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Build Journal Free building-materials calculators and trade know-how for UK builders and self-builders.
Tools

Tools

Free building-materials calculators from Build Journal: concrete, aggregate, mortar, bricks, topsoil and more.

All Tools guides & reviews

MOT Type 1 Calculator: How Many Tonnes and Bulk Bags You Need Tools MOT Type 1 Calculator: How Many Tonnes and Bulk Bags You Need Free MOT Type 1 calculator: enter your length, width and compacted depth to work out the tonnes of Type 1 sub base and how many bulk bags to order, with a compaction allowance built in. Concrete Block Calculator: How Many Blocks Do You Need? Tools Concrete Block Calculator: How Many Blocks Do You Need? Free concrete block calculator for UK builders. Enter your wall length and height, subtract openings, and get the number of standard 440 x 215mm blocks you need, with wastage added. Concrete Calculator UK: Cement, Sand and Ballast by the m3 Tools Concrete Calculator UK: Cement, Sand and Ballast by the m3 Free concrete calculator for UK builders: enter your slab size and mix, and get cement bags, sharp sand and ballast in tonnes, plus total m3 for ready-mix. Sand and Cement Calculator: How Much Do I Need? Tools Sand and Cement Calculator: How Much Do I Need? Free sand and cement calculator for paving beds, patios, brickwork and screed. Enter your area and get sand in tonnes and bulk bags plus 25kg cement bags, with wastage. Aggregate Calculator: Tonnes and Bulk Bags for Sub-base, Gravel and Sand (UK) Tools Aggregate Calculator: Tonnes and Bulk Bags for Sub-base, Gravel and Sand (UK) Free aggregate calculator (UK): enter length, width and depth, pick your material, and get the tonnes and bulk bags you need. Works as a sub base calculator and MOT sub base calculator. Mortar Calculator UK: Sand and Cement for Brickwork, Blockwork and Patios Tools Mortar Calculator UK: Sand and Cement for Brickwork, Blockwork and Patios Free UK mortar calculator: work out the mortar, sand and cement you need by wall area or number of bricks and blocks, with a 10% wastage allowance built in. Includes a patio mortar mode. Floor Joist Span Calculator (C24 & C16): Max Clear Span and Joist Count Tools Floor Joist Span Calculator (C24 & C16): Max Clear Span and Joist Count Free floor joist span calculator for C24 and C16 timber: pick grade, joist size and spacing to get the indicative maximum clear span and the number of joists for your room. UK domestic floors. Topsoil Calculator: How Much Topsoil Do I Need? (UK, m2 and Tonnes) Tools Topsoil Calculator: How Much Topsoil Do I Need? (UK, m2 and Tonnes) Free UK topsoil calculator. Enter your area in m2 and the depth in mm to get the volume in m3, the weight in tonnes, and the number of bulk bags you need. Ballast Calculator: Ballast and Cement for a Concrete Mix Tools Ballast Calculator: Ballast and Cement for a Concrete Mix Free ballast calculator: enter your length, width and depth and get the ballast (tonnes and bulk bags) plus cement (25kg bags) for a shed base, footings or slab. Gravel Calculator UK: Tonnes, Bulk Bags and 25kg Bags Tools Gravel Calculator UK: Tonnes, Bulk Bags and 25kg Bags Free gravel calculator (UK): enter your area in m2 or length x width plus a depth, and get tonnes, bulk bags and 25kg bags for 20mm gravel, with a 5% wastage allowance. Brick Calculator UK: How Many Bricks and How Much Mortar Do You Need? Tools Brick Calculator UK: How Many Bricks and How Much Mortar Do You Need? Free brick calculator for the UK: enter your wall size, subtract openings, and get the number of standard bricks you need plus a brick mortar estimate in sand and cement, with wastage added.