Limestone Calculator

Turn an area and a depth into the limestone volume, weight and cost.

Six rock densities, a wastage allowance, metric and imperial units, and twenty currencies.

Updated October 22, 2026

CreatorFrank Zhao

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What this page answers

Limestone is bought by weight and spread by depth, and those two figures are the whole problem: you measure a hole in the ground, the quarry sells you a lorry load. This page turns one into the other. Give it the area you are covering and the thickness of the layer, say which limestone you are buying, and you get the volume to order, the weight that volume becomes, and the cost at whatever price your supplier quoted.

It is built for the jobs where limestone is the loose material rather than a cut slab: a drive or a parking bay, a garden path, a courtyard or a shed base, the surround of a raised bed, or a drainage area being filled with clean crushed stone. It is equally useful the other way round — when a load has already arrived and you want to know how far it will go, or when a quote gives you the price per cubic yard and you think in tonnes.

6 rows

loose, crushed and solid limestone

1,540–2,690

kg per m³ between the lightest and heaviest row

the wastage allowance the page opens with

Two numbers decide the answer, and neither is geometry

The density tells the page how heavy a cubic metre of your stone is, and the wastage allowance tells it how much extra you expect to lose. Everything else is multiplication. Both are yours to set: the density row is filled from the limestone you choose, and the allowance starts at 5% but is yours to change. The calculation never quietly rewrites either of them.

How to use it

Five entries are enough for a complete answer. You do not have to fill in the price boxes at all if you only want quantities.

Pick the limestone you are buying

The rows describe the stone as it is delivered, from a loose 1,540 kg/m³ pile up to a solid 2,690 kg/m³ block. Choosing a row fills in the average density for you and keeps it fixed. If your supplier quotes a density of their own, choose the last row, Enter custom limestone density, and type it into the density box that follows.

Give the size of the area

Enter a length and a width, or skip both and type the area straight in — the page treats them as the same measurement seen two ways, so whatever you fill last is the one it believes. For an odd shape, measure it in pieces and add the areas; the square footage calculator can total a rectangle for you first.

Enter the depth of the finished layer

This is the thickness you want to see once the stone is spread and raked, not the height of the pile. Ten centimetres is a common finished depth for a garden path; if vehicles will use the surface, the depth normally comes from the build-up design rather than from this page. Depth can be typed in millimetres, centimetres, inches or feet.

Set your wastage allowance

Five percent is a reasonable opening figure for spillage, uneven spreading and the trimmed edges. If you are barrowing the stone through the house or filling awkward corners by hand, allow a little more. The box accepts anything from 0% to 30%.

Add a price if you want a cost

Give the price per unit of weight or the price per unit of volume, whichever your supplier states — the other fills itself in. The total cost is the weight needed multiplied by the price, and it appears in the currency you chose for the money boxes.

A path in one pass

A garden path is 3 m long and 4 m wide and wants a 10 cm layer. You are buying medium-density limestone at 2,410 kg/m³ for 50 per metric ton, and you leave the allowance at 5%.

The arithmetic

A = 3 \times 4

=

12\ \mathrm{m^2}

V = 12 \times 0.10

=

1.2\ \mathrm{m^3}

V_{\mathrm{need}} = 1.2 \times 1.05

=

1.26\ \mathrm{m^3}

W = 1.26 \times 2{,}410

=

3{,}036.6\ \mathrm{kg}

=

3.0366\ \mathrm{t}

C = 3.0366 \times 50

=

151.83

So the order is about 1.26 m³, or 3.04 metric tons, and the stone alone costs roughly 151.83 in the unit you priced it in. Note which figure you would read out: a supplier normally quotes and charges by weight, while the person spreading the stone works in volume. Both boxes are filled for exactly that reason.

Reading the answers

The boxes that go blue are the ones the page has worked out from the others; the ones you can still edit are the ones you own. The density and the wastage allowance never turn blue — they are your assumptions, and if you change one of them the page recalculates the rest around it rather than editing the assumption back.

How the numbers are built

Six statements run in a chain. Each one has one figure on the left and its factors on the right, so every one of them can be solved in either direction.

A = L \times W

Area of the bed

Length times width. If you typed the area instead, the page backs out whichever side is missing.

V = A \times d

Volume of the bed

The area times the depth. Enter any two of the three and the third follows, which is how you find the depth a given volume will produce.

V_{\mathrm{need}} = V \times (1 + w)

Volume to buy

The volume of the bed plus the wastage allowance $w$ , written as a fraction: 5% is 0.05.

W = V_{\mathrm{need}} \times \rho

Weight to buy

The volume to buy times the density $\rho$ . This is the figure a supplier and a weighbridge care about.

p_V = p_m \times \rho

Price per volume from price per weight

A price per cubic metre and a price per tonne are the same price seen through the density, which is why either box fills the other.

C = W \times p_m

Total cost

The weight to buy times the price per unit of weight. The total is reached through the weight and the price, never through a second, parallel rule that could disagree with them.

