Use this calculator to estimate the amount of gravel or aggregate you might require for your driveway, path or other construction project. Show
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Gravel is commonly used for outdoor landscaping projects such as yards, driveways and paths. It can also be used in the composition of concrete. Whatever your project, use our gravel calculator to assess the amount of gravel or aggregate you might need for your project. How much gravel do I need?To calculate how much gravel you might need for your project, measure the length and width of your area and multiply it by the depth of gravel required. This assumes that all measurements are in the same unit. If you have an odd-shaped area, break it down into rough rectangular or square shapes and calculate each area one at a time. You may wish to draw the shapes out on a sheet of paper to help you. Let's go through each step.
Example calculationIf we want to find out how much gravel we need for an area 15ft long by 20ft wide, with a gravel depth of 3 inches. Our calculation might look something like this:
Converting cubic yards to weight can be tricky, which is why we've put together an article about how much a cubic yard weighs. How to calculate gravel volumeYou can calculate gravel volume in cubic yards using the following formula: Gravel volume (yd³) = Area (ft³) × Depth (inches/12) ÷ 27 This assumes that you have already calculated your square footage area. Due to the fact that quantities of gravel are commonly expressed in weight, we need to do a further conversion in order to get a weight in tons. How to calculate the weight of gravel requiredTo define the necessary weight of gravel, you will need to take into account the density of the gravel, which commonly ranges from 1.4 to 1.7 tons / cubic yard, depending on the nature of the rock that composes it. To calculate the weight of gravel required, we can use the following formula: Gravel in US tons: Volume (yd³) × Density (tons/yd³) If you're planning for a construction project, it's worth considering the idea of adding an extra percentage of materials to allow for any changes of plan or any losses during the construction phase. Why is it important to use the right amount of gravel?The answer is simple, and it's a question of hold and durability! If too little gravel is used, the passage of pedestrians and vehicles can create ruts. The surface will be quickly stripped, and it will look unsightly with bare patches. Of course, using too much gravel can have its drawbacks too. It adds further expense to the project and can make the ground feel uncomfortable when walked on. When making concrete, it is crucial as successful concrete is correctly dosed in cement, sand and gravel. If any of the constituents are in deficit or excess, the concrete will be weakened. The right amount of gravel is essential for a beautiful driveway or a lovely gravel terrace, but don't worry; you can use our gravel calculator to help you work out how much gravel you need. Calculator created by Alastair Hazell Density figures for gravel, rock and sand are referenced from simetric.co.uk. Use this online gravel calculator to estimate how much gravel in volume (cubic ft, cubic yards, or cubic meters) or weight (tons & pounds, tonnes and kilograms). It uses a standard pea gravel density. Quick navigation:
Calculating how much gravel you needMany builders and gardeners face the task of calculating or estimating the amount of gravel they would need to fill a given space or cover a given area with a layer of gravel. Our gravel calculator is a great assistance in such cases, keeping in mind that the results will only be as good as the entered measurements and density. The process is as follows:
It is often a good idea to consider buying 5-6% more gravel than estimated by our calculator, to be on the safe side. Square or rectangular areaTo calculate how much gravel you need to cover a rectangular area you need to multiply the volume by the gravel density. The volume formula for a rectangular (or square) box in cubic feet is height(ft) x width(ft) x length(ft), as seen in the figure below: For example, to fill a box with a width of 3ft and a length of 6ft, to a depth of 1ft, you need to multiply 1ft x 3ft x 6ft = 24ft3 (cubic feet) of gravel, then multiply that by the density. Our pea gravel calculator handles all this for you given you supply the dimensions. Round area covered with gravelIf the area you want to cover with gravel, or the shape you want to fill is round, the calculation is a bit different: The volume of a figure with a round foundation is its height times the area of its foundation. To calculate the foundation area the calculator needs its diameter, since the formula is π x r2, where r is the radius, or diameter/2. Again, the gravel calculator will do this math for you. Irregularly shaped areaIn case the area you are calculating has an irregular shape, things get a bit more difficult, but in general what you would want to do is divide it in several regularly-shaped sections, calculate their volume and gravel requirements and then sum them up together. The one-click copy function of our tool should come in handy. In case you end up with a large number of sections to sum, you might appreciate our summation calculator. Gravel basics and gravel densityGravel is a naturally occurring material, consisting of water-born pieces of rock and is found in buried or current stream beds. The peas are usually rounded with smooth surfaces, while other properties depend on "parent rock". You may also encounter "crushed gravel", which