Not all watts are created equal. A speaker’s loudness depends not just on power, but on its sensitivity and your distance from it. This simple tool helps you estimate the Sound Pressure Level (SPL) in decibels, based on your speaker’s wattage, sensitivity rating, and how far you sit from it. Whether you’re shopping for a Bluetooth speaker, setting up a home theater, or just trying to understand how specs translate to real-world volume. This calculator gives you instant, practical answers.