Cubic Yard Calculator FAQ
Clear answers for cubic yard formulas, depth conversions, concrete, gravel, mulch, dirt, topsoil, sand, tons, weights, coverage, overage, and ordering bulk material.
The core cubic yard formula is length x width x depth in feet divided by 27. For depth in inches, use square feet x depth in inches divided by 324. Add 10 percent for most projects and 15 to 20 percent for compacted gravel, fill dirt, or soil.
FAQ Topics
Jump to the question group that matches your project, or scan the full page for direct answers.
Basics and FormulasCubic yards, cubic feet, depth, and square feet.
ConcreteSlabs, bags, thickness, weight, and overage.
Gravel and RockTons, driveway depth, compaction, and delivery units.
MulchDepth, bag conversion, coverage, and bulk weight.
Dirt and SoilTopsoil, fill dirt, settling, and lawn depth.
SandPaver sand, pool bases, sand weight, and material type.
Tons and WeightConvert between cubic yards, tons, and pounds.
Measuring and OrderingAccuracy, irregular shapes, trucks, and rounding.
Basics and Formula FAQs
What is a cubic yard?
A cubic yard is a volume measurement equal to a cube that is 3 feet long, 3 feet wide, and 3 feet deep. One cubic yard equals 27 cubic feet, 46,656 cubic inches, or about 0.765 cubic meters.
How do you calculate cubic yards?
Multiply length by width by depth with all measurements in feet, then divide by 27. The formula is cubic yards = length ft x width ft x depth ft / 27.
Why do you divide by 27 for cubic yards?
You divide by 27 because one cubic yard contains 27 cubic feet. A yard is 3 feet, so 3 feet x 3 feet x 3 feet equals 27 cubic feet.
How do I convert inches to feet for depth?
Divide inches by 12. For example, 2 inches is 0.167 feet, 3 inches is 0.25 feet, 4 inches is 0.333 feet, and 6 inches is 0.5 feet.
Can square feet be converted to cubic yards?
Yes, but only when you know the depth. Multiply square feet by depth in feet to get cubic feet, then divide by 27 to get cubic yards.
What is the formula for square feet to cubic yards?
The formula is cubic yards = square feet x depth in feet / 27. If depth is in inches, use cubic yards = square feet x depth in inches / 324.
How many cubic feet are in a cubic yard?
There are 27 cubic feet in one cubic yard. Multiply cubic yards by 27 to convert cubic yards back to cubic feet.
How many cubic yards are in one cubic foot?
One cubic foot equals 0.037 cubic yards. Divide cubic feet by 27 to convert cubic feet to cubic yards.
Concrete FAQs
How do I calculate cubic yards for concrete?
Measure length and width in feet, convert slab thickness from inches to feet, multiply length x width x thickness, then divide by 27. Add about 10 percent extra for waste and uneven subgrade.
How many cubic yards of concrete do I need for a 10x10 slab?
A 10 ft by 10 ft slab at 4 inches thick needs about 1.23 cubic yards before overage. With 10 percent extra, order about 1.36 cubic yards.
How many bags of concrete are in a cubic yard?
One cubic yard takes about 45 bags of 80 lb concrete, 60 bags of 60 lb concrete, 72 bags of 50 lb concrete, or 90 bags of 40 lb concrete.
How thick should a concrete slab be?
Patios and walkways are commonly 4 inches thick. Residential driveways are often 4 to 6 inches thick. Heavy loads, poor soil, or structural requirements may need engineering guidance.
Should I order extra concrete?
Yes. A 10 percent overage is common for concrete because forms are not perfectly exact, ground can be uneven, and some material is lost during placement.
How much does a cubic yard of concrete weigh?
A cubic yard of concrete weighs about 4,050 pounds, or roughly 2.03 tons. Wet mix, aggregate type, reinforcement, and moisture can affect the final weight.
Related: Use the concrete cubic yard calculator for slabs, patios, driveways, bag counts, and cost estimates.
Gravel and Rock FAQs
How do I calculate gravel cubic yards?
Measure the area in feet, convert gravel depth to feet, multiply length x width x depth, then divide by 27. For compacted gravel, add 15 to 20 percent extra.
How many tons are in a cubic yard of gravel?
A cubic yard of gravel is commonly estimated at about 1.4 tons, or 2,800 pounds. Dense crushed stone or wet aggregate may weigh more.
How deep should gravel be for a driveway?
A gravel driveway often needs 4 to 6 inches for light residential use, with deeper layers or multiple compacted lifts for heavier vehicles or poor soil.
How much extra gravel should I order for compaction?
For compacted gravel base layers, add 15 to 20 percent. Loose decorative gravel usually needs less extra, but spreading losses and uneven ground still matter.
