Engineering Tools

Rebar DevelopmentLength

Calculate required rebar development length per ACI 318. Determine proper embedment for reinforcing steel in concrete structures.

Development Length Calculation

Development Requirements

Ld (Tension)25.4inches
Ld (Compression)17.2inches

Rebar Properties

Bar Diameter0.75 in
Bar Area0.44 in²
Basic Ld factor21.3
Modification Factors1.3
Minimum per ACI 31812 in

ACI 318 Requirements

  • Minimum Ld = 12 inches
  • Top bars: ×1.3 multiplier
  • Epoxy coated: ×1.2-1.5
  • Lightweight: ×1.3

Typical Ld Values

  • #4 @ 4ksi: ~12"
  • #6 @ 4ksi: ~24"
  • #8 @ 4ksi: ~38"
  • #11 @ 4ksi: ~58"

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