Metric
Concrete Calculator Uk
Start in metres and millimetres. The order is in cubic metres, with yards and bags still available if a supplier thinks in both.
Your region
Metres, millimetres, cubic metres, and 20/25 kg bags
Concrete Calculator
Example measurements — replace them with yours.
Common sizes
Most orders add 5–10% for spillage, uneven ground, and the last bit left in the chute.
Cost, truck size, and concrete weight
Leave a price blank to skip that estimate. Use the number your supplier quoted.
This job
Add each pour — slab, piers, steps — and Concrete Calculator totals them.
Quick answer
Concrete Calculator Uk: volume in m³ = length × width × thickness in metres. A 4 × 3 m slab at 100 mm is 1.2 m³. One cubic metre ≈ 1.308 yd³ ≈ 35.3 ft³. Normal concrete ≈ 2,400 kg/m³.
Concrete Calculator Uk: UK, Australia, and dual tickets
Searchers for concrete calculator UK or Australia usually want metres and kilograms, sometimes 20 kg or 25 kg bags. Concrete Calculator keeps yards beside m³ when a supplier still quotes imperial. Confirm bag yields on the local brand — metric bag counts are scaled from the US 80 lb / 0.60 ft³ planning yield unless you adjust.
Worked example
5.0 × 2.5 m patio at 100 mm = 1.25 m³. At 2,400 kg/m³ that is 3,000 kg. In yards: 1.25 × 1.308 ≈ 1.64 yd³ before waste. Add 10% → about 1.80 yd³ if an imperial plant is supplying.
Concrete calculator UK and Australia workflows
Work entirely in metres and millimetres: 4.000 × 3.000 × 0.100 = 1.200 m³. Bag sizes of 20 kg and 25 kg are common outside the US; treat Concrete Calculator’s metric bag line as a planning estimate and confirm the local brand’s yield. Plants may still quote in m³ with a strength class (C20/25, etc.).
Cubic yards to cubic meters: multiply yd³ by 0.7646. Cubic meters to yards: multiply by 1.3079. Keep both on screen when a US-owned plant is supplying a metric drawing — or the reverse.
Square metres to cubic metres
Area in m² × thickness in metres = m³. A 25 m² patio at 100 mm is 2.5 m³ before waste. That is the square meter to cubic meters concrete calculator path without a separate tool.
Bag yields outside the US
Twenty-kilogram and twenty-five-kilogram bags do not share the US 80 lb yield chart. Use Concrete Calculator’s metric bag line as a planning hint, then read the local bag’s litres or m³ coverage. Ready-mix in m³ still uses length × width × thickness in metres with waste on top.
Canada often mixes metric drawings with imperial plant habits. Keep both unit systems visible so the ticket and the tape measure agree.
Related tools
Mix ratio after you know m³ · Weight for kilograms · Volume for formula detail.
Before you call the plant
Write the neat volume, the waste percent, and the rounded order on one line. Dispatchers prefer a single clear quantity over a story about how you measured the forms.
If a drawing sets thickness, cover, or mix strength, those details override any online default. This page is for planning quantity — not for designing the section.
Frequently asked questions
How do I calculate concrete in m³?
Multiply metres: 4 × 3 × 0.1 = 1.2 m³.
m³ to yd³?
1 m³ ≈ 1.308 yd³. 1 yd³ ≈ 0.765 m³.
UK or Australia?
Same SI math. Confirm bag yields locally.
100 mm in metres?
0.1 m. 150 mm = 0.15 m.