50+ Specialist Calculators
Instant Results - No Sign-Up
Free to Use
Professional tools for serious builders

Building a new house involves more individual material orders than almost any other project type. From the first concrete pour in the foundation trench to the final coat of paint, you will call off dozens of separate deliveries across a build programme that typically spans 12 to 24 months. Getting quantities right at each stage avoids the two most costly mistakes in self-build: over-ordering materials that sit on site and get damaged or stolen, and under-ordering that halts the programme while you wait for a redelivery.

This kit organises every material calculator relevant to a standard UK brick-and-block cavity wall house into 7 stages, following the natural sequence of a build. Enter your ground floor footprint, storey count and wall height in the panel on the right, and each calculator opens pre-loaded with your dimensions as a starting point. Save each result to your project as you complete it - by the time you reach Stage 7 you will have a complete bill of materials covering the whole build. For a deeper guide to each stage of the process, see the Self-Build Hub.

Stage 1 Groundworks & Foundations 7 calculators
1
Concrete Volume (foundations)
Calculate the readymix concrete volume for strip or raft foundations. Uses your plot perimeter and foundation trench dimensions to give total m³ required.
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2
Rebar Calculator (foundation reinforcement)
Work out reinforcement bar quantities for strip foundations or a reinforced ground slab. Gives total lineal metres, bar count and weight by diameter.
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3
Aggregate & Ballast (sub-base)
Calculate hardcore, MOT Type 1 and ballast quantities for the sub-base layer below the ground floor slab. Also covers temporary access road hardcore.
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4
Damp Proof Membrane
Calculate the DPM sheet area needed to cover the full ground floor slab footprint before pouring. Includes overlap allowance.
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5
Concrete Screed (ground floor slab)
Calculate sand-cement or liquid screed volumes to finish the ground floor to the correct level. Enter floor area and screed thickness to get total volume and mix quantities.
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6
Rainwater Attenuation
Calculate required attenuation volume for surface water drainage from the plot. Required under Part H of Building Regulations for most new builds in England and Wales.
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7
Gravel & Stone (drainage)
Work out gravel or shingle quantities for drainage blankets, French drains and temporary site access roads during the groundworks phase.
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Stage 2 Walls & Superstructure 4 calculators
8
Brick Calculator (external leaf)
Calculate facing brick quantities for the external skin of all external walls. Enter total wall area and brick format - deduct window and door openings before ordering.
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9
Concrete Block Calculator (inner leaf & internal walls)
Calculate aircrete or dense concrete block quantities for the inner leaf of the cavity wall and all internal loadbearing walls. Run once for inner leaf, again for partitions.
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10
Masonry Mortar Calculator
Calculate sand and cement quantities for all mortar joints in the external and internal masonry. Covers both brick and block mortar in one pass.
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11
Stud Wall Calculator (non-loadbearing partitions)
Calculate timber stud counts, noggins and top/sole plate lengths for non-loadbearing internal partition walls - typically used for bathroom and en-suite divisions.
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Stage 3 Roofing 6 calculators
12
Roof Pitch & Rafter Calculator
Calculate rafter lengths, ridge board length, hip and valley lengths for a pitched roof. Essential for ordering structural roof timbers before the roof is cut.
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13
Roof Tile Calculator
Calculate concrete or clay roof tile quantities from your roof area and pitch. Accounts for tile format, gauge and a recommended waste allowance.
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14
Roofing Felt & Membrane
Calculate breathable roofing membrane or traditional felt quantities for the full roof area. Enter roof slope area (not plan area) for accurate coverage.
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15
Flashing Calculator
Calculate lead or code-3 aluminium flashing lengths for chimney, abutment, valley and verge details. Enter each junction type separately.
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16
Soffit & Fascia Calculator
Calculate uPVC or timber soffit board and fascia lengths for all eaves runs. Includes corner allowances and recommended fixing quantities.
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17
Guttering & Rainwater Goods
Calculate gutter lengths, downpipe runs, stop ends, unions and brackets for the full perimeter eaves. Based on total eaves length and number of downpipes required.
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Stage 4 Insulation 2 calculators
18
Insulation Calculator (cavity wall & loft)
Calculate cavity wall insulation batt quantities for the external wall cavity, plus loft/roof insulation area for the cold loft or warm roof buildup. Run separately for each zone.
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19
Underfloor Insulation
Calculate rigid insulation board quantities for underfloor insulation below a ground-bearing slab or suspended timber ground floor. Enter floor area and insulation thickness.
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Stage 5 Dry Lining & Plastering 3 calculators
20
Plasterboard Calculator (walls)
Calculate plasterboard sheet counts for all internal wall faces. Enter total wall area and deduct door openings. Run separately from ceilings to get accurate board size splits.
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21
Plasterboard Calculator (ceilings)
Calculate plasterboard quantities for all ceiling areas across every storey. Total ceiling area equals your ground floor footprint multiplied by the number of storeys.
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22
Render & Plaster Calculator (skim coat)
Calculate finish plaster or bonding coat quantities for all internal wall and ceiling surfaces. Enter total area to be skimmed for bags of multi-finish or board finish required.
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Stage 6 Internal Finishes 5 calculators
23
Skirting Board Calculator
Calculate skirting board lineal metres for every room. Enter room perimeters (deducting door widths) to get total length and number of standard-length boards to order.
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24
Paint Calculator (walls & ceilings)
Calculate paint quantities for all interior walls and ceilings. Enter total area, number of coats and coverage rate to get litres required. Run separately for each colour.
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25
Hard Flooring Calculator (living areas)
Calculate engineered wood, LVT or laminate quantities for living rooms, hallways and bedrooms. Accounts for board direction, room shape and cutting waste.
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26
Ceramic & Porcelain Tile Calculator (wet rooms)
Calculate floor and wall tile quantities for bathrooms, en-suites and kitchen splash areas. Enter each room separately - tiles, adhesive and grout are all covered.
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27
Door Frame Calculator
Calculate timber or steel door lining and frame quantities for all internal and external door openings. Enter door count and opening dimensions to get total frame lengths.
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Stage 7 External Works 3 calculators
28
Paving & Decking (paths, patio, driveway)
Calculate paving slab, block paving or decking board quantities for external hard surfaces. Enter each area separately - paths, front drive, rear patio - for accurate totals.
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29
Fence Calculator (boundary)
Calculate fence panel, post and gravel board quantities for boundary fencing on all sides of the plot. Enter total fence run length and panel width for post spacing and totals.
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30
Gravel & Stone (landscaping)
Calculate decorative gravel or shingle quantities for garden paths, borders and planted areas once the main building work is complete.
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