# General Formulas

When figuring quantities, remember to double check your measurements, allow for compaction (equals higher yield per CY), allow for a waste factor and always round up.

### General Quantity Formulas:

Length x Width = Square Feet

Square Feet x Depth = Cubic Feet

Cubic Feet / 27 = Cubic Yards

##### Example 1:

Standard Driveway or Pad to be

covered with Stone, 6″ Deep ‎

15′ x 25′ = 375 Square Feet

375′ x .5 (6″ Depth) = 187.5 Cubic Feet

187.5 / 27 = 6.94 Cubic Yards (round up

to 7 yards)

##### Example 2:

L-Shaped Driveway or Pad to be

covered with Stone, 7″ Deep

This would be done in two

sections.

18′ x 40′ = 720 Square Feet

10′ x 40′ = 400 Square Feet

400′ + 720′ = 1,120 Square Feet

1,120 x .58 (7″ Depth) = 649.60

Cubic Feet

649.60 / 27 = 24.06 Cubic Yards

### Square Footage Inside of a Circle:

Length x Width x .7854 = Square Feet

##### Example:

24′ Round Swimming Pool

24′ x 24′ = 576′

576′ x .7854 = 452.39 Square Feet (total inside pool)

To add 4″ of sand evenly across pool:

452.39′ x .33 (4″ depth) = 149.29 Cubic Feet

149.29 / 27 = 5.53 Cubic Yards

To be safe, always round up. You would order 6 Cubic Yards of sand.

### Length Around a Circle:

Diameter x 3.1416 = Linear Feet Around a Circle

##### Example:

Length Around a Circle, 18′ Round

Swimming Pool

18′ x 3.1416 = 56.55′ (total linear feet around pool)

To add 2′ of stone around this pool 3′ deep:

56.55′ x 2′ = 113.10′

113.10′ x .25 (3″ depth) = 28.28 Cubic Feet

28.28 / 27 = 1.05 Cubic Yards