EXHIBIT 12 MINNESOTA MINING AND MANUFACTURING COMPANY AND SUBSIDIARIES CALCULATION OF THE RATIO OF EARNINGS TO FIXED CHARGES (Dollars in millions) (Unaudited)

Six Months Ended June 30, Year Year Year Year Year 2001 2000 1999 1998 1997 1996 ------- ------ ------ ------ ------ ------ EARNINGS Income from continuing operations before income taxes, minority interest, extraordinary loss and cumulative effect of accounting change* $1,021 $2,974 $2,880 $1,952 $3,440 $2,479 Add: Interest expense 81 127 109 139 94 79 Interest component of the ESOP benefit expense 9 19 21 29 32 34 Portion of rent under operating leases representative of the interest component 20 39 37 41 41 46 Less: Equity in undistributed income of 20-50% owned companies 1 10 4 4 3 -- ------ ------ ------ ------ ------ ------ TOTAL EARNINGS AVAILABLE FOR FIXED CHARGES $1,130 $3,149 $3,043 $2,157 $3,604 $2,638 ------ ------ ------ ------ ------ ------ FIXED CHARGES Interest on debt 83 141 109 139 94 79 Interest component of the ESOP benefit expense 9 19 21 29 32 34 Portion of rent under operating leases representative of the interest component 20 39 37 41 41 46 ------ ------ ------ ------ ------ ------ TOTAL FIXED CHARGES $ 112 $ 199 $ 167 $ 209 $ 167 $ 159 ------ ------ ------ ------ ------ ------ RATIO OF EARNINGS TO FIXED CHARGES 10.1 15.8 18.2 10.3 21.6 16.6 *Six months ended June 30, 2001, includes a non-recurring net pre-tax loss of $420 million; 2000 includes a non-recurring net pre-tax loss of $23 million; 1999 includes non-recurring net pre-tax gains of $100 million; 1998 includes a non-recurring pre-tax restructuring charge of $493 million; 1997 includes a non-recurring pre-tax gain on the sale of National Advertising Company of $803 million.