Precast Mix Calculator


Eliminate mixing mistakes and inconsistencies. This easy-to-use mix calculator, in the form of an Excel spreadsheet, calculates exactly how much of each ingredient, including pigments and decorative glass, and produces a printable batch report for you to use while mixing. It even comes with sample colors to get you started. It also includes a grout calculator and a calculator for how much ice to use if you need to cool your concrete in hot weather.

The calculator contains formulas for 2 very different from-scratch concrete countertop mixes:

  • An all-sand mix that produces a stiff consistency perfect for a variegated look
  • An aggregate-based, high slump mix perfect for vibration and a uniform look

These mixes achieve compressive strengths of over 4000 PSI in 1 day, 6200 PSI in 3 days, and 8200 PSI in 7 days.

Calculator comes as downloadable Microsoft Excel spreadsheet. Compatible with Windows programs and can be used on a Mac with Microsoft Excel emulator.