Contact

Corrections, suggestions and enquiries are all welcome.

Found a mistake in a calculation?

Please tell us — this is the most useful message you can send. Include the numbers you entered, the units you selected, the result you got and the result you expected. That is usually enough to reproduce it immediately.

Want a calculator we don't have?

We are adding calculators based on what people actually ask for. Footings, driveways, slabs with thickened edges, gravel, road base, mulch and soil are all on the list. If you need one, say so and it moves up.

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What we can't help with

We cannot advise on slab thickness, reinforcement, concrete strength class, footing design or whether a particular job meets code. Those questions need someone who can assess your site and take professional responsibility for the answer — your concreter, builder, or a structural engineer.