Construction Material Calculators
Free online calculators for cement, steel, bricks, concrete, plaster, tiles and paint — plus a per-sq-ft building material estimator for quick bill-of-quantities budgeting. IS-code-based formulas, instant results.
Building Material Estimator
Approximate bill of quantities from built-up area, using accepted Indian thumb rules
Bill of Quantities (BOQ) Calculator — per sq ft Material Estimator
Enter built-up area to get an approximate bill of quantities for a standard RCC-framed residential building (G+1 or G+2) using accepted Indian thumb rules.
Estimated quantities for 1,000 sq ft
| Material | Estimated quantity | Thumb rule |
|---|---|---|
| Cement | 400 – 500 bags | 0.4–0.5 bags/sqft |
| Steel (TMT) | 3,500 – 4,500 kg | 3.5–4.5 kg/sqft |
| Sand | 1,200 – 1,500 cft (~12–15 brass) | 1.2–1.5 cft/sqft |
| Aggregate (20 mm) | 1,500 – 2,000 cft (~15–20 brass) | 1.5–2 cft/sqft |
| Bricks | 8,000 – 10,000 nos | 8–10 nos/sqft |
| Flooring tiles | 1,000 – 1,300 sqft | 1–1.3 sqft/sqft |
| Paint (2 coats) | 50 – 80 litres | 0.05–0.08 litres/sqft |
Thumb rules suit preliminary budgeting only — quantities vary with soil, design and specification. High-rise structures need 4.5–6 kg steel per sq ft. Always confirm with a detailed estimate from drawings before ordering.
Material Quantity Calculators
Work-wise calculators with the formula shown under every result
Concrete Calculator (Volume + Materials)
Volume of concrete for a slab, beam, column or footing, with cement, sand and aggregate for the selected nominal mix.
Result
- Wet concrete volume
- 4.05 m³
- Cement
- 32.7 bags (1,633 kg)
- Sand
- 1.7 m³ (60 cft)
- Aggregate
- 3.4 m³ (120 cft)
Dry volume = wet volume × 1.54. Bag = 50 kg (0.0347 m³). Nominal mixes per IS 456 Table 9 are allowed up to M20; M25 and above need a design mix (IS 10262) — the 1:1:2 figure is an indicative nominal equivalent. Add 2–3% wastage when ordering.
Cement Quantity Calculator
Cement bags for a given wet volume of concrete or of cement mortar (plaster, brickwork, flooring screed).
Result
- Cement
- 80.6 bags (4,032 kg)
- Sand
- 4.2 m³ (148 cft)
- Aggregate
- 8.4 m³ (297 cft)
Concrete uses dry-volume factor 1.54; mortar uses 1.33. Example: 10 m³ of M20 needs about 81 bags. Add 2% wastage for cement when ordering.
Steel Weight Calculator (TMT Bars)
Weight of TMT reinforcement bars from diameter and length using the d²/162 formula (IS 1786 nominal mass).
Result
- Unit weight (12 mm)
- 0.889 kg/m
- Total length
- 120 m
- Total weight
- 106.7 kg (0.107 t)
- Cost
- enter rate
Weight (kg/m) = d²/162 where d is diameter in mm. IS 1786 permits rolling-margin tolerance of ±7% (up to 10 mm), ±5% (12–16 mm) and ±3% (20 mm and above) on nominal mass — reconcile against weighed delivery, not just bar count.
Brick Quantity Calculator
Bricks, cement and sand for a wall, using a 10 mm mortar joint on all beds and perpends.
Result
- Wall volume
- 6.9 m³
- Bricks (incl. wastage)
- 2,960 nos
- Mortar (wet)
- 1.55 m³
- Cement for mortar
- 8.5 bags
- Sand for mortar
- 1.77 m³ (62 cft)
Works out to roughly 408 conventional or 500 modular bricks per m³ of masonry. Frog filling and site breakage are covered by the wastage percentage — 5% is typical, use 10% for poor-quality bricks.
Plastering Calculator
Cement and sand for internal or external plaster from area, thickness and mortar ratio.
Result
- Plaster area
- 100 m²
- Mortar (wet, incl. allowance)
- 1.38 m³
- Cement
- 10.6 bags (529 kg)
- Sand
- 1.47 m³ (52 cft)
Dry volume = wet × 1.33. The default 15% allowance covers surface unevenness and wastage — increase it for undulating brickwork. Typical thicknesses: 12 mm internal, 15–20 mm external (often two coats), 6 mm ceiling.
