How Much Stone Do You Need to Fill a Grave?

An average single Irish grave takes about six 25 kg bags of decorative stone at our recommended depth of 50 mm, and a double grave takes roughly twice that. For a thinner layer of around 30 mm, a single grave needs about four 25 kg bags, or four to five 20 kg bags if that is the size you are buying.

Treat these as starting figures. No two graves measure quite the same, so measure your own before you order anything. These four things change the amount you need:

• The size of the grave. Fingal County Council's bye-laws set a single surround at 2.74 m × 1.22 m, while Carlow County Council uses grave spaces of 2.4 m × 1.2 m.
• The headstone base, and any memorial slab, which take up some of the space inside the kerbs.
• The width of the kerbs or edging.
• The depth you choose. Going from 30 mm to 50 mm adds roughly two thirds more stone.

How much stone will I need for a single or double grave?

Cemetery plots are not the same everywhere. Clare County Council gives a single plot as 2.75 m by 1.25 m and a double as 2.75 m by 2.5 m. Glasnevin has different sizes in different sections. The area you fill is also smaller than the plot, because the kerbs and headstone base sit inside it. The table below uses example infill sizes. Every figure is rounded up to a whole bag.

Infill area (inside the kerbs)	Area	20 kg bags at 30 mm	25 kg bags at 30 mm	25 kg bags at 50 mm
Smaller single, 1.8 m × 0.75 m	1.35 m²	4	3	5
Larger single, 2 m × 0.9 m	1.8 m²	5	4	6
Double, 2 m × 1.8 m	3.6 m²	9	8	12
Full single plot with no kerb, 2.74 m × 1.22 m	3.34 m²	9	7	12

So how much will one bag cover? These are the figures we used, and they assume loose gravel at about 1,600 to 1,700 kg per cubic metre (the Engineering ToolBox puts dry gravel at 1,680 kg/m³):

• A 20 kg bag covers about 0.4 m² at 30 mm, or 0.25 m² at 50 mm.
• A 25 kg bag covers about 0.5 m² at 30 mm, or about 0.3 m² at 50 mm.

Once you have your figure, add about 10 per cent for uneven ground, settling and topping up later. A double grave at 30 mm then comes to about ten 20 kg bags.

How do I calculate the exact amount of stone for a grave?

Measure the inside length and width, from the inner face of one kerb to the inner face of the other. Leave out the headstone base, any memorial slab, flower containers and anything planted. Then use two simple sums:

1. Length in metres × width in metres = area in m².
2. Area ÷ coverage per bag = number of bags.

Take a 2 m × 0.9 m grave as an example. That's 1.8 m². Divide it by 0.4 m² per 20 kg bag and you get 4.5, which rounds up to five bags before the extra allowance. The logic is the same one the RHS uses for garden gravel, where volume is area multiplied by depth.

Real coverage isn't exact. The shape of the stone, its grading, how wet it is and its density all make a difference. Gravel's bulk density ranges from 1,460 to 1,920 kg/m³, so the same bag weight can cover noticeably more or less ground. Check the coverage stated on the product you choose, or enter your measurements in our Online Calculator.

What depth should I use for grave gravel or pebbles?

For decorative stone on a grave we generally recommend about 50 mm. A thinner layer of around 30 mm can work for small chippings over a level base with a membrane, and it uses fewer bags. A few things to keep in mind:

1. 50 mm suits larger pebbles, uneven ground, or a fuller look. Remember that it adds a lot of bags.
2. Too shallow and the membrane or soil shows through, and the stones get kicked about more easily.
3. Too deep isn't better either. The extra weight pushes against the kerbs, the stones move about more, and topping up gets harder over the years.

Which stones for graves are most suitable?

There's no single right answer. A lot depends on the headstone and on how much looking after you can realistically give the grave. This comparison covers the three main options.

