Calculators
Every calculator on this site, grouped by category.
Foundation
Volumes, areas, and quantities for foundation slabs and concrete work.
- Concrete Slab CalculatorEstimate concrete volume for a slab from its length, width, and thickness.
- Strip Foundation CalculatorTake off concrete, blinding, reinforcement, stirrups, and formwork for a strip foundation, plus the waterproofing and insulation areas and an indicative bearing pressure.
- Bored Pile Foundation CalculatorTake off concrete and steel for a bored pile foundation: pile layout from the building perimeter or by count, pile reinforcement (bars and spiral or stirrups), the grade beam tying the piles with its own bars, stirrups and above-grade formwork, and totals across the whole foundation.
- Raft Slab Foundation CalculatorTake off concrete, blinding, insulation, welded mesh sheets (packed with laps), and edge formwork for a monolithic raft slab, plus the waterproofing area and an indicative self-weight bearing pressure.
- Frost Depth Calculator (Lithuania)Design frost penetration depth for a footing in Lithuania: the SNiP/VGTU formula on STR 2.01.12:2024 climate normals by station and soil type, adjusted for a heated building, shown next to the regulation's own observed maximum frost depths.
- Excavation CalculatorEstimate the dug (bank) and loose volume of a pit or trench with optional side slopes, the compacted backfill after the foundation is placed, and the soil to haul away and fill to import, with truck loads, whether the backfill reuses the excavated soil or is imported.
- Foundation Drainage CalculatorPipe, gravel, geotextile and inspection well quantities for a perimeter foundation drain, plus trench excavation volume.
- Concrete Mix CalculatorCement bags, sand, gravel and water for a site-mixed concrete ratio (by volume or by mass), with a dry-volume allowance.
- Strip Foundation Formwork CalculatorBoards, courses, stakes, braces, ties and fixings for strip foundation formwork, from the outline, height and width.
- Monolithic Floor Slab CalculatorEstimate concrete volume, soffit formwork area, and prop count for a monolithic suspended concrete floor slab.
- Rebar Weight CalculatorConvert reinforcing bar diameter, length, and count into mass for one or more bar entries.
Openings
Trim, casing, and other quantities for doors and windows.
Stairs
Riser heights, tread depths, and cutting dimensions for stairs.
- Straight Stair CalculatorWork out riser height, tread depth, stringer cutting dimensions, and a full 3D model for a straight flight of stairs.
- L-Shaped Stair with Landing CalculatorWork out riser height, going, pitch, stringer lengths for both flights, the landing, and a full 3D model for a 90-degree turn stair with a landing.
- U-Shaped Stair with Landing CalculatorWork out riser height, going, pitch, stringer lengths for both flights, the landing, and a full 3D model for a 180-degree turn stair with a half-landing.
Roof
Rafter lengths, pitch, and cutting angles for roof framing.
- Rafter Length CalculatorWork out common rafter length, overhang length, and plumb/seat cut angles from span, pitch, and overhang.
- Mono-Pitch Roof CalculatorTake off a single-slope roof: rafter length and count, timber volume, eaves length, and the true roof surface area next to its plan projection.
- Gable Roof CalculatorTake off a two-slope roof: ridge length, rafter length and count per slope, each slope's area, gable-end triangles, and the true roof area next to its plan projection. Handles unequal pitches.
- Roof Battens CalculatorTiling battens and counter-battens over the rafters: rows per slope at the covering's gauge, total length, stock lengths packed (not divided), counter-batten count and timber volume.
- Gutters and Downpipes CalculatorRainwater goods take-off: gutter length and stock lengths, brackets, corners, stop ends, downpipes sized by the EN 12056-3 method (effective roof area, rainfall intensity, gutter and pipe capacity), with their brackets, outlets and shoes.
- Roof Sheets CalculatorCount profiled metal roof sheets for a gable roof: sheets per slope from the effective cover width, the sheet length to order (rounded up to the product's module if it has one), ridge caps, verge trims and roofing screws.
- Hip Roof CalculatorEstimate ridge length, common/hip/jack rafter counts and lengths, and covering area for a simple uniformly-pitched hip roof.
- Gambrel Roof CalculatorEstimate rafter lengths, ridge height, and covering area for a two-slope gambrel roof (open gable ends) with a lower steep pitch and an upper shallow pitch.
Walls
Block and brick quantities for walls, including openings and waste.
- Masonry Wall CalculatorEstimate the number of blocks or bricks needed for a wall, accounting for openings, mortar joints, and waste.
- Wall Tile CalculatorEstimate the number of wall tiles, adhesive, and grout needed, accounting for openings, joints, and waste.
- OSB Wall Sheathing CalculatorEstimate how many OSB sheets, framing members, and fasteners a wall needs, onto framing or an existing solid substrate, accounting for openings, orientation, and support alignment.
- Drywall Partition CalculatorEstimate CW/UW metal frame, plasterboard, corner, and consumable quantities for a room's drywall partitions, accounting for door/window openings and waste.
- Plaster CalculatorEstimate plaster volume, mass, and bags needed for a wall, accounting for openings, layer thickness, and waste.
- Paint CalculatorEstimate paint volume and containers needed for a wall, accounting for openings, coats, and waste.
- Wallpaper CalculatorEstimate wallpaper strips and rolls needed for a wall, accounting for pattern repeat and waste.
- AAC Block Wall CalculatorEstimate AAC (aerated autoclaved concrete) block count, thin-bed adhesive, bed-joint reinforcement, and lintel blocks for a wall.
- Ceramic Block Wall CalculatorEstimate full and half ceramic hollow block counts and mortar or glue jointing quantities for a wall.
