Free UK Trade & Building Calculators
757 free calculators built for UK tradespeople and DIYers. Metric measurements, UK product sizes, UK building regulations. No signup required.
Plastering & Rendering
Calculate plaster, plasterboard, rendering materials and more for any UK project.
30 calculators →
Electrical
UK electrical calculators based on BS 7671 18th Edition wiring regulations.
45 calculators →
Plumbing & Heating
Pipe sizing, boiler calculations, radiator and heating system tools for UK properties.
45 calculators →
Roofing
Calculate tiles, felt, battens, guttering and all roofing materials for UK roof types.
30 calculators →
Flooring
Screed, tiles, laminate, carpet and all flooring material calculators.
28 calculators →
Landscaping & Groundworks
Topsoil, gravel, drainage, fencing, decking and garden material calculators.
45 calculators →
Structural & Concrete
Concrete, blocks, bricks, mortar and structural material calculators.
40 calculators →
Painting & Decorating
Paint coverage, wallpaper, primer and decorating material calculators.
22 calculators →
Insulation & Energy
U-value, heat loss, insulation thickness and energy efficiency calculators.
30 calculators →
Tiling & Bathrooms
Wall tiles, adhesive, grout, shower trays and bathroom calculators.
25 calculators →
Fencing & Boundaries
Fence panels, posts, concrete, gravel boards and boundary calculators.
18 calculators →
General & Conversions
Area, volume, unit converters and general-purpose construction tools.
35 calculators →
Carpentry & Joinery
Staircase, stud wall, door lining and balustrade calculators for UK building projects.
28 calculators →
Drainage & Water Management
Drainage, sewage, attenuation and water management calculators for UK Building Regulations.
23 calculators →
Loft & Attic
Loft boarding, conversion, ventilation and attic calculators for UK properties.
18 calculators →
Damp & Timber Treatment
Damp proofing, timber treatment, mould removal and condensation calculators.
16 calculators →
Drywall & Plasterboard
Calculate plasterboard sheets, joint tape, filler, screws and nogging for drylining walls and ceilings.
12 calculators →
Regulations & Compliance
Building control fees, planning applications and UK Building Regulations compliance tools.
15 calculators →
Glazing & Windows
Window U-values, glazing units, sealants, bi-fold doors and glass calculators.
22 calculators →
Fire Safety & Part B
Fire doors, fire stopping, compartmentation, escape routes and Part B compliance calculators.
22 calculators →
Renewables & Heat Pumps
Heat pump sizing, solar PV, battery storage, biomass and renewable energy calculators.
25 calculators →
HVAC & Ventilation
Extract fans, ductwork, MVHR, air conditioning and ventilation calculators.
20 calculators →
Steelwork & Metalwork
Steel beams, columns, connections, balustrades and metalwork calculators.
16 calculators →
Scaffolding & Access
Scaffold hire, tower scaffolds, MEWP selection and working at height calculators.
12 calculators →
Demolition & Strip-Out
Demolition waste, asbestos surveys, strip-out quantities and disposal calculators.
12 calculators →
Basement & Cellar
Basement conversion, waterproofing, underpinning and cellar calculators.
12 calculators →
Extensions & Conversions
Extension costs, foundations, roofing, garage conversions and building project calculators.
22 calculators →
Estimating & Business
Day rates, job pricing, tax, CIS, profit margins and business calculators for tradespeople.
22 calculators →
Health & Safety
Manual handling, noise exposure, COSHH, CDM and construction health and safety calculators.
12 calculators →
Sustainability & Green Building
Embodied carbon, recycled materials, green roofs, Passivhaus and sustainable construction calculators.
12 calculators →
Glossary
Plain-English definitions of common UK building and trade terms.
25 calculators →
Reference
Useful reference guides, charts and tables for UK construction and trades.
18 calculators →
Quick Answers
View all →How many bricks per m²?
60 bricks (stretcher bond) or 120 (full brick).
How many bags of plaster for a room?
~22 bags multi-finish for a standard 3.5m × 4m room.
How much concrete for a shed base?
0.72m³ for a 3m × 2.4m × 100mm slab.
How much gravel for a driveway?
~1.28 tonnes for a 5m × 3m driveway at 50mm depth.
How many roof tiles per m²?
10-60 tiles/m² depending on tile type.
How much loft insulation?
~6 rolls of mineral wool for an 8m × 6m loft.
Reference Tables
View all →Quick-reference tables for UK building materials, dimensions, and standards.
UK Trade Calculators — Built for Tradespeople
TradeCalculator is the UK's most comprehensive collection of free building and trade calculators. Every tool uses metric measurements, UK-standard product sizes (like 2400×1200mm plasterboard sheets and standard 25kg bags), and references UK building regulations where relevant.
Whether you're a plasterer estimating how many bags of multi-finish you need, an electrician sizing cables to BS 7671 18th Edition, or a homeowner working out how much gravel to order for a driveway — we've got a calculator for it. All tools include a wastage allowance and let you input your own material prices for accurate cost estimates. Browse all 757+ calculators or check the building glossary for trade terms.
Every calculator works on your phone, loads instantly, and requires no signup or account. Just pick your calculator, enter your measurements, and get your answer. Built by tradespeople, for tradespeople.