The relationship between the class and concrete grades for strength is given in the table:

 
Euro class | kgf / cm2 | Nearest RUs-GOST

concrete B5 - 65 - concrete M75
concrete B7.5 - 98 - concrete M100
concrete B10 - 131 - concrete M150
concrete B12.5 - 164 - concrete M150
concrete B15 - 196 - concrete M200
concrete B20 - 262 - concrete M250
concrete B25 - 327 - concrete M350
concrete B30 - 393 - concrete M400
concrete B35 - 458 - concrete M450
concrete B40 - 524 - concrete M550
concrete B45 - 589 - concrete M600
concrete B50 - 655 - concrete M600
concrete B55 - 720 - concrete M700
concrete B60 - 786 - concrete M800