BuildCostLab
Calculator directory

Choose the right calculator faster

Search the library by job, material, or buying task, then open the matching calculator and its linked project hub for the next step.

103 calculators 25 project hubs 324 support guides

Start with a project plan

When the job has several material decisions, open a planner first. The full calculator directory stays below for one-off estimates and wider browsing.

Planner6 calculators

Patio Planner

A patio order is more than a slab count. Work from the finished area into slabs, Type 1, bedding sand, jointing, edge details, and budget checks before anything is ordered.

Plan this job
Planner6 calculators

Driveway Base Planner

Driveway base costs rise or fall on depth, compaction, membrane, delivery access, and the difference between fill and finished surface material. Plan those layers before comparing quotes.

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Planner5 calculators

Drainage Trench Planner

Drainage quotes are easier to compare when the trench is split into pipe, bedding, gravel surround, membrane, fittings, spoil, and reinstatement instead of one broad allowance.

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Planner7 calculators

Room Flooring Planner

Room flooring estimates should connect the floor covering with packs, underlay, trims, skirting, thresholds, subfloor prep, and fitting cost before the order is treated as finished.

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Planner6 calculators

Ceiling Plasterboard Planner

A ceiling board job can look simple on area alone, but the real list needs board orientation, fixings, jointing, skim, access, waste, and paint checked together.

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Planner5 calculators

Decking Planner

Decking needs a surface count and a frame count. Boards, joists, screws, supports, trims, rails, steps, and finish choices should be priced from the same deck size.

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Planner5 calculators

Roofline Planner

Roofline work is easiest to price when gutter runs, outlets, downpipes, fascia, soffit, guards, clips, access, and disposal are counted from the same roof edge survey.

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Planner5 calculators

Shed Roof Planner

Small roofs are unforgiving because overlaps, ridge details, edge waste, battens, fixings, and timber finish can use more material than the floor footprint suggests.

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Planner6 calculators

Garden Surface Planner

Garden surface jobs often mix lawn, soil, seed, bark, membrane, edging, and decorative gravel. Separate the areas before buying materials or asking for landscaping quotes.

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Planner5 calculators

Tile Prep Planner

Tile jobs go wrong when the boxes are counted but the substrate, backer board, adhesive, grout, trims, waterproofing, prep, and labour are not priced clearly.

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High-demand calculators to check first

These pages match the material and project searches already getting visibility, so they are useful starting points when you want the fastest route into a relevant estimate.

Search the calculator library

Use the filters to find the right estimate quickly, then jump into the supporting guide and quote-prep path when you need more than a raw number.

Showing all 103 calculators.

Joinery 2 guides
Materials

Coving Calculator

Estimate coving lengths, whole pieces, and ceiling-perimeter buying quantities before you order lightweight or plaster coving.

Trim and Joinery Estimating Estimate - compare - brief
Open calculator Open project hub
Popular Aggregates 4 guides
Materials

Gravel Calculator

Estimate gravel volume, tonnage, bulk bags, and rough cost for driveways, decorative areas, and base layers.

Gravel and Aggregate Estimating Estimate - compare - brief
Open calculator Open project hub
Popular Decorating 4 guides
Materials

Paint Calculator

Estimate paint quantities, tin mixes, and rough material cost for walls, ceilings, and single surfaces.

Paint Estimating Estimate - compare - brief
Open calculator Open project hub
Planning workflow

Start with the right estimate

Choose the calculator that matches the actual material or project decision first. That keeps later checks clearer.

Sense-check

Use guides and assumptions

Most pages link into worked examples, buying checks, and practical notes so you can test the result before buying.

Quote prep

Turn numbers into a cleaner brief

Use the quote checklist and calculator export tools to send suppliers or installers the same scope and exclusions.