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DIY
DIY Calculators
54 free diy calculators with clear, detailed guides.
All DIY Calculators
Beam Load & Bending Moment Calculator
Calculate maximum bending moment, shear force, and deflection for simply supported beams with point loads or uniformly distributed loads.
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Brick Calculator
Calculate how many bricks you need for any wall. Enter wall dimensions and brick type to get an exact count with mortar and waste allowance.
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Concrete Footings Calculator
Calculate concrete needed for strip foundations, pad footings, and post holes. Get volumes, bag quantities, and mix ratios for any foundation type.
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Concrete Mix Ratio Calculator
Calculate the exact quantities of cement, sand, and aggregate for any concrete mix ratio. Works for C15, C20, C25, and C30 concrete grades.
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Concrete Mix Ratio Calculator (Cement, Sand, Aggregate)
Calculate concrete materials by volume and weight. Cement, sand, aggregate ratios for foundations, slabs, paths, and structural concrete.
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Concrete Volume Calculator
Calculate concrete needed for any slab, path, or pour in cubic metres and bags. Works for rectangular and circular slabs.
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Deck Boards Calculator
Calculate how many deck boards you need for any deck size. Accounts for board width, gap spacing, and waste percentage.
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Decking Calculator
Calculate how much decking you need and estimate material costs for any size deck. Covers boards, joists, posts, and fixings.
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Decking Cost Calculator UK (Composite & Timber)
Calculate UK decking costs by area and material. Composite (Trex, Millboard) vs timber (softwood, hardwood) with installation rates.
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Decking Material Calculator — Boards, Joists & Fixings
Calculate how much decking board, joists, posts, and fixings you need for any deck. Covers composite, hardwood, and softwood decking.
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Drainage Fall & Gradient Calculator
Calculate the correct drainage fall for any length of pipe. Find the drop required for 1:40, 1:60, and 1:80 gradients for foul water and surface water drainage.
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Drywall / Plasterboard Calculator
Calculate how many sheets of drywall or plasterboard you need for any room. Covers walls, ceilings, and waste allowance.
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Electrical Cable Size Calculator
Calculate the correct cable size (CSA) for any electrical circuit in the UK. Based on current load, cable length, and installation method.
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External Render & Plaster Coverage Calculator
Calculate render coverage for external walls. Find sand, cement, and lime quantities for sand:cement render and lime render.
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Fence Cost Calculator
Calculate how many fence panels, posts, and gravel boards you need and estimate the total cost of any garden fence.
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Fence Panel & Post Calculator
Calculate how many fence panels, posts, concrete, and gravel you need for any fence run. Works for any panel width with post spacing options.
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Fence Post Calculator
Calculate how many fence posts and panels you need for any run. Works for all panel widths and includes concrete quantities.
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Floor Levelling Compound & Self-Levelling Screed Calculator
Calculate how many bags of floor levelling compound or self-levelling screed you need for any area and depth. Covers feather-edge repairs and full pours.
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Floor Underlay Calculator
Calculate how much carpet underlay, laminate underlay, or acoustic underlay you need for any room. Includes adhesive tape and gripper rod quantities.
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Garden Fence Panel & Post Calculator
Calculate how many fence panels, posts, concrete, and postcrete you need for any fence run. Covers closeboard, lap, and trellis panels.
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Garden Fencing Cost & Material Calculator
Calculate fence panels, posts, and total cost for any garden fence. Find materials needed for new boundaries or replacement.
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Garden Soil & Topsoil Calculator
Calculate how much topsoil, compost, or raised bed mix you need for any garden bed, raised bed, or lawn area.
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Grass Seed Calculator
Calculate how much grass seed you need for any lawn area. Covers new lawns from scratch and overseeding thin or bare patches.
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Gravel Calculator
Calculate how much gravel, pea shingle, or crushed stone you need for any area. Get tonnes and bulk bag quantities.
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Landscaping Materials Calculator — Turf, Topsoil & Gravel
Calculate how much turf, topsoil, gravel, bark chippings, or decorative aggregate you need for any garden area. Includes waste and coverage rates.
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Loft & Wall Insulation Calculator
Calculate insulation materials, costs, and energy savings for loft and cavity wall insulation. Find out payback period and available grants.
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Loft Flooring & Storage Calculator
Calculate loft flooring needed for storage with insulation. Find raised flooring kits, boards, and load capacity for your loft.
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Lumber Board Feet Calculator
Calculate board feet of lumber for any project. Enter dimensions and quantity to find total board footage and estimate costs.
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Mortar Mix Ratio & Quantity Calculator
Calculate the correct mortar mix ratio and quantity of cement, sand, and water for bricklaying, pointing, plastering, or rendering.
