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A GOOD ESTIMATE STARTS HERE
Know what goes into your numbers.
Every estimate shows its assumptions. Adjust waste, material density, and delivery rules to match your job. Use your supplier’s actual prices for a more useful comparison.See how we calculate
2.33 yd³ incl. allowance
UNDERSTAND YOUR QUANTITY
How to calculate mulch quantities
Multiply the bed’s area by the mulch depth to find volume. Split irregular beds into non-overlapping sections and exclude areas you will not cover. Use the volume printed on the bag to convert the result to a bag count.
Measure each bed. Split irregular beds into simple shapes and exclude paths or plants you will not cover.
Convert area and depth to cubic yards. Multiply area by depth. With feet and inches, use length × width × (depth ÷ 12) ÷ 27.
Add waste or settling only when needed. Add a small waste percentage for spreading. Leave settling at zero when the chosen depth already allows for it.
Round bags once for the whole job. Divide cubic feet by the bag volume, then round the project total up once. A cubic yard is 13.5 bags at 2 ft³ each before rounding.
With length and width in feet and depth in inches, use length × width × (depth ÷ 12) ÷ 27 to get cubic yards. In metric, length in metres × width in metres × (depth in centimetres ÷ 100) gives cubic metres. One cubic yard is 0.764554857984 m³.
This example adds 5% waste and assumes no settling loss. Its depth and allowances are illustrative; choose them for your plants, material and site. Do not add settling twice if your chosen depth already accounts for it.
Volume with allowances
1.1667 yd³
Whole 2 ft³ bags
16 bags
Bulk at 0.25 yd³ increments
1.25 yd³
Fixed teaching example, independent of your inputs above. Dimensions, allowances and order increments are illustrative. Calculations retain precision until final bag and bulk rounding; displayed volumes are rounded.
Turn volume into an order
A cubic yard contains 27 cubic feet, equivalent to 13.5 bags at 2 ft³ each before rounding. Round the total project bag count up once, rather than rounding each cubic yard separately. Check your bag size; this example assumes 2 ft³ bags.
Compare bags and bulk using your quote
Multiply whole bags by the price per bag. For bulk, multiply the rounded order quantity by the supplier’s price in matching units; convert to weight only with a product-appropriate density. Compare both options with their delivery or collection costs, minimum charges and taxes. Include handling, equipment and labor separately when relevant.
Enter actual quotes in the calculator above. A blank price is unknown, not zero, and a material subtotal is not a complete delivered cost.
Multiply the bed area by mulch depth and convert to cubic yards. Split irregular beds into non-overlapping sections and exclude uncovered areas. With feet and inches, use length × width × (depth ÷ 12) ÷ 27, then add a small waste allowance if you want extra for spreading.
How many bags are in a cubic yard of mulch?
A cubic yard is 27 cubic feet. At the calculator’s 2 ft³ bag size that is 13.5 bags before rounding. Round the whole project up once rather than rounding each cubic yard separately, and check the volume printed on your bag.
What depth should I use for garden beds?
Use the depth specified for your plants and product. The calculator’s 3-inch example is a teaching input, not a horticultural recommendation. If the depth you chose already allows for settling, leave the settling-loss field at zero.
Bags vs bulk — when to switch?
Bags are convenient for a few beds you can carry from the car. Bulk usually costs less per cubic yard and saves handling once the bag count becomes large. Compare both options with delivery or pickup charges using your quote.
Does mulch settle after I spread it?
Some products settle or decompose. This calculator treats settling as an optional percentage, separate from waste. Add it only when your entered depth describes the finished look and you still need extra material. Do not add settling twice.