Is gravel sold by the ton or cubic yard?
Both are common. Landscape yards may sell by cubic yard, while quarries and aggregate suppliers often sell by ton. Use a tons-to-cubic-yards conversion when quotes use different units.
Related: Use the gravel calculator for rock, driveway base, drainage, tons, and overage.
Mulch FAQs
How do I calculate mulch cubic yards?
Multiply bed length by bed width by mulch depth in feet, then divide by 27. For a shortcut, cubic yards = square feet x depth in inches / 324.
How deep should mulch be?
A 2 inch layer is common for refreshing existing beds. A 3 inch layer is common for new beds and weed suppression. Avoid piling mulch against tree trunks or plant stems.
How many bags of mulch equal one cubic yard?
One cubic yard equals 13.5 bags when each bag contains 2 cubic feet. It equals 9 bags when each bag contains 3 cubic feet.
How much does a cubic yard of mulch weigh?
A cubic yard of mulch often weighs about 600 to 900 pounds, but wet mulch can weigh more. Bagged and bulk mulch weights vary by material and moisture.
Do I need extra mulch?
Usually only a small amount is needed beyond the measured volume. Add up to 10 percent if the bed shape is irregular or the surface is uneven.
Related: Use the mulch calculator for bed depth, 2 cubic foot bags, coverage, and cost.
Dirt and Soil FAQs
How do I calculate dirt or topsoil cubic yards?
Measure the area, choose the depth, convert depth to feet, multiply length x width x depth, then divide by 27. Add extra if the soil will settle or be compacted.
How much does a cubic yard of topsoil weigh?
A cubic yard of topsoil commonly weighs 2,000 to 2,400 pounds, but wet topsoil can weigh more. Soil blend, organic matter, and moisture all affect weight.
How much topsoil do I need for a lawn?
For lawn repair, 1 to 2 inches may be enough. For a new lawn, 4 to 6 inches is common. Multiply square footage by depth in feet, then divide by 27.
What is the difference between fill dirt and topsoil?
Fill dirt is used for volume, grading, and backfill. Topsoil contains more organic material and is used where grass, plants, or gardens need to grow.
How much extra soil should I order?
Add 10 to 15 percent for topsoil and 15 to 20 percent for fill dirt if it will settle, be compacted, or fill uneven low spots.
Related: Use the dirt and soil calculator for topsoil, fill dirt, backfill, and grading projects.
Sand FAQs
How do I calculate sand cubic yards?
Measure the length and width, convert sand depth to feet, multiply length x width x depth, then divide by 27. Thin sand layers are sensitive to small depth changes.
How much does a cubic yard of sand weigh?
A cubic yard of sand weighs about 2,700 pounds, or 1.35 tons. Wet sand can be significantly heavier.
How deep should paver sand be?
Paver bedding sand is often about 1 inch after base preparation. Always follow the paver manufacturer or project specification for base and bedding depths.
What type of sand should I use?
Concrete sand, masonry sand, washed sand, play sand, and paver sand serve different purposes. Confirm the correct type before ordering because volume alone does not determine suitability.
Related: Use the sand calculator for paver bedding, pool bases, masonry work, and leveling layers.
Tons, Weight and Conversion FAQs
How do I convert tons to cubic yards?
Divide tons by the material tons-per-cubic-yard value. For example, if gravel is 1.4 tons per cubic yard, then 5 tons / 1.4 = 3.57 cubic yards.
How do I convert cubic yards to tons?
Multiply cubic yards by the material tons-per-cubic-yard value. For example, 4 cubic yards of gravel x 1.4 = 5.6 tons.
Why do material weights vary so much?
Moisture, compaction, aggregate size, soil blend, organic content, and supplier mix all change weight. Use average weights for planning and supplier weights for final ordering.
How much can a pickup truck carry?
A pickup may hold 2 to 3 cubic yards of light mulch by volume, but only about 1 cubic yard of heavy gravel, soil, sand, or concrete by weight. Check the truck payload rating.
Related: Use the tons to cubic yards calculator when a supplier quotes by weight.
Measuring and Ordering FAQs
How accurate is a cubic yard calculator?
The math is exact, but the result depends on your measurements and chosen depth. Irregular shapes, uneven ground, compaction, and moisture can change the amount needed on site.
How should I measure an irregular area?
Split the area into rectangles, triangles, circles, or smaller sections. Calculate cubic yards for each section, then add the totals together.
Should I round cubic yards up or down?
Round up for ordering. Most bulk projects should include a waste or compaction factor, and suppliers may require orders in quarter-yard, half-yard, full-yard, or ton increments.
Related: Use the material calculators guide to compare common weights, depths, compaction, and coverage by material.
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