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

Six Months Ended June 30, 1993 1992 1991 1990 1989 1988 EARNINGS ------------------ - - ------ ------ ------ ------ ------ Income Before Income Taxes, Minority Interest and Cumulative Effect of Accounting Changes $1,050 $1,947 $1,877 $2,135 $2,099 $1,985 Add: Interest on debt 26 76 97 98 98 99 Interest component of the ESOP benefit expense 21 42 44 45 - - Portion of rent under operating leases representative of the interest component 23 47 47 44 35 36 Less: Equity in undistributed income of 20-50% owned companies - (1) (6) 1 4 11 ------ - - ------ ------ ------ ------ ------ TOTAL EARNINGS AVAILABLE $1,120 $2,113 $2,071 $2,321 $2,228 $2,109 FOR FIXED CHARGES ====== ====== ====== ====== ====== ====== FIXED CHARGES Interest on debt $26 $76 $97 $98 $98 $99 Interest component of the ESOP benefit expense 21 42 44 45 - - Portion of rent under operating leases representative of the interest component 23 47 47 44 35 36 ------ - - ------ ------ ------ ------ ------ TOTAL FIXED CHARGES $70 $165 $188 $187 $133 $135 ====== ====== ====== ====== ====== ====== RATIO OF EARNINGS TO FIXED CHARGES 16.00 12.81 11.02 12.42 16.75 15.62