For your website

Free construction calculators for your website

18 calculators any website can show its visitors - bricks and mortar, concrete, plasterboard, roof tiles, cable sizes, drainage falls, day rates and margins. Copy the code, paste it into your page, and it works: on phones, with no sign-up and nothing uploaded.

How to add one

  1. Pick a calculator below and press Copy the code.
  2. In your website's editor, add an HTML or embed block where you want it.
  3. Paste the code and publish. Keep the line under the calculator that says where it's from.

Building materials

Brick & Block Calculator

Bricks, blocks and mortar for a whole job

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Mortar Mix Calculator

Sand, cement and lime for a mortar mix

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Concrete Volume Calculator

Concrete for slabs, footings and columns

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Plasterboard Calculator

Plasterboard sheets, screws and jointing

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Insulation Calculator

Insulation quantities and U-values

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Roof Tile & Batten Calculator

Tiles, battens and felt for a roof

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Flooring Quantity Calculator

Tiles, laminate, vinyl or carpet for any room

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Paint Coverage Calculator

How much paint or render to buy

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Rebar Weight Calculator

Rebar weights from a bar schedule

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Scaffolding Quantity Calculator

Scaffold tubes, boards and fittings from an elevation

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Skip Size Estimator

Pick the right skip for the job

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Electrical and drainage

Cable Sizing Calculator

Size cables for current and voltage drop

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Drainage Fall Calculator

Pipe falls and gradients for drainage runs

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Running the business

Day Rate Calculator

Work out a day rate that pays

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Profit Margin & Markup Calculator

Convert between cost, price, margin and markup

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Break-Even Calculator

How much you need to sell to break even

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Late Payment Interest Calculator

Interest and compensation on late invoices

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Business Loan Repayment Calculator

Repayments and interest on a business loan

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Frequently asked questions

Is it free to put these on my website?

Yes. There's no charge, no account and no limit on visitors. Keep the line under the calculator that says where it's from.

Will it work on my WordPress, Wix or Squarespace site?

Yes - paste the code into a Custom HTML block (WordPress), an Embed code element (Wix) or a Code block (Squarespace).

Does it work on phones?

Yes. The calculator fits the width of the page, and scrolls inside its frame.

What do you collect from my visitors?

Nothing they type leaves their device. The calculator sends anonymous usage counts - no names, no email, no cookies across sites - and visitors can opt out from the line at the bottom. See the privacy policy.

Can I change the height?

Yes - change height="760" in the code to whatever suits your page.