Accurate calculation of enclosure volume is essential in designing a properly functioning subwoofer. These calculators will calculate the volume for square, rectangular, triangular, trapezoidal and cylinder tube subwoofer enclosures, sealed or ported, including driver volume, bracing volume and port volume displacement. These calculators will operate with both fractions (1/4, 1/2, 3/4, etc.) and decimals (.25, .50, .75 etc.).