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Mortar Mix Ratio Calculator (Sand:Cement)
Calculate mortar quantities for bricklaying, pointing, rendering. Sand, cement, lime, plasticiser ratios for any wall area.
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Mulch Calculator
Calculate how much garden mulch you need for any bed or border. Works for bark chippings, wood chip, compost, and decorative mulches.
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Paving Slab Calculator
Calculate how many paving slabs you need for any patio, path, or driveway. Includes mortar, sand, and hardcore quantities.
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Plasterboard & Drywall Calculator
Calculate how many plasterboard sheets you need for walls and ceilings. Includes joint tape, screws, and compound quantities.
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Plastering Calculator
Calculate how much plaster, bonding, and scratch coat you need for any room. Covers skimming over plasterboard, solid walls, and patching.
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Raised Bed Soil Calculator (Volume & Cost)
Calculate how much soil or compost you need to fill a raised garden bed. Volume in litres and cubic metres, bags needed, and cost estimate.
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Render & Monocouche Coverage Calculator
Calculate how many bags of render, monocouche, or roughcast you need for any wall area. Covers scratch coat, top coat, and single-coat systems.
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Roof Area Calculator
Calculate the total roof area for any pitched roof, including rafters and valleys. Essential for roofing tiles, felt, and insulation quantities.
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Roof Pitch & Rafter Length Calculator
Calculate roof pitch angle, rafter length, and roof area from span and rise measurements. Covers felt, battens, and tile quantities.
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Roofing Shingles Calculator
Calculate how many roofing shingles or tiles you need for any roof. Enter dimensions and pitch to get square footage and bundle count.
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Sand Calculator
Calculate how much sand you need for any project — jointing, bedding, screeding, plastering, or laying slabs. Get tonnes and bags.
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Shed Base Calculator (Concrete & Paving)
Calculate materials for a shed base — concrete, paving slabs, or bearers. Works for any shed size and gives exact quantities for concrete mix.
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Skirting Board & Architrave Calculator
Calculate how many metres of skirting board and architrave you need for any room. Accounts for corners, doorways, and standard join lengths.
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Soakaway Size Calculator (UK Drainage)
Calculate soakaway size for surface water drainage. UK BRE 365 method using roof area, soil percolation rate, and rainfall.
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Solar Panel Output Calculator
Estimate how much electricity your solar panels will generate and how long until they pay for themselves.
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Stair Stringer Calculator
Calculate the number of stairs, riser height, and tread depth for any staircase. Includes building regulation compliance checks.
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Staircase Design & Rise/Going Calculator
Calculate the correct rise, going, and number of steps for a staircase. Check Building Regulations compliance for pitch, headroom, and handrail requirements.
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Staircase Rise & Going Calculator (UK Building Regs)
Calculate staircase rise, going, and pitch to UK Building Regulations Part K. Number of steps, headroom, and compliance for domestic stairs.
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Staircase Rise, Run & Railing Calculator
Calculate stair rise, going (run), number of steps, and railing height for any floor-to-floor height. Checks compliance with UK Building Regulations Part K.
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Suspended Ceiling Grid & Tile Calculator
Calculate the number of ceiling tiles, main runners, cross tees, and wall angles needed for a suspended grid ceiling. Works for any room size.
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Tile & Grout Calculator
Calculate how many tiles you need and how much grout and adhesive for any tiling project. Works for floors, walls, backsplashes, and bathrooms.
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Tile Quantity & Cost Calculator (Floor, Wall, Splashback)
Calculate tile quantities for floors, walls, and splashbacks. Includes wastage, adhesive, grout, and UK 2024 cost estimates.
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Tiling Time Estimator
Estimate how long a tiling job will take based on area, tile size, and your experience level. Useful for planning projects and quoting work.
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Turf & Lawn Quantity Calculator (UK)
Calculate how much turf you need for a lawn, with wastage, topsoil, and cost. UK turf roll sizes and laying guidance.
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Underfloor Heating Calculator
Calculate underfloor heating mat area, wattage, and running costs for electric underfloor heating. Works for tiles, stone, and other floor types.
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About our diy calculators
Our DIY calculators cover building and outdoor projects: concrete and mortar, bricks and blocks, gravel and aggregates, decking, fencing, stairs, roofing, mulch and topsoil, and timber. Each estimates the materials you need with a clear method and a waste allowance built in.
Material estimation is where DIY projects most often go wrong, so these tools follow established trade rules (UK building regs for stairs, the roofing-square unit, standard brick counts per square metre) and the guides explain the practical considerations — sub-bases, mix ratios, and why ordering slightly extra beats running short.
Every calculator is free and needs no account, giving a dependable materials estimate for planning and ordering.