Backfill Calculator

Foundation Length (ft)

Foundation Width (ft)

Excavation Depth (ft)

Foundation Wall Thickness (in)

Work Space Each Side (ft) Extra width excavated for forming/work

Backfill Material

Trench Length (ft)

Top Width (ft)

Bottom Width (ft) Same as top for vertical walls

Trench Depth (ft)

Pipe Diameter (in) Enter 0 if no pipe

Bedding Depth Below Pipe (in)

Backfill Material

Pipe Length (ft)

Pipe Outside Diameter (in)

Trench Width (ft)

Trench Depth (ft)

Pipe Zone Material

Cover Above Pipe (in) Bedding material above pipe

Bedding Below Pipe (in)

Area Length (ft)

Area Width (ft)

Fill Depth (ft)

Fill Material

Compaction Required?

Material	Bank Density (lb/cy)	Loose Density (lb/cy)	Swell Factor	Shrink Factor
Clay (dry)	2,700	2,000	1.35	0.90
Clay (wet)	3,000	2,200	1.35	0.90
Sand (dry)	2,600	2,300	1.12	0.95
Sand (wet)	2,900	2,500	1.15	0.95
Gravel (dry)	2,800	2,500	1.12	0.95
Crushed stone	2,700	2,100	1.30	1.00
Topsoil	2,200	1,800	1.20	0.90
Mixed earth	2,500	2,000	1.25	0.90