Free · No sign-up · UK sizes

Tools that do the site maths for you

Calculators for materials, design checks and pricing, built around UK products and regulations. Use them on your phone at the merchant's counter or on site.

Materials calculators

How much to order, with UK product sizes and a sensible waste allowance.

ConcreteVolume in m³, plus cement bags and ballast, or bagged pre-mix, for slabs, footings and posts.Brick and blockBricks, blocks, wall ties, cement and sand for any wall, including cavity walls.RoofingRoof area from span and pitch, then tiles or slates, battens, membrane and ridge tiles.PaintLitres and tins for walls and ceilings, with coats, doors, windows and a mist coat.Excavation and muck-awayDig volume, bulked spoil, tonnes, skips and grab lorry loads for trenches and bases.

Design checks

Quick checks against UK rules before you go to Building Control or an engineer.

StairRisers, rise, going, pitch and stringer length, checked against Part K for houses.Beam load and steel sizeLoads, bending moment, shear and the minimum steel section properties for a simple beam.

Money

Price jobs properly: labour, markup and margin, and VAT.

Labour costDays on site and labour cost from quantities, output rates, gang size and day rates.Job price and profitPrice a job from costs with a markup or target margin, and see the real profit.VATAdd or take off VAT at 20%, 5% or 0%, with notes on construction VAT rules.

AI tools

Paperwork helpers for quotes, safety and site records. Free with a daily limit.

Coming soonQuote generatorDescribe the job in plain words and get an itemised quote to edit and send.

Coming soonToolbox talksA five-minute safety talk on any topic, with a sign-off sheet.

Coming soonSite diaryTurn quick notes or voice memos into a dated daily site record.

Coming soonVariation ordersWrite up a change to the job with its cost and time impact.

Pro tools

Planned paid tools for trades who want to save hours on admin each week.

Coming soonRisk assessment generatorA task-specific risk assessment ready for review.

Coming soonMethod statement generatorA RAMS-ready method statement from a few answers.

Coming soonContract checkerFlags payment, retention and liability clauses to ask about.

Coming soonBuilding Regs helperAnswers pointing to the right Approved Document.

Coming soonPlanning helperPermitted development checks for common projects.

Coming soonMaterial cost trackerLog merchant prices per job and see what is rising.

Coming soonProject dashboardJobs, quotes, variations and diary in one place.

How these tools work

Every calculator shows its working, the figures it assumes and a worked example, so you can check the answer. Results are estimates to help you order and price: check quantities with your supplier, and designs with Building Control or a qualified engineer.