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Rebar Development Length Calculator

Calculate tension, compression, hooked, and headed bar development lengths per ACI 318-19 Chapter 25 with all modification factors and lap splice lengths

ACI 318-19 Ch.25DPT 1008-61Hooks & Headed BarsLap Splice Calculator

Calculation results are decision-support tools. The design engineer must review and verify all results independently.

Design Code

Bar Selection

Bar Size

Bar Type

Bar Conditions

Bar Location

Bar Coating

Concrete Weight

Materials

Concrete Grade

Steel Grade

Cover & Spacing

Clear Cover (mm)

Concrete cover to nearest bar surface

Clear Spacing (mm)

Center-to-center spacing minus bar diameter

Use simplified method (Ktr = 0)

Conservative: assumes no transverse reinforcement contribution

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Ready to Calculate

Select a bar size, set conditions, and click Calculate