Type	Stability	Look	Cleaning	Movement
Gravel	Good	Soft and natural	Easy to rake	Moderate
Angular chippings	Best, as the edges lock together	Crisp and sparkling	Easy to rake	Least
Smooth pebbles and glass	Lower	Polished and glossy	Easy to rinse	Most, as round stones roll

For general grave gravel, small to medium sizes are the most practical. Larger pebbles are usually chosen for how they look. Colour matters just as much. Our Carrara White Italian Marble Chippings, quarried in Carrara in Italy, stand out brightly against black granite. Scottish Grey sits quietly beside a light grey headstone. For a tonal match with black granite, choose Black Glass Pebbles, which are made from 100% post-consumer recycled glass and permanently dyed. One honest caution: pale stones show fallen leaves and staining sooner than darker ones.

A well-dressed grave gives you:

1. a neat, finished surface with no bare soil
2. much less weeding
3. room to work around plants and memorial ornaments

For more on choosing a colour, see our guide to the right stone, glass chippings or pebbles for a grave headstone.

Are decorative stones allowed in Irish cemeteries?

Often, yes, but the rules differ from one cemetery to the next, so check your own cemetery's rules with the cemetery office, parish, local authority or caretaker before you buy anything. A few examples show how much they vary:

1. In a lawn cemetery, Dún Laoghaire-Rathdown's bye-laws don't allow kerbs, and the plots are kept as grass, so check with the cemetery office before adding any stone.
2. Tipperary County Council may require kerbs to sit flush with the ground.
3. Dublin Cemeteries Trust lists chippings as not needing a permit, but you must still let the office know. In Glasnevin, kerbing is compulsory in some sections and not allowed in others.

Your cemetery may also have its own rules on glass, ornaments or who can carry out the work, so ask before you start. Think about the neighbours as well: the grass cutting, drainage, access paths, and keeping loose stones inside your own grave.

How do I prepare, edge and fill a grave with gravel?

1. Get permission, and confirm the dimensions you're allowed to work to.
2. Clear the weeds and any old material, then measure the inside area.
3. Level the surface, and repair or fit approved edging.
4. Lay a permeable membrane. The RHS advises laying landscape fabric first to stop weeds. Cut it neatly around the headstone base and any plants, and don't let it block drainage.
5. Spread the bags out evenly, then rake to your chosen depth. Keep stone off the inscription, the paths and the graves next door.
6. Hold back part of a bag if you can. Stone colours can vary from batch to batch, so keeping some makes topping up easier.

A 25 kg bag is heavier than it looks. Lift with your knees, carry one at a time, and protect the headstone from knocks. If the kerbs need resetting or there's any structural work, ask a monumental sculptor.

Frequently asked questions

Do I need a membrane underneath gravel on a grave?

We haven't found an Irish rule that requires one, but it helps a lot. The RHS notes that without landscape fabric, weeds and self-seeding plants may become a problem. A permeable membrane lets rain drain through, keeps the stone clean and stops it sinking into the soil.

How much does it cost to cover a grave with stone in Ireland?

It depends on the stone and the depth you choose. Polished cobbles and glass pebbles usually cost more than plain chippings. Work out your bag count with the table above, then check current prices and delivery costs on each product page. Delivery is calculated at checkout.

How do I keep grave pebbles clean and free from weeds?

Much of the work is done at the start: a good membrane and the right depth. After that:

1. Pick off leaves before they break down.
2. Pull any seedlings while they're small.
3. Rinse glass pebbles with plain water now and then.

Can I order a sample before buying?

Yes. Our sample bag service lets you see the colour beside the headstone before you commit to a larger order. It's worth doing, because stone looks different in an Irish graveyard on a wet day than it does on a screen.

Where can I buy the right amount of grave stone?

1. Measure the inside of the grave.
2. Choose your stone and depth.
3. Use the table or the formula above, and add about 10 per cent.
4. Check the bag weight, coverage, price and delivery on the product page.

You'll find the full range in our pebbles and chippings for graves. For plainer gravel, look at our garden stones, pebbles and chippings. We deliver throughout Ireland and Northern Ireland. If you'd like someone to check your figures, call us on 086 385 2359 or use live chat, and we'll help you work it out.