Construction calculators
Concrete, paint, tiles, roof pitch and mortar. Volume, bags and waste live on separate pages, with separate formulas.
Concrete and mortar
Cement in Mortar Calculator
1 m³ × 350 kg/m³ + 5% → 367.50 kg (15 bags).
Use calculator →Concrete Calculator
10×10×0.33 ft slab at 5% → 1.28 yd³. Volume, not a plant order.
Use calculator →Mortar Bags Calculator
0.30 m³ × 1600 kg/m³ + 5% → 21 bags of 25 kg.
Use calculator →Mortar Calculator
20 m² × 15 mm × 1800 kg/m³ + 5% → 567 kg.
Use calculator →Materials and insulation
Other
Square Footage Calculator
12×10 ft → 120 sq ft. 5×4 m → 20 m².
Use calculator →3-4-5 Ratio Calculator
3-4-5 → right angle; 3.05/4/5 → ≈30 mm.
Use calculator →Brick Calculator
15 m² − 2 m², 0.09 m² face, 5% → 152 bricks.
Use calculator →Floor Area Calculator
5×4 m minus 2.6 m² and 8% → 18.79 m².
Use calculator →Heating Power Calculator
50 m³ × 40 W/m³ → 2000 W (2.00 kW).
Use calculator →Insulation Calculator
120 m² × 60×120 cm board + 8% → 180 boards.
Use calculator →Linear Meter Board Calculator
20 m² × 14 cm board + 8% → 154.29 lm (39 pcs).
Use calculator →Paint Calculator
12×12×8 ft room → 1.92 gal at 400 ft²/gal, two coats.
Use calculator →Slope Percent Calculator
0.6 m over 6 m → 10.0% · 5.71°.
Use calculator →Plaster Calculator
42 m² × 1.2 kg/m² → 50.4 kg (3 bags of 20 kg).
Use calculator →Ridge Height Calculator
8 m × 35° + 2.8 m wall → 5.60 m.
Use calculator →Roof Pitch Calculator
2.8 m / 4.0 m → 34.99° and 70.0%. Angle from rise and run.
Use calculator →Room Perimeter Calculator
4×3 m → 14 m; 80 cm door + 8% → 14.26 m.
Use calculator →Room Volume Calculator
5×4×2.5 m → 50 m³. Living room 6×5×2.8 m → 84 m³.
Use calculator →Stair Calculator
2.8 m + 16 risers → 17.50 cm. Comfort band 15–20 cm.
Use calculator →Thinset Calculator
18 m² × 3.5 kg/m² + 10% → 69.30 kg (3 bags).
Use calculator →Tile Calculator
10×12 ft, 12×12 in, 10% waste → 132 tiles.
Use calculator →Wall Area Calculator
4×3×2.6 m → 36.4 m². Living room minus openings → 44.1 m².
Use calculator →Articles
Short guides for the formulas in this category. Each article leads to a calculator.