Find useful construction reference charts covering sizes, dimensions, spacing, materials, and common jobsite measurements.
188 resources available
How much mixed concrete volume actually comes out of a 40, 50, 60, 80, or 90 lb bag, why standard and high-yield bags of the same…
What bag weights concrete mix is actually sold in, which manufacturer products use which sizes, and how to choose the right package. This chart covers package…
Standard 90-degree, 180-degree, and 135-degree hook geometry for reinforcing bars: minimum bend diameter, straight extension, and detailing dimensions under ACI 318-25 Table 25.3.1 and 25.3.2.
Development length is the embedded length a reinforcing bar needs to develop its yield strength in concrete. There is no single number for a given bar…
![Rebar Size Chart - Complete #3 to No. 20 [64] Diameter, Area & Grade Reference](https://concretecalculate.com/wp-content/uploads/2026/07/Rebar-Size-Chart-2026-Complete-3-to-No.-20-64-Diameter-Area-Grade-Reference-768x402.png)
The most complete rebar size reference for contractors, engineers, and estimators: diameter, area, weight, grades, spacing, cover, and lap splice in one place.
What a U.S. rebar number and ASTM metric designation actually mean, how numbers relate to diameter, why #9 and larger break the simple eighth-inch rule, and…
What lengths rebar actually comes in, a free bars-needed calculator, and how stock length differs from cut length, lap length, and development length.
Nominal diameter for every standard rebar size from #3 to No. 20 [64], why measured outside diameter differs from the listed nominal value, and how to…
A bag of concrete has no fixed square-foot coverage on its own. Coverage depends on the bag's yield and the slab thickness together. This chart uses…
Deck post size is not chosen from deck dimensions alone. Maximum post height depends on post size, lumber species, tributary area and load together, based on…
Aggregate gradation describes the full distribution of particle sizes in a sample, not just its nominal size. This chart provides verified ASTM C33 fine and coarse…
Maximum deck post spacing is controlled by the allowable beam span between supports, not by a fixed universal distance. This chart shows how beam size, species,…