Calculate the amount of concrete needed for a slab using feet and inches for measurements. This calculator provides results in cubic feet, cubic yards and cubic metres.
one cubic inch (in³) = 0.000578703703703704 cubic feet (ft³) one cubic inch (in³) = 0.0000214334705075445 cubic yards (yd³) one cubic inch (in³) = 0.000016387064 cubic metres (m³)
To convert cubic feet to cubic yards, multiply cubic feet * 0.037037037037037 To convert cubic feet to cubic metres, multiply cubic feet * 0.028316846592 To convert cubic yards to cubic metres, multiply cubic yards * 0.764554857984
slab length = 25' width = 12'-8" concrete slab thickness = 6"It all has to be in the same units. It would be possible to change it all into inches, but that makes for large numbers so it will be easier to convert the inches into a foot value.
8 ÷ 12 = 0.666 feet12'-8" then becomes 12.666 feet
6 ÷ 12 = 0.5 feetNow you can fractions the concrete volume for this slab by multiplying the length, width and depth values together.
25 * 12.666 * 0.5 = 158.325 cubic feetYou will need 158.3 cubic feet of concrete for this slab
158.325 ÷ 27 = 5.86 cubic yards.