About Rebar Calculator
Calculate reinforcing steel rebar length, grid pieces, and total weight in kg and pounds.. Designed for accurate, instantaneous calculations with zero wait time.
Formula
Rebar Length = (Grid Rows × Slab Length) + (Grid Cols × Slab Width) + Lap Splices
Example Calculation
A 20ft × 20ft slab with 12" grid spacing needs ~880 linear feet of #4 rebar (~588 lbs).
How to Use
- Enter your values into the form fields above.
- The calculation updates immediately in real time.
- Inspect the main summary and secondary breakdowns below.