is simply larger gravel particles crushed to a smaller desired size. Gravel is usually sold with a guaranteed maximum particle size, e.g. 10mm, 20mm. This means that no side of any particle will be larger than the specified measurement, which is achieved through screening, usually using industrial automated screeners. Note that a gravel's density depends on this, so make sure to consult the manufacturer's technical specifications for the estimated density which you should then input in our gravel calculator. Typical gravel density (dry) is between 1520 and 1680 kg/m3 (95 to 105 lbs/ft3). If it is mixed with sand the density is around 1920 kg/m3 or 120 lbs/ft3 [1]. Crushed stone is often used as a material for producing concrete. It is also used as a road base, and in some locations it is used for paving roads, for example Russia has over 400,000 km (250,000 mi) of gravel roads. It is a great driveway base material, bike path base fill, paver patio sub base, walkways, and just general fill material. Some types of gravel offer excellent drainage as water is able to percolate through the stones leaving your property or walkway clean and dry. Common gravel and crushed stone sizesContrary to what you may think, there is more than one type of gravel, both by composition and size of the stones. Selecting the right size and style is crucial for the success of any construction project, as some are more versatile and have a different application than others. For example, landscaping gravel would last longer than mulch or pine straw, making it great for outdoor spaces requiring a durable material, while construction gravel provides solid footing for construction and landscaping. Different types of gravel have different densities and by knowing it you can get a more accurate estimate for the amount of gravel you need. Gravel is categorized in two main types under the Udden-Wentworth scale: granular gravel (2 to 4 mm / 0.079 to 0.157 inches) and pebble gravel (5 to 64 mm or 02 to 2.5 inches). It is further categorized in several types, listed in the table below [2]: Gravel (crushed stone) types [2]For small projects, you can buy pea gravel in small bags, but for larger projects, you would need to buy by the cubic yard or by the ton (cubic meter or tonne). You’ll need to reach out to a landscaping supplier to purchase this quantity, making sure you also ask about transportation costs. Our tool allows you to enter price per ton (or tonne) to get a price estimate as well.
What is the density of gravel?The density of typical gravel is 105 lb/ft3 (1680 kg/m3). This corresponds to gravel with average sized pebbles and is the number used in the calculator. How much does a yard3 of gravel weigh?A cubic yard of typical gravel weighs about 2830 pounds or 1.42 tons. A square yard of gravel with a depth of 2 in (~5 cm) weighs about 157 pounds (~74 kg). The gravel is assumed to be clean of dirt and other debris. How much does a cubic meter of gravel weigh?A cubic meter of typical gravel weighs 1,680 kilograms 1.68 tonnes. A square meter of gravel with a depth of 5 cm weighs about 84 kg or 0.084 tonnes. The numbers are obtained using this gravel calculator. How much is a ton of gravel? A ton of gravel with average-sized pebbles is about 0.705 cubic yards, or 19 cubic feet, assuming it has been screened for debris and contains no leftover dirt, sand, etc.How much is a tonne of gravel?A tonne of moderately damp gravel typically fills about 0.595 m3 (cubic meters). It can be more or less dense depending on the size of the pebbles, the exact type of source rock, as well as purity. Ton vs tonne, tons vs tonnesWhen calculating the gravel weight, make sure you do not confuse the tonne (metric ton) with the ton (short ton). The first one is used by all countries in the world and is defined to be equal to 1000 kg by the international body of standardization. The ton is currently only used in the United States and is equal to 2000 pounds (2000 lbs). The difference between the two is not huge but can quickly add up to a significant number as the quantity increases. References[1] Nemati K.M. "Aggregates for Concrete" (2015) lecture for the University of Washington [online] Available at http://courses.washington.edu/cm425/aggregate.pdf [2] Wikipedia "Gravel" [online] Available at: https://en.wikipedia.org/wiki/Gravel How do you figure out how much crushed stone I need?Formula for Crushed Stone for a Project
In the construction world, most materials are measured in cubic yards. Multiply the length (L), in feet, by the width (W), in feet, by the height (H), in feet, and divide by 27. This number is how many cubic yards of crushed stone you need.
How do I calculate how much rock I need?Length in feet x Width in feet x Depth in feet (inches divided by 12). Take the total and divide by 21.6 (the amount of cubic feet in a ton). The final figure will be the estimated amount of tons required.
How many square feet does 1 ton crushed rock cover?Understanding Size and Coverage
Using 2 inches for the depth, the following measurements are a guide to the amount of gravel coverage per ton: 1/4 to 1/2 inch gravel, 100 square feet per ton; 1/2 to 1 inch gravel, 90 square feet per ton; and 1 1/2 to 2 inches gravel, 80 square feet per ton.
How do I calculate how much rock I need per square foot?Determining How Much Rock You Need
To calculate the amount of landscaping rocks you need in cubic yards, first measure the length and width of the area you're working with. Then, multiply those numbers by the desired depth of coverage in feet.
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