Ring Beam Calculator
Enter wall length, thickness, beam height and reinforcement to get concrete, formwork and steel weights.
Quick answer
With the default inputs: Wall length 30 · Wall thickness 0.24 · Beam height 0.18 etc.Ring beam concrete 1.296 m³
Edit the inputs below to recalculate.Inputs
Result
Ring beam concrete
1.296m³
| Formwork (two sides) | 10.80m² |
| Main bar length | 126.0m |
| Main bar weight | 111.9kg |
| Stirrup count | 151pcs |
| Length per stirrup | 0.783m |
| Stirrup weight | 26.3kg |
| Total steel | 138.2kg |
Stirrup length = perimeter − 8 × cover + 2 × 11.9d hooks. No soffit formwork is counted because the beam sits on the wall; add it if the beam is suspended or cast monolithically with a slab.
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Formula
| Concrete | V = wall length × wall thickness × beam height |
| Formwork | A = wall length × 2 × beam height |
| Stirrup count | N = ceil(length ÷ spacing) + 1 |
| Stirrup length | l = 2 × [(thickness − 2c) + (height − 2c)] + 2 × 11.9d |
| Steel weight | W = total length × 0.00617 × d² |
30 m wall, 240 mm thick, 180 mm beam, 4Φ12 main bars, Φ6@200 stirrups, 25 mm cover: 1.296 m³ concrete, 10.8 m² formwork, 126 m / 111.9 kg main bars, 151 stirrups / 26.3 kg, 138.2 kg steel total.
How to work it out
- Concrete V = wall length (total ring beam length) × thickness × beam depth.
- Formwork A = length × 2 × depth. Both sides are formed; the underside sits on the wall and is not.
- Main steel = bars × (length + anchorage) × 0.00617 × d², with anchorage by lap or la into columns.
- Stirrup count N = ⌈length ÷ spacing⌉ + 1.
- Stirrup length = 2 × [(thickness − 2c) + (depth − 2c)] + 2 × 11.9d.
Where it goes wrong
- Forming three faces — a ring beam bears on the wall top, so only two sides need formwork; three faces overstates it by 50%.
- Assuming a fixed 180 or 240 mm depth — depth is at least 120 mm and at least a quarter of the wall thickness, with the actual value from the design, typically 180-240 mm.
- Leaving ring beams broken at openings — where an opening cuts the beam, an additional beam must bridge it with at least 1 m of overlap, and that length is often missed.
Material and cost
C25 concrete about 420 per m³, formwork 55-70 per m², steel around 4,500 per tonne. A 240 wall with a 180 mm ring beam takes 0.043 m³, about 8 kg of steel and 0.36 m² of formwork per metre — roughly 75-95 per metre all in.
On site
- The ring beam must be continuous and closed; where an opening interrupts it, bridge around rather than break, since closure is what provides confinement.
- In seismic areas ring beams are mandatory at every floor of multi-storey masonry and cannot be omitted.
- Where a ring beam also acts as a lintel, reinforce it as a lintel with closer stirrups over that length.
Basis
- GB 50003-2011 Code for design of masonry structures, Section 7.1 (ring beams)
- GB 50011-2010 Code for seismic design of buildings, Section 7.3 (ring beam requirements)
- GB 50203-2011 Code for acceptance of masonry construction, Chapter 8
FAQ
Where do ring beams belong?
At eaves, each floor level and the top of foundations in masonry buildings; in seismic zones also mid-height depending on storey height and wall thickness. They tie the wall together, improve integrity and shear capacity, and limit cracking from differential settlement. Add them for walls over 5 m long or 4 m high even without seismic requirements.
Why is formwork only counted on two sides?
The beam sits directly on the wall top, so there is no soffit to form. Only lintel spans over openings, suspended lengths, or beams cast monolithically with the slab need soffit formwork. Adjust if your site leaves a groove in the wall top or uses a bed layer.
Ring beam vs lintel — interchangeable?
A ring beam runs the full wall length for integrity; a lintel spans an opening and carries the wall above it. Different position, different function, not interchangeable. Where an opening coincides with the ring beam level the beam may serve as the lintel, but must be checked and detailed as one.
Cite this page
Use this format in reports, method statements or coursework. The link is permanent.
Building Calculator. Ring Beam Calculator. 2026-10-25. https://jianzhujisuan.com/en/ring-beam
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.