Concrete Mix Calculator

Start in on-site batch mode for cement, sand, aggregate, water, and bag counts. Switch to ready-mix order when you only need cubic yards for a supplier; the same shape and waste inputs are reused.

Primary output 10 cement bags
Choose on-site batch for raw material quantities, or ready-mix order for cubic yards to request from a supplier.
Pick the geometry that matches your forms.
Imperial uses feet for length/height and inches for thickness/diameter. Metric uses meters for length/height and millimeters for thickness/diameter.
Length in feet or meters for slabs, walls, strip footings, and stair rectangle estimates.
Width in feet or meters for slabs and strip footings.
Use inches in imperial mode or millimeters in metric mode. For walls, this is wall thickness.
Height in feet or meters for walls, columns, and tubes.
Use inches in imperial mode or millimeters in metric mode.
Tube or ring pours only. Must be smaller than the outer diameter.
Use this for repeated footings, columns, or matching slabs.
Selects the nominal cement:sand:aggregate parts and water/cement ratio used for material quantities.
Advanced options
Net volume 0.94 m³ Water/cement 0.55 Notes —
Used to round cement mass up to whole bags for on-site batching.
Adds extra volume for spills, uneven subgrade, and ordering cushion.
Used only when Mix grade is Custom.
Used only when Mix grade is Custom.
Used only when Mix grade is Custom.
Used only when Mix grade is Custom.
Answer 10 cement bags
Cement bags 10 bags
Cement 418.6 kg
Sand 697.7 kg
Aggregate 1,264.6 kg
Water 230.2 L
Order volume (m³) 1.04 m³
Net volume (m³) 0.94 m³
Water/cement ratio 0.55
Show calculation details
Net volume (ft³) 33.33 ft³
Mix ratio 1:1.5:3
Nominal class C20
Dry-volume basis 1.6 m³
Notes —