Concrete calculator - cement:s

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Jan 18: You can specify margin of safety (use help for information on this parameter)

Dec 8: Improved algorithm, more than 20 input parameters
Specify the level of density - P1..P5
Specify the use of a waterreduction additive
Calculate the proportions for the concrete based on ready sand and gravel mix
Set the mark on frost-resistance
Set the mark for watertightness
Specify the type and fraction of gravel and sand gradation factor
May also see the weight of components in the calculation results