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

Nine Months Ended Sep. 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* $1,620 $2,974 $2,880 $1,952 $3,440 $2,479 Add: Interest expense 113 127 109 139 94 79 Interest component of the ESOP benefit expense 13 19 21 29 32 34 Portion of rent under operating leases representative of the interest component 30 39 37 41 41 46 Less: Equity in undistributed income of 20-50% owned companies 3 10 4 4 3 -- ------ ------ ------ ------ ------ ------ TOTAL EARNINGS AVAILABLE FOR FIXED CHARGES $1,773 $3,149 $3,043 $2,157 $3,604 $2,638 ------ ------ ------ ------ ------ ------ FIXED CHARGES Interest on debt 118 141 109 139 94 79 Interest component of the ESOP benefit expense 13 19 21 29 32 34 Portion of rent under operating leases representative of the interest component 30 39 37 41 41 46 ------ ------ ------ ------ ------ ------ TOTAL FIXED CHARGES $ 161 $ 199 $ 167 $ 209 $ 167 $ 159 ------ ------ ------ ------ ------ ------ RATIO OF EARNINGS TO FIXED CHARGES 11.0 15.8 18.2 10.3 21.6 16.6 *Nine months ended September 30, 2001, includes a non-recurring net pre-tax loss of $489 million; 2000 includes a non-recurring net pre-tax loss of $23 million; 1999 includes a non-recurring net pre-tax gain of $100 million relating to gains on divestitures, litigation expense, an investment valuation adjustment, and a change in estimate that reduced the 1998 restructuring charge; 1998 includes a pre-tax restructuring charge of $493 million; 1997 includes a pre-tax gain on the sale of National Advertising Company of $803 million.