Terms of use

The tools and materials provided from this page have been designed (on the whole) for engineers and are not neccessarily designed for end user operation.

They may require engineering judgment and personal verification of provided data. Although I have worked hard and made these tools as accurate and functional as possible, I provide no warranty on their accuracy or suitability.

All tools used from this page are done so at the user's own risk.

Inline with BS442, this calculator starts with Δ50°C TBSE. You can change this by clicking here.

Book = 50 - Actual = Δ°


If the space requires W, working the Δ backward, you need to have a book value rad at W.


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Updated 14 October 2025 in general tools.

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