The 'Sagulator' – The Shelf Sag Calculator
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Check out this handy guide for calculating whether your shelf will look as straight as a Die – or as saggy as a pair of old knickers.
The Sagulator helps you design shelves by calculating the shelf sag (deflection) of the shelf given the type of shelf material, shelf load, load distribution, dimensions, and method of attachment. You can also specify an edging strip to further stiffen the shelf.