Mortar, Cement & Concrete Bags Calculator by Area (m²) and Thickness

Calculate how many 25 kg bags of dry mortar, screed, self-leveling compound or concrete mix you need from area in m² and thickness in cm.

Material Type (Dry Bulk Density)

Surface Area to Cover (m²)

Average Layer Thickness (cm)

Substrate Irregularity Margin

25 kg Bags Required64 Bags

Total Dry Weight1.584 kg

Geometric Volume0.80 m³

Estimated Pallets (56 bags)1.14 Pallets

Dry Bulk Density & Bag Conversion Formula

Material Standard (EN 998-1 / EN 206): Dry pre-mixed mortars require between 16 and 22 kg of dry powder per m² per centimeter of thickness.

Volume (m³) = Surface Area (m²) × (Thickness in cm / 100)
Number of 25 kg Bags = (Area m² × Thickness cm × Density kg/m²·cm × Waste Factor) / 25

Site Application	Mix Ratio (Cement:Sand:Gravel)	Cement per m³	Sand / Gravel per m³	Water Approx.
M-5 Masonry / Rendering Mortar	1 : 5 (No gravel)	300 kg (12 bags)	1,150 kg sand	185 Liters
M-7.5 Floor Screed Mortar	1 : 4 (No gravel)	350 kg (14 bags)	1,100 kg sand	195 Liters
Lean / Blinding Concrete C12/15	1 : 3 : 5	225 kg (9 bags)	680 kg sand / 1,150 kg gravel	150 Liters
Structural Concrete C25/30	1 : 2 : 3	350 kg (14 bags)	650 kg sand / 1,050 kg gravel	175 Liters

Pre-mixed dry screed requires ~18 to 20 kg per m² per cm of thickness: a 5 cm layer requires roughly 4 bags (100 kg) per m².

A standard 1:4 floor screed mix requires roughly 350 kg of Portland cement (14 bags of 25 kg) and 1,100 kg of washed sand per cubic meter.