Shed Material Estimator Calculator

I've been working on a free Shed Material Estimator Calculator and I'd love to get some feedback from people here who actually build sheds.

You can enter the shed dimensions and choose things like the roof, foundation, doors, windows, etc., and it gives you a rough material estimate.

If you've built sheds before, would you mind testing it and letting me know what you think? I'm particularly interested in whether the material estimates make sense and if there's anything you'd add or change.

Thanks

Mark

The Shed Nerd