Rebar Spacing Calculator
One-direction count: floor(span ÷ spacing) + 1.
Step 1: Units
Step 2
Enter project measurements
Use decimals if needed (e.g. 3.5).
How to use this calculator
Enter clear span and bar spacing on center for one mat direction.
What the math is doing
Bars = floor(length ÷ spacing) + 1.
Frequently asked questions
Two directions?
Run twice or double if identical.
Edge bar?
Often included in +1 rule.
Laps?
Add bar length at supplier.
Epoxy dowels?
Different SKU than straight bar.