📦 General Materials

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Free calculator for paint coverage, concrete volume (cement bags, sand, gravel) and insulation area. Metric units with an imperial conversion guide.

Quick answer

How much paint do I need for a room?

Measure each wall (width × height), subtract windows and doors, then multiply total area by number of coats. Typical coverage is 10-12 m²/liter for interior paints.

📐 How to Calculate Construction Materials

Calculating materials accurately saves money and reduces waste. This calculator provides professional estimates for paint coverage, concrete mixing, and insulation requirements for your construction projects.

🎨 Paint Coverage

Calculate exact quantities based on paint type, coverage rate, number of coats, and wall area. Coverage varies from 5 m²/L (textured) to 12 m²/L (flat interior).

🏗️ Concrete Volume & Mixing

Calculate cement bags, sand, gravel, and water for any concrete project. Supports standard (1:2:3), foundation (1:1.5:2.5), and lean (1:3:4) mix ratios.

🧱 Insulation Requirements

Determine rolls or boards needed based on insulation type, thickness, R-value, and area. Supports fiberglass, mineral wool, spray foam, rigid boards, and cellulose.

📊 Materials Reference Guide

🎨 Paint Coverage Rates

Type	Coverage (m²/L)	Typical Use
Interior Flat/Matte	10-12	Ceilings, low-traffic rooms
Interior Satin/Eggshell	10-11	Living rooms, bedrooms
Exterior Flat	8-9	Exterior walls, facades
Textured Paint	4-5	Feature walls, rough surfaces

🏗️ Concrete Mix Ratios

Mix Type	Ratio (C:S:G)	Bags/m³	Typical Use
Standard (1:2:3)	1:2:3	7	General purpose
Foundation (1:1.5:2.5)	1:1.5:2.5	8.5	Foundations, footings
Lean Mix (1:3:4)	1:3:4	5	Fill, bedding, non-structural

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📋 Quick Reference Calculations

How many bags of cement for 1m³ of concrete?

Approximately 6.5 bags of 42.5kg (or 7.5 bags of 94lb) with standard 1:2:3 mix ratio.

How many liters of paint for a 13ft × 13ft room?

For 8ft walls (143 sq ft / 13.3m² surface) with 2 coats of interior paint: approximately 2 gallons (7.7 liters).

How much area does a roll of fiberglass insulation cover?

A standard roll of 1.2m × 10m covers 12m² (129 sq ft). For a 270 sq ft ceiling: you need 3 rolls (with 10% waste).

❓ Frequently Asked Questions

How much paint do I need for a room?

Measure each wall (width × height), subtract windows and doors, then multiply total area by number of coats. Typical coverage is 10-12 m²/liter for interior paints.

How do I calculate concrete volume?

Multiply length × width × depth (all in meters) to get cubic meters. Add 5-10% for waste. For a standard 10cm slab: 4m × 3m × 0.10m = 1.2 m³.

What cement-to-sand ratio should I use?

Standard mix is 1:2:3 (cement:sand:gravel). For foundations use 1:1.5:2.5. For lean/fill concrete use 1:3:4. One 42.5kg bag of cement yields about 0.14 m³ of standard concrete.

How do I choose the right insulation?

Consider R-value (thermal resistance), moisture conditions, and installation method. Fiberglass batts are economical. Spray foam provides best air sealing. Rigid boards work well for exterior applications.

What R-value do I need?

R-value depends on climate zone. For walls, R-13 to R-21 is typical. For attics, R-30 to R-60 is recommended. Higher R-values provide better thermal insulation but with diminishing returns.