To measure a wall for peel and stick wallpaper accurately and efficiently, follow these steps, which combine insights from the provided search results:

Step 1: Measure the Wall Dimensions

- **Measure the Height and Width**: Use a measuring tape to find the maximum height and width of the wall. It's crucial to measure the height at several points (every 25 inches from left to right) if the wall has any irregularities or if you're dealing with angled walls.

- **Include Obstacles**: When measuring, include any obstacles like doors or windows in your calculations. This ensures you have enough wallpaper to cover the entire area, even though you'll be cutting around these obstacles.

Step 2: Calculate Square Footage

- **Square Footage Formula**: Multiply the height by the width (in inches) to get the total square inches. Then, divide by 144 to convert to square feet. This calculation gives you the total square footage of the wall area you need to cover.

Step 3: Determine Wallpaper Quantity

- **Wallpaper Roll Coverage**: Check the coverage of the peel and stick wallpaper roll you plan to use. Coverage can vary, but a common size is approximately 28 square feet per roll.

- **Number of Rolls**: Divide the total square footage of your wall by the square footage covered by one roll of wallpaper. Always round up to the nearest whole number to ensure you have enough. Consider ordering an extra roll for mistakes or future touch-ups.

Additional Tips

- **Angled and Irregular Walls**: For walls with angles or irregularities, measure the height at multiple points across the width. This helps determine if any panels can be shorter, potentially saving material and cost.

- **Obstacles**: When measuring around doors or windows, consider the possibility of using shorter panels if part of the wall is significantly lower. However, always ensure you have enough material for pattern matching and covering the entire area.

- **Professional Advice**: If unsure, consult with a design consultant or the wallpaper manufacturer. Providing photos or diagrams of your wall can help in getting accurate advice.

By following these steps, you'll accurately measure your wall for peel and stick wallpaper, ensuring you purchase the right amount of material for your project.