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How to use: Footing Rebar Calculator
- Enter footing length and width.
- Set spacing and clear cover.
- Choose the bar size for counts and weight.
Formula
Same grid method as a slab: bars one way = floor((dimension − 2 × cover) ÷ spacing) + 1, both directions, × kg/m.
Footing Rebar Calculator — FAQ
What size rebar is used in footings?
10–16 mm (#4–#5) bars are typical for residential footings; design governs.
How do I calculate footing reinforcement?
Treat the footing as a small slab — bar count each way times bar length times the unit weight.