Count → Spacing (Equal)
Input L=5000 mm, left=50 mm, right=50 mm, n=11
Result Le=4900 mm, pitch=490 mm, x0=50, x10=4950
Rebar Spacing Calculator
Calculate bar count, spacing, edge offsets, and coordinate lists on one screen.
Supports equal, centered, and one-side flush layouts with URL sharing and CSV/JSON/SVG export.
Switch instantly between count and spacing modes
Export an x-coordinate list and interval table
Share current inputs through a URL
How to use
- Enter total length L and both edge offsets, then confirm effective length Le.
- Choose count → spacing or spacing → count, then enter the required values.
- Pick a layout rule (equal, centered, or one-side flush), then review the summary and coordinates.
- Copy or download CSV/JSON/SVG as needed.
Examples
Spacing → Count (Centered)
Input L=5000 mm, left=50 mm, right=50 mm, pitch=600 mm, round=ceil, layout=centered
Result Count is clamped to fit, and the remainder is split equally on both sides
FAQ
Why can input spacing and effective spacing be different?
In Equal spacing mode, the endpoints stay fixed and spacing is recalculated to divide the effective length evenly.
Can centered or flush mode reduce the count?
Yes. When fixed spacing does not fit, the tool automatically adjusts to the largest count that fits.
What happens when n becomes 1?
Only one bar is placed, so spacing is undefined. A warning appears above the results.
Can this tool validate structural compliance?
No. This tool performs geometric layout calculations only. Check structural validity and code compliance separately.