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A calculation looks wrong
Use the correction form. It captures the calculator, the region and what you expected, which is everything needed to reproduce it.
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Read the privacy page →Please include the calculator name, the region and the numbers you entered if you are writing about a result. Screenshots help, but the actual input values help more.
What we cannot help with
We cannot give structural advice, confirm whether your project needs building regulations approval or planning permission, or tell you whether a particular design is safe. Those need someone who can see the site. See the disclaimer for what these calculators do and do not cover.