In the product’s description, you’ll often find a square footage amount that indicates the extender’s coverage range. If you opt for an extender, you can expect to extend coverage by about 1,200 square feet. If you purchase an extender with 1,200 square feet of coverage, that coverage is in addition to your router, so if your router provides 2,000 square feet of coverage, you can expect about 3,200 square feet of total coverage—assuming you place the Wi-Fi extender at the very edge of your existing router's range. In most cases, you'll likely end up with some overlap.