Span64

Web calculator

Concrete yards calculator

Work out how much concrete a rectangular slab takes, in cubic yards and in bags, with room for waste.

Slab length
Slab width
Slab thickness
Order

Spillage, over-excavation and uneven subgrade.

Estimate · volume to three decimals

1.630 cubic yards with waste

Net volume
1.481 cu yd40.000 cu ft
With waste
1.630 cu yd44.000 cu ft
Bags of 80 lb
74Whole bags, rounded up.
Exact to 1/64″ in the app

Web estimates round lengths to 1/16″. Nothing you type is stored or sent anywhere. Span64 works to an exact 1/64″ on iPhone, iPad and Android.