Research
Original datasets SlabCalc builds and maintains from primary government and scientific sources — free to cite, reference, and reuse.
The SlabCalc Concrete Cost Index
Professional installed concrete costs across US metros, built from state DOT bid-tabulation records rather than contractor-submitted estimates.
Last updated: May 15, 2026
The SlabCalc Freeze-Thaw Index
Mean annual air freeze-thaw cycle counts for 180 US cities, derived from NOAA GHCN-Daily station records, with recommended concrete air content by city.
Last updated: September 17, 2026