All calculators
Every calculator shows its formula and the figures it starts from. Change any figure to match your product or your own data.
- Air conditioning size calculator Heating
- Amps, kW and kVA converter Electrics
- Appliance running cost calculator Electrics
- Architrave calculator Carpentry
- Artificial grass calculator Landscaping
- Ballast calculator Groundworks
- Bark and mulch calculator Landscaping
- Block paving calculator Landscaping
- Boiler size calculator Heating
- Brick and block calculator Brickwork
- Cable size calculator Electrics
- Carpet calculator Flooring
- Concrete calculator Concrete and mortar
- Concrete mix calculator Concrete and mortar
- Condensation risk calculator Insulation and ventilation
- Consumer unit and RCBO planner Electrics
- Coving calculator Plastering
- Cubic metres to tonnes calculator Groundworks
- Deck substructure calculator Decking and fencing
- Decking calculator Decking and fencing
- Dot and dab adhesive calculator Plastering
- Drain fall calculator Groundworks
- EV charger load calculator Electrics
- Expansion vessel size calculator Plumbing
- Extractor fan size calculator Insulation and ventilation
- Fence and decking stain calculator Decorating
- Fence calculator Decking and fencing
- Flat roof calculator Roofing
- Flooring calculator Flooring
- Gradient and fall calculator Site safety
- Gravel calculator Landscaping
- Grout calculator Tiling
- Guttering and downpipe calculator Roofing
- Hand-arm vibration (HAV) exposure points calculator Site safety
- Heat loss calculator Heating
- Heat pump size calculator Heating
- Home battery size calculator Electrics
- Hot water cylinder size calculator Plumbing
- Insulation thickness calculator Insulation and ventilation
- Job labour time and cost estimator Site safety
- Joist calculator Carpentry
- kW to BTU converter Heating
- Lintel length calculator Brickwork
- Loft boarding calculator Flooring
- Loft insulation calculator Insulation and ventilation
- Max Zs and expected Zs calculator Electrics
- Maximum demand and diversity calculator Electrics
- Mortar calculator Concrete and mortar
- MOT Type 1 calculator Landscaping
- Muck away calculator Groundworks
- Noise exposure calculator Site safety
- Paint calculator Decorating
- Patio calculator Landscaping
- Percolation test calculator Groundworks
- Pipe size and velocity calculator Plumbing
- Plaster calculator Plastering
- Plasterboard calculator Plastering
- Pond liner calculator Landscaping
- Postcrete calculator Decking and fencing
- Radiator size calculator Heating
- Radiator ΔT converter Heating
- Rainwater harvesting tank calculator Landscaping
- Ramp gradient calculator Carpentry
- Render calculator Plastering
- Repointing calculator Brickwork
- Roof batten calculator Roofing
- Roof pitch and rafter length calculator Roofing
- Roof slate calculator Roofing
- Roof tile calculator Roofing
- Sand and cement calculator Brickwork
- Sand calculator Landscaping
- Scaffold hire estimator Site safety
- Screed calculator Concrete and mortar
- Screed drying time calculator Concrete and mortar
- Sealant and caulk calculator Decorating
- Self-levelling compound calculator Flooring
- Silica dust exposure calculator Site safety
- Skip size calculator Groundworks
- Skirting board calculator Carpentry
- Sleeper calculator Landscaping
- Soakaway calculator Groundworks
- Solar PV system size calculator Electrics
- Spindle spacing calculator Carpentry
- Stair calculator Carpentry
- Stud wall calculator Carpentry
- Tile adhesive calculator Tiling
- Tile calculator Tiling
- Topsoil calculator Landscaping
- Turf calculator Landscaping
- U-value calculator Insulation and ventilation
- Underfloor heating calculator Heating
- Voltage drop calculator Electrics
- Wall tie calculator Brickwork
- Wallpaper calculator Decorating
- Water flow rate calculator Plumbing
- Water pressure from height calculator Plumbing