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

1999 1998 1997 1996 1995 EARNINGS Income from continuing operations before income taxes, minority interest and extraordinary loss* $2,880 $1,952 $3,440 $2,479 $2,168 Add: Interest on debt 109 139 94 79 102 Interest component of the ESOP benefit expense 21 29 32 34 37 Portion of rent under operating leases representative of the interest component 37 41 41 46 51 Less: Equity in undistributed income of 20-50 percent owned companies 4 4 3 - 1 TOTAL EARNINGS AVAILABLE FOR FIXED CHARGES $3,043 $2,157 $3,604 $2,638 $2,357 FIXED CHARGES Interest on debt 109 139 94 79 102 Interest component of the ESOP benefit expense 21 29 32 34 37 Portion of rent under operating leases representative of the interest component 37 41 41 46 51 TOTAL FIXED CHARGES $ 167 $ 209 $ 167 $ 159 $ 190 RATIO OF EARNINGS TO FIXED CHARGES 18.22 10.32 21.58 16.59 12.41 * 1999 includes a non-recurring net 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. 1995 includes a pre-tax restructuring charge of $79 million.