Calculate cubic feet, cubic yards, and cubic inches from construction measurements including feet, inches, and fractions.
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Enter length, width, and depth for trenches, slabs, pits, and boxes.
Enter length, width, and height to calculate.
Volume measures the amount of three-dimensional space inside a shape. In construction, volume is commonly expressed in cubic feet or cubic yards and is used for excavations, footings, trenches, slabs, tanks, columns, and other measured spaces. Enter the field dimensions in feet, inches, and fractions, and Skoppe Calculator converts the measurements and calculates the volume automatically.
Rectangular: Volume = Length × Width × Height
Cylinder: Volume = π × Radius² × Height
Radius = Diameter ÷ 2
Triangular Prism: Volume = Base × Height ÷ 2 × Length
Cubic Yards = Cubic Feet ÷ 27
Cubic Inches = Cubic Feet × 1,728
Every dimension has to be in the same unit before they are multiplied. Skoppe Calculator normalizes feet, inches, and fractions first, so rounding never compounds across three dimensions.
A trench measured in construction dimensions:
Length = 8 ft 6 in = 8.5 ft
Width = 4 ft 3 in = 4.25 ft
Depth = 1 ft 6 in = 1.5 ft
8.5 × 4.25 × 1.5 = 54.1875 cu ft
Trench volume: ≈ 54.19 cu ft · ≈ 2.01 cu ydDiameter = 3 ft
Radius = 3 ÷ 2 = 1 ft 6 in
Height = 8 ft
π × 1.5² × 8
Column volume: ≈ 56.55 cu ft · ≈ 2.09 cu ydLength = 10 ft
Width = 10 ft
Thickness = 6 in = 0.5 ft
10 × 10 × 0.5
Slab volume: 50 cu ft · ≈ 1.85 cu ydA cube measuring 1 ft × 1 ft × 1 ft. One cubic foot equals 1,728 cubic inches.
A cube measuring 3 ft × 3 ft × 3 ft, which is 27 cubic feet — the unit most large construction quantities are ordered in.
A cube measuring 1 in × 1 in × 1 in. Useful for small measured spaces and openings.
Area measures a surface in two dimensions. Volume measures three-dimensional space, so it always needs a thickness, depth, or height.
Excavations: measure trenches, pits, and rectangular excavated spaces.
Footings: calculate the geometric volume of a measured footing.
Slabs: calculate the volume of a slab from length, width, and thickness.
Columns & piers: calculate cylindrical volume from diameter and height.
Tanks & containers: measure basic rectangular or cylindrical capacity geometrically — wall thickness and irregular shapes change usable capacity.
General layout: calculate any basic three-dimensional measured space.
Cubic feet are useful for smaller measured volumes. Cubic yards are commonly used for larger construction quantities, so most excavation and concrete work is discussed in yards.
A cube measuring 3 ft × 3 ft × 3 ft is 27 cubic feet, which is exactly 1 cubic yard. To convert, divide cubic feet by 27.
A slab measuring 10 ft long by 10 ft wide has an area of 100 sq ft. Area alone does not describe how much space the slab occupies.
Add the thickness and it becomes volume: 10 × 10 × 0.5 ft is 50 cu ft, about 1.85 cu yd. Use the Area Calculator for surfaces and this calculator once a thickness, depth, or height is involved.
For a rectangular trench or excavation, measure the length, average width, and average depth, then use Rectangular mode.
If width or depth varies significantly, divide the excavation into smaller sections and calculate each section separately, then add the volumes together. An irregular excavation is not an exact rectangular solid.
Use Cylinder mode when the measured space has a circular cross section. Enter the diameter and the depth or height.
This covers round footings, columns, piers, sonotube-style forms, and circular holes. Measuring the diameter straight through the center is usually faster and more reliable in the field than measuring a radius.
| Measurement | Volume |
|---|---|
| 1 cu yd | 27 cu ft |
| 1 cu ft | 1,728 cu in |
| 3 ft × 3 ft × 3 ft | 27 cu ft · 1 cu yd |
| 10 ft × 10 ft × 1 ft | 100 cu ft · ≈ 3.7 cu yd |
| 10 ft × 10 ft × 6 in | 50 cu ft · ≈ 1.85 cu yd |
| 3 ft diameter × 8 ft deep | ≈ 56.55 cu ft · ≈ 2.09 cu yd |
Multiply the length by the width by the height, with all measurements expressed in compatible units.
Divide cubic feet by 27.
One cubic yard contains 27 cubic feet.
One cubic foot contains 1,728 cubic inches.
Find the radius by dividing the diameter by two, square the radius, multiply by pi, then multiply by the height.
Yes. Skoppe Calculator supports construction-style dimensions including feet, inches, and common fractions.
Measure the trench length, width, and depth and use Rectangular mode. If the dimensions vary, divide the trench into smaller sections and calculate each separately.
No. The Volume Calculator calculates geometric cubic volume. The Concrete Calculator is intended for estimating concrete quantities and can include project-specific estimating logic.
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