Rebar Calculator — Fast Takeoffs for Slabs, Footings & Walls
Use this free Rebar Calculator to estimate the number of bars, total linear footage, and steel weight for common concrete elements. Choose Slab, Footing, or Wall, enter your dimensions, spacing, cover, and bar size, and get instant totals in both imperial and metric units. This tool is designed for quick takeoffs — always verify structural requirements with local codes or a licensed engineer.
What It Calculates
- Bar count in each direction/layer
- Total length by bar group and overall
- Total weight in pounds and kilograms
Quick Tips
- Edge offsets start the first bar in from the edge for better cover and spacing.
- Cover is the distance from concrete surface to the steel — common values: slabs 2″ bottom, footings 3″, walls 2″.
- For simple takeoffs, add a small waste allowance (e.g., 5–10%) for cuts and overlaps.
Related Tools
Planning concrete volume as well? Try our Concrete Slab Calculator and Gravel Calculator.
Disclaimer
This tool provides takeoff estimates only and is not a design tool. Reinforcement selection, spacing, laps, development, and detailing must follow applicable codes and a licensed engineer’s direction.