Calculators
Work out how much sand, gravel, stone, concrete, mortar and soil a job takes, from any shape and in any unit.
Every calculator uses the figures from the guides, and each guide links to its calculator with its own figures filled in. Measure your job, type it in and order by weight where you can.
Gravel calculator
One layer of gravel, stone, sand or crushed stone: how much to order, how far it goes and how thick it ends up.
Base and layers calculator
A whole build-up, layer by layer: base, bedding, grid fill, concrete and the dig depth.
Concrete calculator
Slabs, footings, post holes, pads and columns: volume, cement, sand, stone and the largest stone you can use.
Mortar calculator
Bricks or blocks per wall and the cement, lime and sand for the mortar.
Render calculator
Sand, cement and lime for a rendered wall, coat by coat.
Screed calculator
Cement and sand for a floor screed of any thickness.
Paving sand calculator
Bedding sand, joint sand and the number of pavers or slabs.
Drainage calculator
Drainage trenches, drains behind walls, pipe bedding, soakaway size and the BRE 365 soil test.
Gabion calculator
Fill stone, bracing wires and the base for gabion walls, fences, benches and pillars.
Soil calculator
Topsoil, compost and mulch for lawns, beds, raised beds and trees, plus lawn levelling and a drainage test.
Steps and slopes calculator
How many steps a slope needs, rise and tread, and how steep a path may be.
Weight and volume converter
Tonnes, cubic metres, cubic yards, bags and coverage for any material.
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