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Construction Calculators

Free online construction calculators for concrete volume, paint estimation, square footage, and more.

Estimate concrete volume for slabs, columns, and tubes.

Estimate how much paint you need for any room.

Calculate area for rectangles, circles, and triangles.

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Estimate concrete volume for slabs, columns, and tubes

Length (ft) Width (ft) Thickness (in)

Cubic Yards

3.70

Cubic Feet

100

Cubic Meters

2.83

80lb Bags Needed

188

🏷️ ~$462.50 estimated material cost ⚖️ ~14,800 lbs total weight

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Estimate how much paint you need for your room

Room Length (ft) Room Width (ft) Height (ft) # of Doors

# of Windows # of Coats Include Ceiling?

Total Sq. Ft.

424

Gallons Needed

1.33

1-Gallon Cans

Quarts Needed

💰 Estimated cost: ~$80 (1 gallon ≈ 350 sq ft per coat)

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Calculate area of rooms in various shapes

Length (ft) Width (ft)

Square Feet

300

Square Meters

27.87

Square Yards

33.33

Acres

0.0069