- Timber Frame Wall CalculatorEstimate stud count, plate and noggin length, sheathing sheets, insulation packs, and vapour barrier rolls for a timber-frame stud wall.
- Log Wall CalculatorEstimate course count, log count, and inter-log seal length for a round or squared log wall.
- Mortar CalculatorEstimate mortar volume, cement bags, sand, and water for brick or block masonry from a per-area or per-unit consumption rate and an editable cement:lime:sand proportion.
- Monolithic Wall CalculatorEstimate concrete volume, double-sided formwork area, and tie count for a monolithic cast in-situ concrete wall.
Ceilings
Tile quantities and material estimates for ceiling coverings.
- OSB Ceiling Sheathing CalculatorEstimate how many OSB sheets, framing members, and fasteners a ceiling needs, onto joists or an existing solid substrate, accounting for openings, orientation, row stagger, and support alignment.
- Drywall Ceiling CalculatorEstimate CD/UD metal frame, plasterboard, and consumable quantities for a plasterboard ceiling on a suspended metal frame, including bearing and furring runs, hangers, connectors, and wall angle.
- Ceiling Tile CalculatorEstimate the number of ceiling tiles, adhesive, and grout needed for a room, accounting for joints and waste.
Floors
Tile quantities and material estimates for floor coverings.
- Floor Tile CalculatorEstimate the number of floor tiles, adhesive, and grout needed for a room, accounting for joints and waste.
- Laminate Flooring CalculatorEstimate laminate packs, planks, underlay, and skirting length for a room, accounting for the expansion gap at the walls and waste.
- Sheet Flooring CalculatorEstimate roll length, strip layout, and seams for linoleum, sheet vinyl, and carpet sold off a fixed-width roll.
- Floor Screed CalculatorEstimate floor screed mass and bags from room area, thickness and the product's consumption rate, plus primer and perimeter edge strip.
- Slab-on-Ground Insulation CalculatorBoard, damp-proof membrane and edge strip quantities for insulation under a slab-on-ground floor.
Insulation
Board, framing, and fixing quantities for wall and attic floor insulation systems.
- Render Facade (ETICS) Insulation CalculatorEstimate insulation boards, adhesive, anchors, and reinforcing mesh for a rendered (ETICS) wall insulation system, plus its thermal resistance.
- Vented Facade Insulation CalculatorEstimate framing, insulation boards, wind barrier membrane, and fixings for a vented (rainscreen) facade.
- Attic Insulation CalculatorBatts/rolls or loose-fill packs, and vapour barrier rolls, for attic floor insulation laid between and over the ceiling joists.
- U-Value CalculatorCalculate the thermal transmittance (U-value) of a layered wall, roof, or floor from each layer's thickness and thermal conductivity.
Heating
Pipe length, loop count, and screed quantities for water underfloor heating.
Electrical
Voltage drop, cable quantities, and socket/switch counts for simple electrical planning.
- Voltage Drop CalculatorEstimate the voltage drop over a single-phase or three-phase cable run, as an absolute value, a percentage of nominal voltage, and the voltage arriving at the load.
- Cable Run Length CalculatorEstimate how much cable to buy for a wiring run — net length, length with slack, length with waste, and how many coils to buy.
- Socket and Switch Count CalculatorDerive socket count, switch count, and circuit count from a real list of appliances and fixed points placed on the room's own walls — not from floor area alone.
- Lighting CalculatorEstimate luminaire count for a room using the lumen method from a target illuminance level.
Exterior
Paving, fences and garden retaining walls: material quantities for outdoor hard landscaping.
- Paving CalculatorEstimate pavers (with cut waste), pallets, bedding sand and compacted sub-base gravel (compacted and loose order volumes), and edge restraint for a patio, path, or driveway of any shape.
- Fence CalculatorEstimate fence posts (end, corner, gate and line posts), rails, boards or ready panels, and post-hole concrete for one or more fence runs with gates.
- Retaining Block Wall CalculatorEstimate blocks, capping units, drainage gravel, perforated drain pipe and geotextile for a low segmental block retaining wall. Quantities only — no structural design.
- Bulk Material Mass CalculatorConvert between tonnes and cubic metres for sand, gravel, crushed stone or topsoil, and count truck loads.
- Asphalt CalculatorEstimate hot-mix asphalt tonnage and truck loads for paving a rectangular area.
- Lawn CalculatorEstimate grass seed or turf rolls, topsoil volume, and optional fertiliser for a rectangular lawn area.
- Chain-Link Fence CalculatorEstimate mesh rolls, posts, tension wire, fixings, and post-hole concrete for a straight chain-link fence run.
- Gabion CalculatorEstimate basket count, stone fill volume and mass, and geotextile for a gabion (wire basket) retaining wall.
- Profiled Sheet Fence CalculatorEstimate profiled sheets by effective coverage width, posts, rails, and screws for a straight fence run.
- Kerbs CalculatorEstimate kerb unit count and the concrete bed and haunch volume for a kerb line.
Carpentry
Boards, joists, bearers, posts and fixings for timber structures such as decks.
- Decking CalculatorEstimate deck boards with a real stock-length cutting plan, plus joists, bearers, posts and screws or hidden clips for a rectangular deck.
- Timber Volume CalculatorVolume of sawn (dimensional) timber from section and length, or round logs using Huber's formula.
- Firewood CalculatorConvert a stacked firewood pile's dimensions into stacked, solid, and loose volume.
Waterproofing
Membrane, sealing tape, corner piece and collar quantities for wet rooms.
Finishing
Quantities for the finishing pass around window and door joints, such as expanding foam.
Demolition
Debris volume, mass and container/skip counts for demolition and clearance work.