Rebar Calculator — Weight, Length & Spacing
FREEEstimate reinforcing steel in both directions for a simple slab or footing mat. Adjust spacing, bar size, lap allowance, and price per foot to get a fast weight and cost estimate.
Slab / footing layout
Cost & overlap
#3 = 0.376 lb/ft#4 = 0.668 lb/ft#5 = 1.043 lb/ft#6 = 1.502 lb/ft
Linear ft — length direction
0 lf
Linear ft — width direction
0 lf
Total linear ft
0 lf
Weight
0 lb
Weight in tons
0 tons
Estimated steel cost
$0
All calculations happen in your browser. Use these numbers as a fast estimating aid, then verify measurements, local code, supplier pricing, and site-specific conditions before ordering materials or sending a final bid.
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Frequently asked questions
Does this include lap splices?
Yes. Use the lap splice percentage field to add an overlap allowance on top of the clean grid length.
What weights are used?
The tool uses standard nominal weights per linear foot: #3 = 0.376, #4 = 0.668, #5 = 1.043, and #6 = 1.502 lb/ft.
Is this good for engineered structures?
Use it for estimating only. Engineered drawings and project specs always override a quick calculator.