METRIC DESIGN GUIDE
Civil/Concrete
Concrete strength is specified in MPa. The following strengths, which are used in Canada,
may be used in metric construction. It is a good practice to use round numbers so that
additional accuracy over English designations is not implied. The general purpose
concrete strengths are reduced from six strengths to four strengths. Strengths above 35
MPa can be specified in 5 MPa intervals (40, 45, 50, 55, etc.). ACI 318 M, which is the
metric version, is now used as a standard.
Exact
Previous
Conversion
Specify
psi
MPa
MPa
2 500
17.23
20
3 000
20.67 20 or 25 (See
note
below)
3 500
24.12
25
4 000
27.56
30
4 500
31.01
35
5 000
34.45
35
Note: If code requires 3 000 psi, then 25 MPa must be used; otherwise, it is a professional
judgment on 20 or 25.
Page 17
PBS-PQ260
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