Pounds per cubic inch to tonnes per cubic meter conversion calculator above calculates how many tonnes per cubic meter are in 'X' pounds per cubic inch (where 'X' is the number of pounds per cubic inch to convert to tonnes per cubic meter). In order to convert a value from pounds per cubic inch to tonnes per cubic meter (from lb/cu in to t/m³) just type the number of lb/cu in to be converted to t/m³ and then click on the 'convert' button.