REBAR & STEEL · 13 TOOLS
Rebar & Steel Calculators
Rebar calculators for site, detailing and estimating: weight and tonnage by bar size, lap and development lengths to ACI 318-19 and IS 456, bar spacing, cutting lengths for bending schedules, chairs, ties, cutting waste and cost. Metric bar sizes (mm) and US bar numbers (#3–#18) are both supported, plus weights of plates, pipes, hollow sections and angles.
Rebar Chair Spacing CalculatorCalculate rebar chairs for a slab at your spacing: chair height from slab thickness, covers and bar sizes, cutting length and chair steel weight. Free accountRebar Cost CalculatorEstimate rebar cost supplied and fixed (steel price, cutting and bending, fixing labour and sundries, with wastage) per tonne and per kg, in any currency. Free accountRebar Cutting Length CalculatorCalculate rebar cutting length for a bar bending schedule: straight, L, U, closed stirrups with 135° hooks and cranked bars, from outside dimensions.Rebar Development Length CalculatorCalculate rebar development length (Ld) in tension and compression to ACI 318-19 (ψt, ψe, ψg, λ) or IS 456:2000 (τbd), in mm, inches and bar diameters.Rebar Diameter ConverterConvert rebar sizes between metric (mm) and US bar numbers (#3–#18) with diameter in mm and inches, area, unit weight and the nearest equivalent by area. Free accountRebar Grid CalculatorCalculate a rebar grid's bars each way, intersections, number of ties and kilograms of tie wire, with grid weight per m² or ft². Metric and US bars. Free accountRebar Lap Length CalculatorCalculate rebar lap splice length in tension and compression to ACI 318-19 (Class A/B, ψ factors) or IS 456:2000, in mm, inches and bar diameters.Rebar Quantity CalculatorCalculate the number of rebar bars, total length, stock bars and weight for a slab or footing mesh from its size, bar spacing and cover. Metric and US bars.Rebar Spacing CalculatorCalculate centre-to-centre rebar spacing for a number of bars, or how many bars fit at a spacing, with clear spacing checked against the ACI minimum.Rebar Tonnage CalculatorCalculate total rebar tonnage from bar schedule totals for up to five bar sizes, with weight per size, stock bars to order and wastage. Tonnes or US tons. Free accountRebar Wastage CalculatorCalculate rebar cutting waste (cuts per stock bar, offcut length, stock bars to buy, waste percentage and waste weight) for any cut length and stock length. Free accountRebar Weight CalculatorCalculate rebar weight by bar size and length: kg per metre with D²/162, total kg and tonnes, or lb/ft for US #3–#18 bars. Includes a full weight table.Steel Weight CalculatorCalculate steel weight for plates, flat bar, round and square bar, pipe, rectangular hollow sections and angles. kg/m, total kg and tonnes, or lb/ft.