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

1998 1997 1996 1995 1994 ------ ------ ------ ------ ------ EARNINGS Income from continuing operations before income taxes, minority interest and extraordinary loss* $1,952 $3,440 $2,479 $2,168 $2,011 Add: Interest on debt 139 94 79 102 70 Interest component of the ESOP benefit expense 29 32 34 37 39 Portion of rent under operating leases representative of the interest component 41 41 46 51 46 Less: Equity in undistributed income of 20-50 percent owned companies 4 3 - 1 2 TOTAL EARNINGS AVAILABLE FOR FIXED CHARGES $2,157 $3,604 $2,638 $2,357 $2,164 FIXED CHARGES Interest on debt 139 94 79 102 70 Interest component of the ESOP benefit expense 29 32 34 37 39 Portion of rent under operating leases representative of the interest component 41 41 46 51 46 TOTAL FIXED CHARGES $ 209 $ 167 $ 159 $ 190 $ 155 RATIO OF EARNINGS TO FIXED CHARGES 10.32 21.58 16.59 12.41 13.96 * 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. These items are discussed in the Notes to Consolidated Financial Statements. 1995 includes a pre-tax restructuring charge of $79 million.