🏗️ Construction & Real Estate — Free Online Calculators & Tools

These calculators give approximate quantities for planning. Actual requirements depend on: contractor waste (5–15%), on-site conditions, design complexity, and local material standards. Always add 5–10% buffer. For structural work, always get quantities verified by a licensed civil engineer.

M = Mix strength in MPa (N/mm²) at 28 days. M15 (1:2:4 nominal mix): lightweight work, pathways, compound walls. M20 (1:1.5:3): most common for slabs, beams, columns. M25 (1:1:2): high-strength applications, heavily loaded beams. Higher grade concrete requires design mix ratios by a structural engineer.

For 9" (230mm) full brick wall: ~9–10 bricks per sq ft of wall face. For 4.5" (115mm) half brick: ~4.5–5 per sq ft. Standard Indian modular brick: 190×90×90mm with 10mm mortar joint = 200×100×100mm nominal. Always add 7–10% for breakage and cutting waste.

Standard interior emulsion: 120 sq ft per litre per coat. Average 12×10 ft room, 9 ft ceiling: wall area ≈ 360 sq ft (minus doors/windows). With 2 coats + 10% wastage ≈ 7 litres. Premium paints and rough surfaces may need 20–25% more. Always buy extra from the same production batch.

When you mix dry cement, sand, and aggregate with water, the paste fills the voids and reduces volume by ~35%. So dry materials occupy 1/(1–0.35) ≈ 1.54× more volume than the wet concrete they produce. Always multiply wet concrete volume by 1.54 to find dry material quantities needed.