Work out exactly how much material you need.
CubicMath is a set of free material calculators built on one rule: use measured, published densities, never guesses. Area × depth × real density — so the quantity you order is the quantity the job needs.
Construction & landscaping
- Asphalt Calculator
Tons of hot mix asphalt from length, width and compacted thickness.
- Cubic Yard Calculator
Length × width × depth to cubic yards, with real material weights.
- Gravel Calculator
Tons and cubic yards of gravel, loose or compacted, from area and depth.
- Brick Calculator
Brick count from wall size and format, per BIA published quantities.
- Board Foot Calculator
Board feet and cost from lumber size and count, nominal rules included.
- Cubic Feet Calculator
Any dimensions to cubic feet, with exact litre, gallon and yard conversions.
- MOT Type 1 Calculator
Tonnes and bulk bags of Type 1 sub-base from area and depth (UK).
- Tarmac Calculator
Tonnes of tarmac from area and depth in metres and millimetres (UK).
- Fence Calculator
Posts, panels, pickets, rails and concrete bags from fence length.
- Topsoil Calculator
Cubic metres, tonnes and bulk bags of topsoil from area and depth.
- Aggregate Calculator
Tonnes and bulk bags of any aggregate from area, depth and material.
- Block Paving Calculator
Paving blocks, sharp sand and jointing sand from area and block size.
- Sand Calculator
Tons, cubic yards and 50 lb bags of sand — dry, damp or compacted.
- Turf Calculator
Rolls of turf from lawn size, with cutting allowance and pallet weight.
Tiling & finishing
- Grout Calculator
Pounds, kilos and bags of tile grout from tile size, joint and area.
- Screed Calculator
Tonnes of floor screed, with the BS 8204 thickness check and drying time.
Money & tax
- Reverse Sales Tax Calculator
Take the tax out of a total — pre-tax price and tax amount by division.
Guides
The reasoning behind the numbers — how the materials behave, what the trade figures mean, and the traps that make orders come up short.
- How much does a yard of gravel weigh?
Yard-to-ton conversions for gravel and crushed stone, loose and compacted.
- How to build a gravel driveway
The layer system, compaction, crown and drainage — with tonnage per layer.
- How much does gravel cost?
The four things that set the price, and how to compare per-ton and per-yard quotes.
- How many cubic feet in a cubic yard?
Twenty-seven, and what that means for mulch bags, dump trucks and dirt weight.
- How much does a yard of sand weigh?
Dry, damp and compacted sand weights, bag counts and ton conversions.
- How much topsoil do I need?
Area × depth ÷ 324, with depth guidance for lawns, topdressing and raised beds.
- What is a board foot?
144 cubic inches — plus why 4/4, 5/4 and a 2×4 are not the sizes they measure.
- How to build a fence
Post spacing, hole depth, concrete per post, and the post-count off-by-one.
- What is asphalt?
What it's made of, what it weighs, and why it cools rather than dries.
- How to lay a patio
Sub-base, bedding and fall — full mortar bed for slabs, screeded sand for blocks.
- How to lay turf
Ground preparation, brickwork laying pattern, watering and the first mow.
- What is screed?
How it differs from concrete, BS 8204 minimum thicknesses, and drying times.
Why trust these numbers?
Most material calculators online use a single made-up density for everything. Ours cite their sources: hot mix asphalt at 142–148 lb/ft³ per the Asphalt Institute, crushed stone at 2,850–3,700 lb per cubic yard per the Washington State DOT design manual, and so on. Every figure is published with its source quoted on thematerial density reference — see theabout pagefor how we work.