Rebar Calculator
Estimate reinforcing bar requirements for concrete projects
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Frequently Asked Questions
How do I calculate rebar spacing?
Number of bars = (Length in inches / Spacing) + 1. Add 10-30% for overlap at connections.
What are standard rebar sizes?
Common sizes include #3 (3/8″), #4 (1/2″), up to #18 (2+1/4″) for heavy structures.
Why do rebar bars overlap?
Overlaps help transfer loads between bars and create a unified structural framework within the concrete.
Can rebar be cut to size on site?
Dedicated rebar cutters can make clean cuts. Never use thermic lances or burning torches on structural rebar.
What other factors affect rebar requirements?
Thickness of the slab, seismic zone code requirements, and rebar pattern design.