The allowance goes on the volume, before the density

The order matters. Five percent more volume is five percent more weight, so the two figures always climb together:

1.05\ \mathrm{m^3} \times 1{,}960\ \mathrm{kg/m^3}

=

2{,}058\ \mathrm{kg}

=

2.058\ \mathrm{t}

It also means the allowance is inside the weight you receive. That is why the coverage figure in the first worked example is smaller than a plain division of the load by the depth would suggest — part of the load is the spare, not the layer.

Everything is reversible except the two assumptions

Because the chain runs both ways, you can start anywhere. Type an area and a depth and read the weight; type the weight and read the volume, the area or the depth it will cover; type a total budget and read the price per tonne or the weight it buys; type a price per cubic yard and read the price per tonne.

The density and the allowance are the exceptions, and deliberately so. A density belongs to the stone you chose, and an allowance is a decision about the job; if the arithmetic were allowed to solve for either, a number you set on purpose could change to make the sum come out. Instead, the page keeps them and moves one of the measured boxes instead.

Units and currencies are normalised first

Lengths, areas, volumes, weights and densities are converted into one common unit before they multiply, so a path in feet and inches and a price in pounds per short ton give an answer consistent with the metric version of the same job. The money boxes work the same way: a price entered in any of the listed currencies is converted at a daily rate, and the total is shown back in the currency of its own box.

Which density to pick

The density is the single biggest lever on the answer. The same cubic metre is a little over 1.5 tonnes of loose stone and nearly 2.7 tonnes of solid stone, and the weight that reaches your total is the one you chose.

Row	Density (kg/m³)	One cubic metre (t)	One cubic yard (t)
Low-density limestone	1,960	1.96	1.50
Medium-density limestone	2,410	2.41	1.84
High-density limestone	2,650	2.65	2.03
Crushed limestone	2,240	2.24	1.71
Loose limestone	1,540	1.54	1.18
Solid limestone	2,690	2.69	2.06

A cubic yard is 0.7646 m³, which is the whole conversion behind the last column — helpful when a quote arrives per yard and every other number you have is metric.

1\ \mathrm{yd^3} = 0.7646\ \mathrm{m^3}

The two ends of that table are the same material handled differently. Solid limestone is one block for the whole cubic metre; crushed and loose stone are pieces with air between them, so the same box holds less stone and therefore less mass. Nothing is wrong with either row — they answer different questions about what a cubic metre means on your drive.

If the supplier states a density, use it

A delivery note, a data sheet or a quarry’s own figure beats any row here. Choose Enter custom limestone density, then type the value in kg per cubic metre. The page keeps the number you typed and warns you, without hiding it, if it has landed outside the range real limestone sits in — the usual cause is a specific gravity such as 2.41 typed as a density, where 2,410 was meant.

Comparing limestone with another loose material for the same job? The gravel calculator carries its own table of bulk densities for pea gravel, crushed stone and other aggregates, which makes the two a fair comparison at the same volume.

Worked examples

Three situations that come up after the first answer: how far a load goes, how deep it settles on a fixed area, and whether two different quotes are really the same money.

How far one US short ton goes

Situation: A trailer-load is sold as one US short ton of low-density limestone and you want a 4 in layer. How much ground will it cover?

Entered

Limestone typeLow-density limestone (1,960 kg/m³)

Weight needed1 US ton

Depth4 in

Wastage5%

Result

V_{\mathrm{need}} = \frac{907.18\ \mathrm{kg}}{1{,}960\ \mathrm{kg/m^3}}

=

0.4628\ \mathrm{m^3}

V = \frac{0.4628}{1.05}

=

0.4408\ \mathrm{m^3}

A = \frac{0.4408}{0.1016}

=

4.34\ \mathrm{m^2}

About 4.34 m² — roughly 47 square feet. With the allowance set to 0% the same ton would cover 4.56 m², because the whole load would be layer and none of it spare.

In practice: For a path one metre wide that is a little over four metres of run, so measure the length you actually have before the first load is ordered.

How deep a five-tonne load lands

Situation: A 30 m² parking bay is prepared and five metric tons of crushed limestone are on the way. How deep will it sit?

Entered

Area30 m²

Weight needed5 t

Wastage5%

Limestone typeCrushed limestone (2,240 kg/m³)

Result

V_{\mathrm{need}} = \frac{5{,}000\ \mathrm{kg}}{2{,}240\ \mathrm{kg/m^3}}

=

2.2321\ \mathrm{m^3}

V = \frac{2.2321}{1.05}

=

2.1258\ \mathrm{m^3}

d = \frac{2.1258}{30}

=

0.0709\ \mathrm{m} = 7.1\ \mathrm{cm}

About 7 cm of finished layer, with a further 0.11 m³ of stone held back as the allowance. At 10 cm the same 30 m² would need 7.06 t, so this load is roughly 40% short — the page puts the requirement in the weight box as soon as the area and the depth are both filled in.

In practice: Spread a test strip and measure it before the rest goes down: if the delivered stone is wetter than the table assumes, the same weight will sit slightly shallower.

