Rebar Calculator
Enter slab dimensions, bar spacing, cover, stock length, lap, bar size, and waste to prepare a material takeoff.
Open Rebar CalculatorNo signup required · Updates as you type
From measurements to an order-ready estimate
- Enter slab length, width, spacing, and concrete cover.
- Choose bar size, stock length, lap allowance, and grid direction.
- Review bar counts, installed length, stock pieces, and order weight.
Before you order
Use field measurements and supplier specifications
TerraCalc does not provide structural design. Use spacing, cover, bar size, lap, and layers from approved plans or a qualified design professional.
Rebar Calculator questions
Does TerraCalc add waste?
Yes. You control the waste allowance so the estimate can reflect cuts, spill, settlement, compaction, laps, or other project conditions.
Can I use metric measurements?
Yes. TerraCalc supports imperial and metric inputs for its material and reinforcement calculators.
Should I verify the result?
Yes. Recheck site measurements and confirm density, package size, selling increment, product specification, and delivery limits with the supplier or project professional.