buildercalc
Calculators Grid
Concrete & Masonry
Concrete Volume
Slab · Driveway · Footing · Bags
Rebar Weight
For a Slab · #4 Size
Brick & Mortar Aggregate / Gravel View all Concrete ›
Roofing & Framing
Roof Pitch
4/12 Pitch · Rafters · Area
Lumber Board Feet
2×4 · 2×6
Stair Stringer Fence Posts View all Roofing ›
Design & Finishes
Flooring Estimator
Hardwood · Laminate · LVP · Carpet
Tile & Grout Drywall Paint Coverage Wallpaper Fabric Yardage View all Design ›
Mechanical & Solar
Tank Volume
275-Gal · Partial-Fill · Pool
Solar Panel Angle
Winter · By City
Gear Ratio Voltage Drop HVAC BTU Plant Spacing Freight Class Home Rebuild Browse all Hubs ›
Guides Glossary Methodology About Us Contact Us
Metric Units

Engineering Crosswalks & References

Comparison tables bridging regional code standards, unit dimensions, and shipping density brackets.

US ASTM vs Metric Rebar Size Crosswalk Table

Engineering crosswalk comparing imperial US rebar size numbers (#3 to #18) to international nominal millimeter diameters under ISO, BS, and SASO standards.

LTL Freight Class Density Breakpoints Crosswalk Table

Logistics planning crosswalk mapping Pounds per Cubic Foot (PCF) shipment density values to NMFC Freight Classes 50 through 500.