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The easiest way to calculate a countertop's square footage is to divide your countertop into squares and rectangles, then multiply the length and the width of each piece in inches before adding them together and dividing by 144.

Installing new kitchen countertops costs $1,850 to $4,450, with an average price of $3,140. Some materials, like marble and granite, are more expensive than others. Additionally, the size of the countertop impacts the overall price. Labor accounts for 10% to 20% of the overall project cost. Add-ons, like edging and corner treatments, also increase the cost.

The frequency for sealing granite countertops depends on several factors, including the type of sealant used, the color of the granite, and how heavily the countertops are used. As a general guideline, resealing is often recommended every 12 to 18 months, but some sources suggest it could be as often as every few months or at least once a year.

The type of sealant is a major factor: water-based sealants may need reapplication every six months to a year, while more durable solvent-based sealants can last for five to 10 years. Additionally, factors like heavy kitchen traffic, frequent use of acidic cleaners, and lighter granite colors may require more frequent sealing to prevent staining.

To determine if your countertops need resealing, you can perform a simple water test. Place a few drops of water or a wet paper towel on an inconspicuous area of the granite. After 10 to 15 minutes, check the spot. If the water has beaded up, the seal is still intact. If the water has been absorbed and darkened the stone, it's time to apply a new coat of sealant. You can choose to seal the granite yourself or hire a professional to ensure it's done correctly.

Epoxy is typically more affordable than granite, especially if you’re choosing a high-end slab. Most granite countertops cost $75 to $145 per square foot to install, with high-end varieties topping $185 per square foot. 

In contrast, epoxy countertops cost $50 to $150 per square foot to install. The material costs for epoxy are significantly lower than granite, but installation costs can be higher. Rather than simply cutting granite countertops to size before installation, your contractor will need to carefully pour the epoxy over an existing surface.