Tile Quantity Calculator
Number of tiles for flooring or wall tiling, with wastage for cutting and breakage, plus adhesive quantity.
Result
- Area to tile
- 50 m² (538 sq ft)
- Tiles required
- 153 nos
- Adhesive (3 mm bed)
- 175 kg (8.8 bags of 20 kg)
10% wastage suits straight layouts; use 15% for diagonal layouts or rooms with many cuts. Adhesive at ~3.5 kg/m² for a 3 mm bed — a 6 mm bed for large-format vitrified tiles needs roughly double. Buy all boxes from one batch number to avoid shade variation.
Paint Quantity Calculator
Litres of paint and primer for walls or ceilings from area, number of coats and coverage.
Result
- Paintable area
- 1,000 sq ft
- Paint required
- 18.2 litres
- Primer (1 coat)
- 7.7 litres
Coverage defaults to 110 sq ft per litre per coat (typical interior emulsion on smooth plaster; exterior and rough surfaces cover 80–100). Primer at ~130 sq ft/litre. Deduct door and window openings from the wall area before entering it.
Reorder Level Calculator (Site Stores)
Stock level at which the storekeeper should raise the next indent, so material arrives before the site runs out.
Result
- Reorder level
- 70 units
- Covers consumption for
- 7 days
Reorder level = (lead time × daily consumption) + safety stock. Example: 5-day lead time × 10 bags/day + 20 bags safety stock = raise the indent at 70 bags. Review consumption rates whenever the work front changes.
Quick Reference Tables
Common construction calculations at a glance
Cement Coverage
- •1 bag cement (50 kg) = 0.0347 m³
- •Plastering 12 mm (1:4): ~1 bag / 10 m²
- •Floor screed 25 mm (1:4): ~2 bags / 10 m²
- •Brickwork 230 mm (1:6): ~1.3 bags / m³
Steel Unit Weights
- •8mm TMT = 0.395 kg/m
- •10mm TMT = 0.617 kg/m
- •12mm TMT = 0.888 kg/m
- •16mm TMT = 1.580 kg/m
Brick Quantities
- •Half brick (110 mm) wall ≈ 50–55 bricks/m²
- •Full brick (230 mm) wall ≈ 100–110 bricks/m²
- •Conventional brick ≈ 408 per m³
- •Modular brick ≈ 500 per m³
Paint Coverage
- •Interior paint: 100-120 sq.ft/L
- •Exterior paint: 80-100 sq.ft/L
- •Primer: 100-130 sq.ft/L
- •Putty: 20-25 sq.ft/kg
Standard Construction Formulas
Reference formulas used in material calculations
Concrete Mix (M20 - 1:1.5:3)
1 m³ = 8.06 bags cement + 0.42 m³ sand + 0.84 m³ aggregateConcrete Mix (M15 - 1:2:4)
1 m³ = 6.34 bags cement + 0.44 m³ sand + 0.88 m³ aggregatePlastering (1:4 ratio, 12mm thick)
10 m² ≈ 1 bag cement + 0.13 m³ sand (before unevenness allowance)Brick Wall (230 mm, 1:6 mortar)
1 m³ ≈ 408 bricks + 1.3 bags cement + 0.3 m³ sandFloor Tile Adhesive
10 m² = 30-40 kg adhesive (3-4mm bed thickness)Steel Reinforcement
Weight (kg/m) = d² / 162 (where d = diameter in mm)Nominal mixes are permitted up to M20 by IS 456; M25 and above require a design mix per IS 10262. Dry-volume factors: concrete × 1.54, mortar × 1.33.
How These Calculators Help
Accurate material estimation saves money and prevents project delays
Prevent Over-ordering
Accurate calculations mean you order exactly what you need. No excess materials sitting idle on site eating into your budget.
Avoid Stockouts
Know exactly when materials will run out with reorder level calculations. Keep your project on schedule without interruptions.
Budget Accurately
With precise material quantities, you can create accurate project budgets and avoid cost overruns.
FAQs
Common questions about construction material calculation
How do I calculate building material for a 1,000 sq ft house?
