SUMMARYMacroporosity is often used in the determination of soil compaction. Reduced macroporosity can lead to poor drainage, low root aeration and soil degradation. The aim of this study was to develop and test different models to estimate macro and microporosity efficiently, using multiple regression. Ten soils were selected within a large range of textures: sand (Sa) 0.07-0.84; silt 0.03-0.24; clay 0.13-0.78 kg kg -1 and subjected to three compaction levels (three bulk densities, BD). granulométricas -areia: 0,07-0,84; silte: 0,03-0,24; e argila: 0,13-0,78 macro = 0,465 Ds + 0,212 areia; micro = 0,337 + 0,294 areia; Pt = 1,082