Field calculator
Rebar weight calculator
Pick the reinforcing bar size, enter the length of one bar in feet, and enter how many bars of that size you have. The calculator multiplies the total linear feet by the nominal ASTM A615 unit weight for that bar (for example, a #5 bar weighs 1.043 lb per foot) and returns the weight in pounds and tons. Run it once per bar size and add the results for the full mat or member. Add for lap splices, waste, and the chairs and tie wire, and confirm the mill weight on the bar tag before you place the order.
Result
Weight:
Weight is the total linear feet times the bar unit weight. These are the nominal ASTM A615 weights for US (inch-pound) bar sizes, from #3 at 0.376 lb per foot to #11 at 5.313 lb per foot. Add for lap splices, waste, and accessories; confirm the mill weight on the bar tag before ordering.
anvilfield.com/calculators/rebar-weight-calculator · Free field calculators and FieldOS. A planning estimate, verify against the code, the manufacturer, and the engineer of record.
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Rebar weight FAQ
What is a bar bending schedule?
A bar bending schedule is the table listing every reinforcing bar on a job, one line per bar type, with the bar mark, size, grade, quantity, cut length, shape code, and bend dimensions. The fabricator cuts and bends from it and the field places from it. It is the schedule the steel is made to.
What is a bend deduction?
A bend deduction is the amount subtracted from the summed leg dimensions at each bend to get the true cut length. Measuring a bent bar leg to leg along the outside overstates the steel, because the bar rounds each bend on a radius. The deduction corrects for that so the cut length comes out right.
What are rebar shape codes?
Rebar shape codes are a standard library of bend shapes, each with a code, so a bent bar can be scheduled without drawing it. BS 8666 uses numbered codes like 00 for straight and 21 for a U; US work follows ACI and CRSI conventions. The code names the shape, and A, B, C dimensions set the leg lengths.
What is the minimum bend diameter for rebar?
The minimum bend diameter is the smallest diameter a bar bends around without cracking, set by bar size. Under ACI 318, common values run near 4d for #3 to #5 ties, 6d for #3 to #8 hooks, 8d for #9 to #11, and 10d for #14 and #18. Confirm against the adopted code edition and the project.
How is rebar cut length calculated?
Cut length is the sum of the leg segments and hook extensions minus a bend deduction at each bend. It is not the legs added up, because the bar travels the short way around each bend radius. BS 8666 gives a formula per shape code with the deduction built in. The cut length is what the shop actually shears.