A price per tonne against a price per cubic yard

Situation: One supplier quotes 50 per metric ton of low-density limestone; another quotes 75 per cubic yard for the same stone. Which is cheaper?

Entered

Limestone typeLow-density limestone (1,960 kg/m³)

Price per unit of weight50 per metric ton

Price per unit of volume75 per cubic yard

Result

p_V = 50 \times \frac{1{,}960}{1{,}000}

=

98\ \text{per m}^3

98 \times 0.7646

=

74.93\ \text{per cubic yard}

They are the same money: 75 per cubic yard is 98.10 per cubic metre, which works back to 50.05 per metric ton. Change the rock row, though, and the two quotes part company — at 2,690 kg/m³ (solid limestone) the 75 per cubic yard quote is only 36.47 per metric ton, because a cubic yard of it is far heavier. A per-volume price and a per-weight price can only be compared once you know which stone is in the yard.

In practice: Ask every supplier for the basis they price on, enter it in the matching box, and compare the two price boxes the page fills for you rather than the headlines.

If the second supplier states a density in kilograms per cubic metre and you would rather see the raw conversion between cubic yards and metric tons, the cubic yards to tons converter does that step on its own.

Measured and ordered well

Measure the layer, not the pile

Depth is the thickness of the finished surface. If you plan to compact the stone or roll a vehicle over it before it settles, check the layer after the first loads are spread: this page has no compaction step, so the depth you type is the depth you get when the stone is simply spread and raked level.

Take the density off the paperwork

The row names are descriptions, not specifications. If the quarry’s sheet says 2,340 kg/m³, use the custom row and type it; the weight you calculate will then match the weight you are charged for, which is the only way the cost estimate can be trusted.

Put both prices in, not just one

A quote per ton and a quote per cubic yard look comparable and are not. Fill the two price boxes and the page converts both into the same basis, so the cheaper supplier is obvious before delivery charges are added.

Keep the allowance modest

The allowance is a contingency, not a second order. The 5% the page opens with covers spillage and trimmed edges for straightforward spreading; step up to about 10% when the stone has to be barrowed to the far side of a house or worked into awkward shapes. If you find yourself needing more than a third extra, the odds are the measurement, not the allowance, is what needs another look.

Wet stone is heavier for the same volume

Rainwater fills the gaps between the pieces, so a load weighed after a wet week carries more mass in the same cubic metre than the dry table figure. That does not change what you need — it changes what the weighbridge says. Judging the delivery by volume is the more stable check.

Questions

How much does a cubic yard of limestone weigh?

Across the six rows on this page, one cubic yard (0.7646 m³) weighs between about 1.18 and 2.06 metric tons — 1,177 kg for loose limestone at 1,540 kg/m³ and 2,057 kg for solid limestone at 2,690 kg/m³. In US short tons that is roughly 1.30 to 2.27.

The spread is not an error: it is the difference between a cubic yard of loose pieces with air in it and a cubic yard of solid stone. If the supplier gives a density, use the custom row rather than picking the nearest name.

Can I start from a budget instead of a price?

Yes. Type the amount you are willing to spend into the total cost box and the page works backwards: it can give you the weight that budget buys at the price you entered, or the price per unit of weight it implies for the quantity you need. It needs one of the other two to be filled in first, since a budget on its own says nothing about how much stone it buys.

Why does the density box lock when I choose a rock?

Because that number belongs to the stone you picked, not to the job. Locking it means the arithmetic can never nudge a tabulated density to make the equation balance, so the weight you are quoted is always the weight for the rock you chose. Choose Enter custom limestone density to type your own figure and the box opens again.

Why is the wastage allowance capped at 30%?

Beyond about a third, an allowance stops describing spillage and starts describing a different job — an area measured too small, a depth measured too shallow, or a sub-base that will swallow the first layer. The page keeps the number and flags it rather than deleting it, so you can see what you entered while you decide which of those it is.

How far the answer goes

This is an ordering estimate, not a survey or a specification. It multiplies three dimensions by a density you chose; it cannot know what is under the layer or how well the stone will settle.
The model is a level rectangular layer of even depth. Slopes, curved edges, a thin feather edge along a path and a thicker apron at a driveway entrance are all outside it — divide an irregular job into rectangles, or into sections of different depth, and add the answers.
There is no compaction, sub-base or geotextile step. If the layer sits on a prepared base, or is being compacted as part of a driveway build-up, the quantity comes from that specification, not from this page.
The density rows are typical figures for the material as delivered. Grading, moisture and how the stone was loaded all move the real number, which is why the custom row exists and why a delivery note beats any row here.
The cost is the stone alone, at the price you type. Delivery, minimum-load charges, taxes, bagging and quarry surcharges are not included, and currency conversion follows a daily rate rather than the rate on your invoice.
Where the stone is part of a working system — a drainage trench, a retaining structure or anything load-bearing — the layer thickness and the stone grading should come from the design, and a qualified professional’s specification takes precedence over this estimate.

Check the two figures that matter most against reality before the order goes in: the density on the supplier’s sheet, and the depth you actually want once the stone is spread. Those two move the weight far more than any other entry on the page.

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