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The flat size your load actually needs
A tarp is bought flat and used draped: the flat width must cover the load and hang down both sides. Enter your load, get the arithmetic, and see which published formats cover it. The tool never invents a format: when nothing published fits, it says custom, and the dimension sheet goes on the quote.
Your load
The drop must reach at least this far down to protect the bottom of the load.
Arithmetic on your numbers, published formats from dated US listings, nothing else.
What the job needs
Fill in the three dimensions to see the result.
Published formats against this need
First personal reply within 2 business days, with clarifying questions or next steps.
How the arithmetic works, in the open
Flat width needed = load width + 2 x drop, where the drop is at least your load height. The length must cover the load; on lumber tarps the end flap covers the front face, which is why published lumber formats state their flap separately. That is the whole formula; there is no hidden coefficient.
Coils are the exception: a coil tarp is shaped to the coil, so the published cube format matters less than your coil dimensions (width, diameter). State them on the quote and the dimension sheet does the rest.