Gravel is measured as a volume and sold by weight, which is why every gravel calculation has a conversion in the middle of it and why two people measuring the same driveway can order loads that differ by a third. The volume is simple: area multiplied by depth, in consistent units. The conversion is where the judgement sits, because the weight of a cubic yard depends on the material, how well graded it is and how wet it is on the day.
Gravel volume calculator: volume first, in the units you measure in
Length by width gives the area; multiply by the depth in the same unit and divide to get cubic yards. A four inch depth is a third of a foot, and using inches straight into a yard calculation is the single most common arithmetic error in this job. Write the depth down before anything else, because it moves the answer more than the area does.
The gravel and sand calculator step: convert to what the supplier sells
A yard of dry aggregate is commonly reckoned at somewhere between one and a half tons, and a yard of sand a little more, but the number to use is the one your own supplier quotes for the specific material, because grading and moisture move it. Ask once, write it on your own price list, and use the same figure every time so your estimates stay comparable.
Base rock calculator: order for compaction and for the shape of the site
Base rock is placed loose and compacted, so an order equal to the finished volume leaves the job short. Add the compaction allowance your supplier states for the material, plus something for spillage and an uneven subgrade. A driveway measured neatly on paper is never neat on the ground.
Questions people ask about gravel calculator tons
How does an aggregate calculator work out tons from yards?
Multiply the cubic yards by the weight per yard for that material, taken from your supplier rather than from a generic table. Different aggregates and different moisture contents produce genuinely different numbers, and the supplier is the one who has to deliver it.
What depth should I put into a gravel amount calculator?
Take it from the specification or from what the use demands: a footpath, a driveway and a road base are not the same. Depth is the input with the most leverage on cost, so it is the one to confirm before quoting.
Should I order extra?
Yes, for compaction, spillage and an uneven subgrade. A short load means a second delivery charge and a crew waiting, which costs far more than the surplus, and surplus aggregate is rarely wasted on a working site.