Maximum decimal places: 2; Nearest, ties away from zero
Volume to order
4.32yd³ / 116.54ft³
Volume before extra
3m³
Weight
5.54t / 6.11US tons
Bags
234bags
Truck loads
1load
Order 3.3 m³ (4.32 yd³) of gravel, about 5.54 t. In 0.5 ft³ bags that is 234 bags, or 1 truck load.
Bed to fill
How it's calculated S
Volume
10×3×0.1=3m3
Add the extra
3×1.1=3.3m3=4.316237yd3
Weight
3.3m3×1,680kg/m3=5.544t
Loose bulk density from Engineering ToolBox; moisture can add 10–20%, so ask the supplier if you buy by weight.
Bags and loads
⌈0.01415843.3⌉=234bags,⌈7.645553.3⌉=1loads
Rounded up to whole bags and whole loads.
About the gravel calculator
Volume is length × width × depth, plus an allowance for settling and compaction. Weight is that volume times the material's loose bulk density; the material list uses 1,680 kg/m³ for dry gravel, 1,555 for dry sand, 1,280 for loam and 400 for wood chips. Bags and truck loads are the volume divided by the bag or truck size, rounded up.
The default 10 × 3 m path, 10 cm deep, holds 3 m³. With 10% extra that is 3.3 m³ (4.32 yd³), about 5.5 tonnes of gravel, or 234 bags of 0.5 ft³.
Suppliers sell by the cubic metre, cubic yard or tonne. Density changes with stone size and moisture, so when you pay by weight, enter the supplier's figure under Other (enter density).
How much gravel do I need?
Multiply length × width × depth, all in one unit, add an allowance for compaction, then multiply by the material's bulk density for weight. A 40 × 12 ft driveway 4 in deep holds 160 ft³ (5.93 yd³); with 10% extra that is 6.52 yd³, about 8.37 t or 9.23 US tons of gravel.
Gravel volume and weight, step by step
Put the depth in the same unit as the area: 4 in ÷ 12 = ⅓ ft.
Multiply the three dimensions: 40 × 12 × ⅓ = 160 ft³.
Convert to cubic yards: 160 ÷ 27 = 5.93 yd³.
Add the allowance: 5.93 × 1.10 = 6.52 yd³, which is 4.98 m³.
Multiply by the bulk density: 4.984 m³ × 1,680 kg/m³ = 8,373 kg, or 8.37 t.
In metric, a 10 × 3 m path 10 cm deep is 10 × 3 × 0.10 = 3 m³, or 3.3 m³ with 10% extra. A cubic yard is exactly 0.764554857984 m³.
Depth, allowance and density
Typical depths are 10–15 cm (4–6 in) for driveway gravel and 5–8 cm (2–3 in) for mulch. Gravel compacts and mulch settles, so an allowance of 5–15% is typical.
Wood chips weigh 20–30 lb/ft³ in the Engineering ToolBox product table; the midpoint, 25 lb/ft³, is about 400 kg/m³. Wet material weighs more, so when you pay by weight, use your supplier's density.
A metric ton (t) is 1,000 kg and a US short ton is 2,000 lb, or 907.18474 kg. One metric ton is 1.1023 short tons, so check which "ton" a quote uses.
Bags and truck loads
Bags are counted by volume, so divide the volume to order by the volume printed on the bag and round up. The 3.3 m³ path takes 234 bags of 0.5 ft³, 59 bags of 2 ft³ or 66 bags of 50 L.
Truck loads work the same way on the truck's volume. A dense material can reach the truck's weight limit before its body is full, so confirm the payload with the supplier.
Volume, weight and bags for five jobs
"Default" is the 10 × 3 m gravel path, 10 cm deep, with 10% extra and 0.5 ft³ bags. "No settling allowance" removes the extra, and "Mulch" swaps in wood chips. "One cubic yard" is 9 × 3 ft of topsoil 1 ft deep with no extra, in 0.75 ft³ bags.
"Custom imperial density" is a 4 × 2 m area, 5 cm deep, with no extra, a supplier density of 100 lb/ft³ (1,601.85 kg/m³) and 40 L bags.
Scenario
Order volume, m³
Weight, metric tonnes
Bags
Default
3.300000
5.544000
234.000000
No settling allowance
3.000000
5.040000
212.000000
Mulch
3.300000
1.320000
234.000000
One cubic yard
0.764555
0.978630
36.000000
Custom imperial density
0.400000
0.640739
10.000000
Mulch fills the same 234 bags as gravel but weighs less than a quarter as much, because bags and volume ignore density.
Mistakes that skew a gravel order
Leaving the depth in centimeters or inches. 10 × 3 × 10 gives 300 instead of 3 m³, a hundred times too much; inches left unconverted overstate a job measured in feet twelve times.
Using the density of solid stone. Bulk density includes the air between the stones, so a solid-rock figure overstates the weight of the same volume.
Counting bags by weight. A bag labeled only in pounds or kilograms needs the material's density to convert it to volume before you can count bags.
Adding the allowance twice. If the depth you measured is already the loose depth to be spread, extra on top of it counts the compaction twice.
Inputs worth a second look
Length, width and depth each take their own unit, and depth can be up to 5 m.
A custom density can be in kg/m³, lb/ft³ or g/cm³.
Bag size is a volume in ft³, liters or m³; truck capacity is in yd³ or m³.
Multiply length × width × depth to get volume, then add an allowance for compaction; this calculator adds 10% by default. A 10 × 3 m area 10 cm deep is 3 m³, or 3.3 m³ with the extra. In feet, divide cubic feet by 27 to get cubic yards: 20 × 5 ft at 3 in deep is 25 ft³, or 0.93 yd³.
How much does a cubic yard of gravel weigh?
About 1.28 tonnes (1.42 US tons) at the 1,680 kg/m³ this calculator uses for dry gravel, because a cubic yard is exactly 0.764554857984 m³. At the same density a cubic metre weighs 1.68 t. Dry sand at 1,555 kg/m³ comes to 1.19 t per cubic yard and loam at 1,280 kg/m³ to 0.98 t; wet material weighs more.
How many bags of gravel make a cubic yard?
54 bags of 0.5 ft³, because a cubic yard is 27 ft³. Bags of 2 ft³ take 13.5 per cubic yard, and 50 L bags take 15.3, since a cubic yard is 764.6 L. For a whole job, divide the volume to order by the bag size and round up, as the Bags result does.
How much area does a cubic yard of mulch cover?
108 ft² at 3 in deep, 162 ft² at 2 in and 324 ft² at 1 in, because a cubic yard is 27 ft³ and coverage is volume divided by depth. In metric, 1 m³ covers 20 m² at 5 cm and 10 m² at 10 cm. Add the settling allowance on top when ordering.
This calculator includes 4 worked examples with independently sourced answers. They run in the test suite, and you can run them here too.
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