Expert Guide
Steel / Rebar Calculators
Rebar Hook & Crank Weight – Precise Estimator
Quality Inspector
Account for the extra steel weight used in hooks, cranks, and overlaps.
📐 Formula & Method
Hook length is 9d per hook. Crank extra length is 0.42 × depth. Weight is calculated using D²/162.2.
Hook Length = 9 × D
Crank Extra = 0.42 × H
📋 Worked Example
10 bars (12mm) with 2 hooks (108mm each): • Hook Weight = 10 × 0.216m × 0.888kg/m ≈ 1.9 kg
❓ Frequently Asked Questions
Crank bars are reinforcement bars bent up near support points to handle negative bending moments in slabs and beams.
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