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Construction calculator API: add roofing and material estimates to your app

65 JSON endpoints for roofing, decking, fencing, drywall, insulation, tile, gravel and concrete quantities, imperial or metric. Examples and a free key.

65 JSON endpoints for roofing, decking, fencing, drywall, insulation, tile, gravel and concrete quantities, imperial or metric. Examples and a free key. This guide is part of the Dixon App Studio blog — practical, no-fluff articles for builders, freelancers, home cooks, and sports fans. Read more guides on the blog index, browse our full app lineup, or use one of our free online converters whenever you need a quick answer.

Frequently asked questions

Is there a free plan?

Yes. The Basic plan on RapidAPI is free for testing; paid plans raise the monthly request quota.

Does the API support metric units?

Yes. Add units=metric to any call to send and receive metres, millimetres, square and cubic metres, kilograms, tonnes and litres. Counts and money are never converted.

Which trades does it cover?

Roofing, decking, fencing, drywall, insulation, tile, landscape and aggregates, concrete and paint, plus unit conversions: 65 endpoints in total.

Can I import it into Postman?

Yes. Import the OpenAPI 3.1 file linked from the documentation page.

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