Indicative onlyThese tools provide indicative calculations only. No warranty is given as to the accuracy, completeness or fitness for purpose of any output. Using this site does not create a professional relationship or duty of care between brickdims and the user. Results must not be used as a substitute for professional advice, site-specific assessment, or formal compliance sign-off. Building regulations are subject to change, so always verify against the current editions of the relevant Approved Documents and consult a building control officer where required. brickdims accepts no liability for any loss, damage or non-compliance arising from reliance on these tools, to the fullest extent permitted by law. If any part of these terms is found unenforceable, the remaining terms continue to apply. These terms are governed by the laws of England and Wales. By using this site you accept these terms.
Block dimensions
Calculate horizontal and vertical block dimensions for various block types. Input through either sliding scale, target dimension or difference between two dimensions/ levels.
Results from brickdims.com tools are indicative only. Using this site does not create a professional relationship or duty of care. Not a substitute for professional advice or formal compliance sign-off.
Block settings
Horizontal
Vertical
Stretcher bond - Wall preview
Horizontal: 2,250mm (CO), Vertical: 900mm (CO)
BlockMortar
FAQs
What size is a standard concrete block?
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The standard UK block face is 440mm long by 215mm high, usually 100mm or 140mm thick. With 10mm joints its coordinating size is 450 × 225mm.
How many blocks are there in a square metre?
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About 10 standard blocks, since each block and its joints cover 450 × 225mm. Add an allowance for cuts and breakages when ordering.
Do block courses line up with brick courses?
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Yes, with standard 10mm joints. One block course is 225mm, which is exactly three brick courses of 75mm, so the two leaves of a cavity wall line up every 225mm.