2026-09-05 · in the site-wide review of 2026-09-06 · v1.0.2
Regulatory standards & verification citations1
- Bond beam rebar runs continuously along the wall length in each reinforced course; total length = wall length x number of bond beam courses x 1.15 lap-splice allowance, converted to mass via standard ASTM A615 linear density
Which documents these citations point at
Standards referenced: ASTM A615 (ASTM International, United States).
Cite this page
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Tools and safety for this job
To fix reinforcement. Generic types, no brands, no prices.
Protection this work requires
- Saws, grinders and breakers run above 85 dB, where hearing damage accumulates and does not recover: defenders or plugs for every cut, not just the long ones.
- Breakers and grinders cause permanent nerve damage: limit continuous trigger time, keep hands warm, and stop if fingers tingle or blanch.
- Boards, blocks and bagged material cause most lasting back injuries on small sites: two people or a lifter for full sheets, and never a bag on one shoulder up a ladder.
- Nailing, chiselling and cutting all throw fragments: glasses to EN 166 or ANSI Z87.1, and goggles rather than glasses overhead.
Show the 4 tools this job needsHide tools
Essential
Tape measure
Recommended
Rebar cutter and bender
Rebar tying tool
Optional
Angle grinder
Also needed as materials: cutting and diamond discs, tie wire.
what each concrete tool is for, and the spec that decides which to buy where one does.