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Triangle Concrete Calculator
Calculate concrete volume for triangular slabs, footings, and surfaces
📐 Triangle Concrete Formula: (Base × Height × Depth) ÷ 2 = Volume
Triangular slab diagram — area = (base × height) ÷ 2
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Calculate triangle concrete volume — fast, free, no signup
How to Calculate Concrete for a Triangle
The formula for a triangular slab is simple: Area = (Base × Height) ÷ 2, then multiply by thickness for volume. This calculator handles right triangles, equilateral, isosceles, and general triangles with ease.
Triangle Area Formula: (Base × Height) ÷ 2
Concrete Volume Formula: Area × Thickness
For right triangles, base and height are the perpendicular sides. For equilateral/isosceles, height is calculated using geometry.
How to Use This Calculator
- Select triangle type: Right, equilateral, isosceles, or scalene
- Enter dimensions: Base, height, and for scalene triangles, all three sides
- Set thickness: Enter the depth of concrete in inches
- Add quantity: For multiple identical triangles (e.g., 4 identical footings)
- Choose bag size: Select 40, 60, or 80 lb bags
- Add waste factor: 5-10% recommended for breakage and spillage
- Enter cost per bag: Get material cost estimate
Triangle Types Explained
- Right Triangle: Has one 90° angle. Use base and perpendicular height.
- Equilateral Triangle: All sides equal. Height = (√3 ÷ 2) × side.
- Isosceles Triangle: Two equal sides. Height calculated from base and equal sides.
- Scalene / General: All sides different. Area uses Heron's formula.
Example Calculation
- Right triangle: Base 10 ft, Height 8 ft, Thickness 4 inches
- Area: (10 × 8) ÷ 2 = 40 ft²
- Volume (cubic feet): 40 ft² × (4 ÷ 12) ft = 13.33 ft³
- Volume (cubic yards): 13.33 ÷ 27 = 0.49 yd³
- 60 lb bags: 13.33 ft³ ÷ 0.45 ft³ per bag = ~30 bags
Concrete Bag Coverage (approximate)
- 40 lb bag: Covers about 0.30 cubic feet (0.011 cubic yards)
- 60 lb bag: Covers about 0.45 cubic feet (0.017 cubic yards)
- 80 lb bag: Covers about 0.60 cubic feet (0.022 cubic yards)
- Always add 5-10% waste factor for spillage, uneven ground, and form variations
Concrete Mixing Tips
- For small projects (under 1 yard), bagged concrete is most convenient
- For larger pours, consider ready-mix truck delivery
- Proper mixing ratio: follow manufacturer instructions on the bag
- Curing time: concrete reaches 90% strength in about 4 weeks
- Keep concrete damp during curing for maximum strength
Common Triangle Concrete Applications
- Gable ends — triangular portions of walls
- Corner footings — angled foundation supports
- Decorative slabs — unique patio or walkway shapes
- Ramp sides — triangular supports for accessibility ramps
- Retaining wall wings — angled support structures
Frequently Asked Questions
- How do I measure a triangle for concrete? — Measure the base (longest side) and the perpendicular height from base to opposite corner.
- What if my triangle is not a right triangle? — The calculator handles equilateral, isosceles, and scalene triangles automatically.
- How much concrete do I need for a triangular slab? — Use the formula (base × height ÷ 2) × thickness, then convert to cubic yards.
- Should I order extra concrete? — Yes, add 5-10% waste factor for spillage, uneven subgrade, and variations.
- What's the difference between cubic feet and cubic yards? — 27 cubic feet = 1 cubic yard. Ready-mix concrete is sold by the cubic yard.