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Steel Calculator
How much TMT steel does your house need? Thumb-rule quantity and dated cost.
Quick Answer
An RCC-framed house in India needs about 3–4 kg of TMT steel per sq ft of built-up area — roughly 3–4 tonnes for a 1,000 sq ft house, costing ₹1.65–2.72 lakh at ₹55–68/kg retail (as of Jul 2026). Single-storey houses on firm soil sit near the bottom of the band; long spans, more floors and higher seismic zones push toward the top. Enter your area below for the range and cost.
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The Formula
Steel (kg) = built-up area (sq ft) × 3–4 kg/sq ft (thumb rule, cutting wastage included)
The thumb-rule band comes from the published cost model below, not a typed constant, and already includes 3–5% cutting wastage — do not add wastage again. Actual tonnage is fixed by the structural design; this range is for budgeting and for sanity-checking a bar bending schedule.
Assumptions & Wastage
- RCC-framed residential construction, ground to G+2, conventional slab spans
- The 3–4 kg/sq ft band already includes 3–5% cutting and lapping wastage — never add more on top
- Rate is retail-delivered Fe500/Fe500D in small quantities; trade list prices run lower and brand premiums 5–8% higher
- Rough distribution across elements for a typical house: footings 15–20%, columns 20–25%, beams 25–30%, slabs 30–35% — indicative only, the design governs
- Bar weight follows the IS 1786 nominal mass, in practice the d²/162 formula
Worked Examples
1,000 sq ft single-storey house
- Built-up area: 1,000 sq ft (all floors)
- Thumb rule: 3–4 kg TMT per sq ft, cutting wastage included
- Steel: 1,000 × 3–4 kg = 3,000–4,000 kg (3–4 tonnes)
- Cost: 3,000–4,000 kg × ₹55–68/kg = ₹1.65 L to ₹2.72 L (as of Jul 2026)
1,500 sq ft G+1 house (750 sq ft per floor)
- Built-up area: 750 sq ft × 2 floors = 1,500 sq ft
- Steel: 1,500 × 3–4 kg = 4,500–6,000 kg (4.5–6 tonnes)
- Cost: 4,500–6,000 kg × ₹55–68/kg = ₹2.48 L to ₹4.08 L (as of Jul 2026)
Rates & Model Data Used
Every number below is a range with a date — material prices in India move quickly, so always check the "as of" month before relying on a figure.
| Item | Rate / value | As of | Note |
|---|---|---|---|
| Steel (TMT) | 3–4 kg / sq ft | Jul 2026 | Thumb rule incl. wastage |
| TMT steel bars (Fe500/Fe500D) | ₹55–68 / kg | Jul 2026 | Retail delivered, small quantities. Trade/brand list price runs ₹48–58/kg (Fe500D ₹52–58; base primary-mill ~₹49,000/tonne, NCR, Jul 2026). 8 mm bars carry ₹1–3/kg premium over 12–16 mm; premium brands +5–8%. Monsoon (Jul–Sep) is the soft season. Official anchors (verified 2026-07): CPWD DAR 2023 Fe500D ₹55.5/kg ex-GST (+18% GST = ₹65.5 — brackets this band almost exactly); Clause 10CA Dec 2025 ₹45.8/kg ex-primary-producer; WPI mild steel +1.7% over 24 months — lifted to high. Caution: basic-metals WPI firmed +7% YoY by Apr 2026; recheck quarterly. |
How to Use This Calculator
- Enter the built-up area. Sum the floor area of every floor. Balconies and utility areas that get RCC slabs count.
- Read the range, not a number. The low end fits compact single-storey plans on good soil; the high end fits long spans, cantilevers and seismic zones IV–V.
- Compare against the BBS. Once your engineer issues a bar bending schedule, its total should land inside this band — if it is far outside, ask why before ordering.
- Time the purchase. Steel is the most price-volatile major material. Monsoon months (Jul–Sep) are typically the soft season, and the rate table below shows the dated band used here.
Frequently Asked Questions
How much steel is required for a 1,000 sq ft house?
About 3,000–4,000 kg (3–4 tonnes) of TMT steel for a conventional RCC-framed house, including cutting wastage. At ₹55–68/kg retail (as of Jul 2026) that is ₹1.65–2.72 lakh — typically the second-largest single material cost after cement-related work.
How do I calculate the weight of one TMT bar?
Weight per metre = d²/162, where d is the diameter in mm. So an 8 mm bar weighs 0.395 kg/m, 10 mm = 0.617, 12 mm = 0.889, 16 mm = 1.580, 20 mm = 2.469 and 25 mm = 3.858 kg/m. A standard 12 m length of 12 mm bar therefore weighs about 10.7 kg.
How many 12 mm rods make one tonne?
A 12 m long 12 mm bar weighs 12²/162 × 12 ≈ 10.67 kg, so one tonne is roughly 94 rods. For 8 mm bars it is about 211 rods, for 16 mm about 53 — always cross-check a supplier's rod-count arithmetic against the d²/162 weight.
Which steel grade should I buy — Fe500, Fe500D or Fe550?
Fe500D is the sensible default for houses: same strength class as Fe500 with higher ductility, which matters in seismic zones, at a negligible price difference (₹1–3/kg). Fe550 buys little in low-rise residential work. Whatever the grade, buy ISI-marked primary-mill bars, not re-rolled stock.
Where does the steel actually go in a house?
Roughly: footings 15–20%, columns 20–25%, beams 25–30% and slabs 30–35% of the total, with the balance in staircases, lintels and chajjas. This is why steel arrives on site in phases — you do not need the full tonnage on day one.
Can I reduce the steel quantity to save money?
Only through design — compact plans, regular column grids and shorter spans genuinely need less steel. Cutting bar sizes or spacing against the drawings is structural risk, not saving. If a quote seems steel-heavy, pay for a design review rather than negotiating the tonnage.
Why is the steel quantity a range and not exact?
Because the exact tonnage is set by the structural design — soil, spans, floors and seismic zone. The 3–4 kg/sq ft band is where the great majority of Indian low-rise houses land, so it is honest for budgeting; your bar bending schedule is the number to order against.
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Sources & Limitations
- CPWD Delhi Analysis of Rates 2023, Civil Vol. I — rate analyses & material coefficients (RCC item 4.1.2, mortar 3.11, brickwork 6.3, steel wastage item 5.22); official PDF, mirror host(accessed Jul 2026)
- IS 10067:1982 Material Constants in Building Works — Bureau of Indian Standards (brick counts Tables 3-4; constants stated 'excluding wastages')(accessed Jul 2026)
- House Construction Cost in India 2026 — JK Cement (the tiers band; single tier-3 source, low confidence, structure-only denominator)(accessed Jul 2026)
- Primary TMT Bar Prices — OfBusiness (live trade data)(accessed Jul 2026)
- Steel Price Per Kg India 2026 — Comaron(accessed Jul 2026)
- WPI press release Apr 2026 — Office of the Economic Adviser, DPIIT(accessed Jul 2026)
What this calculator does not model
- Not a structural design or a bar bending schedule — the drawings govern the actual tonnage
- Assumes conventional RCC frame; steel-structure, PT-slab or precast systems calculate differently
- Cost excludes binding wire, cover blocks, cutting/bending labour and transport
- High-rise construction (above roughly G+3) needs more steel per sq ft than this band