Concrete Calculator by Rechnerzentrale

Element

Area

m²

Layer thickness

Bag size25 kg bags · yield – l

Bag weight

Yield per bag

Litres of fresh concrete per bag – printed on the bag. Leave empty: bag count approximated from the weight

Your price per bag

€

Optional, from your quote

Your price per m³ ready-mix

€

Optional, from your quote

Bags needed

96bags

For 10 m² at 10 cm thickness you need 1 m³ of concrete (2,400 kg) – that is 96 bags of 25 kg.

Thickness exaggerated for clarity

Volume: 1 m³
WeightAssumption 2,400 kg/m³; standard concrete is 2,000–2,600 kg/m³ under DIN EN 206: 2,400 kg
Bagsapproximation from the weight; the yield on the bag is more accurate: 96

How this was calculated

V = 10 m² × 0.1 m = 1 m³

m = 1 m³ × 2,400 kg/m³ = 2,400 kg

Bags ≈ ⌈2,400 ÷ 25⌉ = 96

Volume = area × thickness. Weight uses the density of concrete (about 2,400 kg/m³). Bags are always rounded up.

What you can do

Large quantities: consider ready-mix
From about 2 m³, ready-mix concrete from a concrete plant is usually more economical than dry mix in bags. Ready-mix is ordered in m³.