Triangle Concrete Calculator
This triangle concrete calculator sizes three-sided pours — corner pads, wedge-shaped patios and lot-line slabs. Enter the base, the perpendicular height and the thickness.
How to Use This Calculator
- Enter your dimensions — feet for lengths, inches for thickness.
- Adjust the options — waste percentage, bag size and your local concrete price.
- Read your results — volume, bags, weight and cost update live as you type.
The Formula
Triangle volume = ½ × base × height × thickness Worked example: A triangle 10 ft base × 8 ft height at 4 in: 0.5 × 10 × 8 × 0.333 = 13.3 ft³ ≈ 0.49 yd³.
A concrete calculator for triangle sections needs the perpendicular height — the straight-line distance from the base to the opposite corner, not the length of a slanted side.
Any triangle works: right triangles against a wall, isoceles wedges, or scalene lot-line infills. If you only know the three side lengths, height = 2 × Area ÷ base via Heron's formula — or split your shape differently and use rectangles.
Triangles commonly appear as the odd corner of a larger pour. Calculate the main rectangle and the triangle separately, then add the volumes — or add the triangle as a section in the irregular shape calculator.
Frequently Asked Questions
Common questions about the triangle concrete calculator.
How do I calculate concrete for a triangle?
½ × base × perpendicular height × thickness. A 12 × 9 ft right-triangle corner at 4 in: 0.5 × 12 × 9 × 0.333 = 18 ft³ ≈ 0.67 yd³.
Which measurement is the height?
The perpendicular distance from the base line to the opposite vertex — measured at 90° to the base, not along a slanted edge.
What if I only know the three sides?
For a right triangle, the two legs are base and height. Otherwise compute area with Heron's formula and multiply by thickness — or ask us via the contact page.
Can I combine a triangle with other shapes?
Yes — compute each piece and sum, or use the irregular shape calculator to enter multiple sections at one thickness.
Related Calculators
More tools from the concrete calculator family.