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UK calculators/calculators/Gravel calculator UK
MATERIAL CALCULATOR

Gravel calculator UK.

Calculate decorative gravel in cubic metres, tonnes or bags. Compare your supplier’s bag price with a loose delivered load.

KEEP YOUR PLAN

Give your project a name.

Save your measurements and quotes on this device. No account needed.

My saved projects

YOUR MEASUREMENTS

Use the depth and allowance from your project specification.

Bag sizes, weight & pricing +

Bag counts and prices apply to the main material only. Enter your supplier’s density to calculate weight.

Compare bags with loose delivery +

Use the bag size and units above. Compare the same product at your supplier’s quoted prices. Enter small-bag or bulk-bag contents above and its price below. Include each delivery charge below. Use prices including VAT throughout.

Bulk-bag quote · optional third option

Compare small bags, bulk bags and a loose load side by side. Each price is optional; include delivery once for each option.

Minimum and increment use the bulk quote unit. For half-tonne orders, enter 0.5 as the increment. Zero uses the exact estimate. VAT is not added automatically. If delivery is included in a quote, enter zero for that charge. Check unloading and access separately. Weight quotes need your supplier’s bulk density.

Gouache illustration of a pale gravel path curving between leafy garden borders.
AI-generated illustration, not a photograph of a completed project.
BEFORE YOU ORDER

Getting a useful estimate

Use the finished fill depth, not the excavation depth. Gravel grading and moisture can change bulk weight.

Measure the space you need to fill. Rectangles use length and width; circles use diameter. For several sections, choose combined areas and add rectangles, then subtract exclusions. The final area must be greater than zero.

Measure the gravel layer

Enter the area to cover and the depth for your chosen gravel size. Subtract planted islands or other areas you are leaving uncovered. The calculator measures a gravel layer; it does not design the base beneath it.

For a driveway with a separate sub-base, use the Type 1 tool for that layer. Do not add its depth to the decorative gravel depth.

Gravelmaster: River Washed Gravel 10mmWickes: MOT Type 1 jumbo bag

Use the contents on the bag label

Gravelmaster’s River Washed Gravel 10mm is sold in 20 kg bags and approximately 850 kg or 1,000 kg bulk bags. Those are examples from one product, not presets for all gravel.

Ask for the loose bulk density of the gravel you intend to order. Stone size, grading and moisture affect weight. The calculator leaves density blank until you enter your supplier’s figure.

Gravelmaster: River Washed Gravel 10mm

Check the delivery quote

Compare the same gravel specification and size. Enter VAT-inclusive prices, each delivery charge and the loose-load minimum. Change the bag size to compare a small bag or a bulk bag.

Check whether the quote includes delivery to your postcode and whether the vehicle can unload where you need it. Bag counts round up; the comparison shows the extra material from rounding.

Gravelmaster: River Washed Gravel 10mmMarshalls: Paving installation and delivery FAQs

Volume formula

Volume = area × depth × (1 + allowance ÷ 100)

Allowance applies once to each volume layer. No density or compaction factor is assumed. If buying by weight, enter the density for your supplier’s product in the units shown.

Sources & what they cover

  • NIST SI conversion factorsNational Institute of Standards and Technology

    Exact US customary and SI conversion factors; no material or installation recommendations.

    Source checked
  • MOT Type 1 jumbo bagWickes

    Named sub-base product and 800 kg bag. Bag weight can vary with moisture. No universal density or construction depth imported.

    Source checked
  • River Washed Gravel 10mmGravelmaster

    Product-specific 20 kg bags and approximately 850 kg or 1,000 kg bulk bags, plus loose delivery. These sizes are not universal.

    Source checked
  • Paving installation and delivery FAQsMarshalls

    Different bedding systems for paving flags, joints, VAT and delivery access. No generic installation specification imported.

    Source checked

We check what each reference covers. A source check does not mean a specialist has reviewed this tool. You supply the depths, densities, prices and blend proportions.

Operated by Pete CallaghanUpdated Not yet independently reviewedHow we check our toolsReport a correction