Cubic Metres to Cubic Yards

How the cubic metres to cubic yards conversion works

A cubic metre (m³) is the SI unit of volume: a cube with edges of exactly one metre. A cubic yard (yd³) is the imperial equivalent: a cube with edges of one yard (0.9144 m). Because one yard is defined as exactly 0.9144 m, one cubic yard is exactly 0.9144³ = 0.764554857984 m³, and one cubic metre is exactly 1 ÷ 0.764554857984 = 1.30795 yd³ (to five significant figures).

The calculator multiplies the volume in cubic metres by 1.30795 to give cubic yards. It also shows cubic feet (one cubic yard = 27 cubic feet, so 1 m³ = 35.3147 ft³) and litres (1 m³ = 1,000 litres) as secondary outputs, since these appear in plant-hire schedules, concrete delivery notes, and tank-capacity specifications.

The exact conversion factor

The international yard was fixed at exactly 0.9144 m in 1959. Cubing that value gives 0.764554857984 m³ per cubic yard exactly. The reciprocal, 1 m³ = 1.307950619... yd³, is the factor used here. The calculator applies the full precision internally; the display rounds to two decimal places, so one cubic metre appears as 1.31 yd³. No approximation enters the arithmetic — rounding is in the display only.

What a cubic yard actually measures

A cubic yard is a cube 3 feet on each side (3 × 3 × 3 = 27 cubic feet). It is a large unit by everyday standards — one cubic yard of concrete weighs roughly 2.3 tonnes, and one cubic yard of loose topsoil typically weighs around 1.2 tonnes (both figures depend on mix and moisture). In UK construction the cubic metre is the standard unit for ordered quantities; cubic yards appear mainly on plant-hire charts derived from US equipment manufacturers, on older site records, and in imported technical literature.

Cubic metres, cubic yards, and cubic feet compared

One cubic metre = 1.30795 yd³ = 35.3147 ft³ = 1,000 litres. One cubic yard = 0.764555 m³ = 27 ft³ = 764.555 litres. The calculator shows all three imperial/metric and litre equivalents together, so a figure quoted in any one unit translates to the others without a second lookup.

Worked examples

1 m³ converts to 1.31 yd³ (35.31 ft³, 1,000 L). A 6 m³ ready-mix concrete delivery is 7.85 yd³ (211.89 ft³, 6,000 L). A 0.5 m³ load of ballast is 0.65 yd³ (17.66 ft³, 500 L). Each result follows directly from the factor 1.30795, with no intermediate rounding.

Where cubic yards appear in UK construction practice

Although UK concrete, aggregate, and excavation specifications are written in cubic metres, cubic yards remain relevant in several situations. Plant-hire catalogues for excavators, dumpers, and concrete trucks of US or Japanese origin often state bucket and drum capacities in cubic yards. Older British Standard tables and pre-metric site records express volumes in cubic yards. Groundworkers cross-referencing UK earthwork volumes with US-origin plant equipment encounter the unit routinely. Converting the specified m³ quantity into yd³ allows direct comparison with machine capacity without a separate manual calculation.

Concrete and aggregate ordering in the UK

Ready-mix concrete in the UK is ordered in cubic metres. A standard residential concrete pump truck typically delivers 6–8 m³ per load. Aggregate lorries are usually rated in tonnes, but volume equivalents in cubic metres and cubic yards appear on plant data sheets. Excavated spoil volumes on earthwork drawings are given in m³; skip and tipper capacities are frequently listed in cubic yards on hire schedules. Having both figures available avoids arithmetic on site.

Precision and rounding

The conversion factor is exact, so result precision is limited only by the volume entered and by sensible display rounding. The calculator shows cubic yards to two decimal places (to the nearest 0.01 yd³ ≈ 7.65 litres) and cubic feet to two decimal places. For concrete ordering, the meaningful resolution is 0.1 m³; two decimal places in cubic yards is therefore finer than batching precision, though useful for plant-capacity cross-checks.

Using this alongside other BuildMetricLab tools

Once a volume is confirmed in cubic metres, it feeds directly into density-based calculators — tonnes of aggregate or concrete, for example — using the cubic metres to tonnes converter. The metres to feet and inches calculator handles linear equivalents, and the square metres to square feet calculator handles area. All BuildMetricLab tools run entirely in the browser — no sign-up, no data sent anywhere, and the formula is shown on the page so the arithmetic can be audited.