Use per-sq-ft thumb rules for a quick estimate: cement 0.4–0.5 bags, steel 3.5–4.5 kg, sand 1.2–1.5 cft, 20 mm aggregate 1.5–2.0 cft and 8–10 bricks per sq ft of built-up area. For 1,000 sq ft that is roughly 400–500 cement bags, 3.5–4.5 tonnes of steel, 1,200–1,500 cft sand and 8,000–10,000 bricks. These are budgeting figures for a standard RCC-framed G+1/G+2 house — always confirm with a detailed estimate from drawings.
How many cement bags are required for 1 m³ of M20 concrete?
About 8 bags. M20 (1:1.5:3) needs dry volume 1.54 m³ per 1 m³ of wet concrete, giving cement = 1.54 ÷ 5.5 = 0.28 m³ ≈ 403 kg ≈ 8.06 bags of 50 kg, along with 0.42 m³ sand and 0.84 m³ of 20 mm aggregate. With 2% site wastage, order about 8.2 bags per m³.
What is the formula for steel bar weight?
Weight in kg per metre = d²/162, where d is the bar diameter in mm. So a 12 mm TMT bar weighs 12²/162 = 0.888 kg/m, and a standard 12 m bar weighs about 10.7 kg. The formula comes from the nominal mass basis of IS 1786, which also allows a rolling-margin tolerance of ±3–7% depending on diameter.
How many bricks are required per square foot of construction?
The thumb rule is 8–10 bricks per sq ft of built-up area for load distribution across walls in a typical house. For a specific wall, a 230 mm (9 inch) conventional brick wall uses about 38 bricks per square metre per 100 mm of thickness — the brick calculator on this page works it out exactly from wall dimensions, brick size and a 10 mm mortar joint.
Why is wet concrete volume multiplied by 1.54?
Dry ingredients (cement, sand, aggregate) occupy more volume than the compacted wet concrete they produce, because mixing water fills voids and the mass consolidates on compaction. The accepted allowance is 54% for concrete (factor 1.54) and 33% for mortar (factor 1.33). Skipping this factor understates material quantities by a third or more — one of the most common estimation errors on site.
Is there a bill of quantities (BOQ) calculator on this page?
Yes — the first tool is a per-sq-ft BOQ calculator: enter built-up area and it returns an approximate bill of quantities (cement, steel, sand, aggregate, bricks) for a standard RCC-framed house using Indian thumb rules. It is a budgeting estimate, not a measured BOQ. For quantities you can bill against, prepare the BOQ from drawings per IS 1200 — or send us one drawing and we will do the measured takeoff.
Are these calculators as per IS codes?
The formulas follow standard Indian practice: nominal concrete mixes as permitted up to M20 by IS 456, steel unit weights on the IS 1786 nominal-mass basis (d²/162), and conventional dry-volume factors used in CPWD-style rate analysis. For M25 and above, IS 456 requires a design mix per IS 10262, so nominal-ratio outputs for higher grades are indicative only. Measurement of finished work should follow IS 1200.
Automate Material Calculations with SiteSetu
While these calculators help with individual estimates, SiteSetu helps you track materials, indents, and stock levels in one place so estimates translate into action.
About Our Construction Material Calculators
Accurate material quantity estimation is crucial for construction project success. Over-ordering ties up capital in excess inventory, while under-ordering causes project delays. These free online construction calculators estimate the right quantities of cement, steel, bricks, sand, aggregate, tiles and paint using the same formulas Indian estimators use in CPWD-style rate analysis.
The building material estimator converts built-up area into an approximate bill of quantities using per-sq-ft thumb rules — the fastest way to sanity check a budget before detailed takeoff. For the full method, from drawings to a priced BOQ, read our building estimation and costing guide and the IS 1200 method of measurement guide.
The concrete and cement calculators use the 1.54 dry-volume factor and nominal mix proportions (M7.5 through M20 per IS 456, with indicative figures for M25). The steel weight calculator uses the d²/162 nominal-mass formula from IS 1786 — pair it with our material reconciliation guide to control rolling-margin variance at delivery.
The brick calculator computes bricks and mortar from actual brick size and a 10 mm joint, while the plastering calculator applies the 1.33 mortar dry-volume factor with an unevenness allowance. For finishing work, the paint and tile calculators estimate quantities from coverage rates, coats and cutting wastage.
The reorder level calculator is built for site stores: it tells your storekeeper when to raise a purchase indent based on lead time and daily consumption, preventing both stockouts and over-stocking. To turn estimates into priced rates, see the rate analysis guide, and download ready-to-use formats from our free construction templates library.