1. Logo area
If you’re using the boxed layout, you’ve got 940px to work with.
2. Slider full width
3. Slider half width (pic on the left or right)
Head over to the Item Details page for this product on ThemeForest and look under the title “Image Sizes” — Here you’ll find a list of all the theme’s image crop sizes.
4. Sidebar dimensions
On the standard Sidebar Right/Left layouts, the sidebar comes out to about 280px before the browser scales down responsively.
Here’s how you can quickly figure things out like this with Google Chrome’s web inspector —