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Lintel Rebar Calculator

§ Code basis: GB 50003-2011 + 12G614 (China) — This system has no equivalent in other codes - there is no value to convert. Redo it to your local code.

Span picks the main bars; stirrups follow spacing. Steel weight in one go.

Quick answer

With the default inputs: Clear span 1.5 m · Wall thickness 0.24 m · Lintel depth 0.2 m etc.Total steel 9.9 kg

Use your own dimensions ↓

Inputs

pcs

Result

Total steel
9.9kg
Main bars (suggested)2 x 12 mm
Within the span tableYes
Total length2.00m
Main bars per lintel7.95kg
Stirrups Φ6@20011bars
Stirrups per lintel1.91kg
Concrete volume0.096m³
How this is worked out

Main bars are picked by clear span: 2x10 mm up to 1.0 m, 2x12 up to 1.5 m, 2x14 up to 2.0 m and 2x16 up to 2.4 m, two bars top and two bottom with Φ6 stirrups at 200 mm. This table is the usual order of magnitude for masonry lintels, not a code limit; beyond 2.4 m there is no entry and a real design must check the wall load above and the actual span. Concentrated loads, an opening right next to another, or lightweight block walls all change the detailing. Stirrups are set in 25 mm from each end. Main bar length = total length - 2 x cover + 12d hooks at both ends; actual cutting length also depends on the anchorage detail. Total length = clear span + bearing at both ends, normally 250 mm each for brickwork and never less than 240 mm; too little bearing and the masonry at the support crushes before the lintel does anything.

Next up: Lintel Quantity Calculator · Lintel Load and Moment Calculator

Formula

Total lengthLtot = span + 2 × bearing
Main bar lengthl = Ltot − 2×25 + 2×12d
Main bar weightWm = count × l × d² × 0.00617
Stirrup countn = ⌈(Ltot − 50)/200⌉ + 1
Stirrup perimeterc = 2×[(b−50)+(h−50)] + 100
Total steelW = (Wm + Ws) × number of lintels
1.5 m clear span, 240 mm wall, 200 mm deep, 250 mm bearing each end: 2x12 mm bars top and bottom (4 bars total), 2.00 m total length, ~7.95 kg of main bars, 11 stirrups at ~1.91 kg, ~9.9 kg steel per lintel and ~0.096 m³ concrete.

Basis

The codes below are listed for comparison. This calculator returns GB 50003-2011 + 12G614 values only.

FAQ

Can I just look up the rebar by span?
For a self-weight masonry lintel a span-based lookup is a reasonable order-of-magnitude rule on site. But you must calculate whenever there is a concentrated load above (a beam, column or plant), a second opening right next to it with a short pier between, lightweight block such as AAC or hollow block, or a span over 2.4 m. In those cases a span table will be unsafe - cast the lintel in reinforced concrete and design the bars for the actual load.
How much bearing should a lintel have?
250 mm each end for brickwork, and never less than 240 mm. Block walls usually take 250-300 mm; AAC walls need 300 mm or more because of their low strength, or are better cast in place. Seismic regions have minimum bearing requirements as well. Too little bearing crushes the wall under the lintel end, which shows up as a diagonal crack at the top corner of the opening.

Cite this page

Use this format in reports, method statements or coursework. The link is permanent.

Building Calculator. Lintel Rebar Calculator. 2026-10-25. https://jianzhujisuan.com/en/lintel-rebar

Results are estimating aids only and are not a design basis. Construction and final accounts must follow the drawings, the applicable standards and an approved method statement. Anything affecting structural safety, shoring or falsework must be checked by a suitably qualified engineer.