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Rebar lap length calculator

Tension lap and development length to ACI 318 or Eurocode 2. Use it to check what you measure on site, then confirm against the approved drawings.

Your bar

ACI 318 Eurocode 2

Bar diameter (mm) Concrete strength (MPa)Cylinder f'c Steel yield (MPa)

Bar position Coating Spacing and cover Concrete Lap class

Minimum tension lap—

Development / anchorage length—

Free rebar inspection checklist

The 31-point checklist I use before every concrete pour: documents, material, spacing, laps, cover, fixing and embedded items, with a measurement record and sign-off boxes. Two A4 pages, ready to print.

Preview of the rebar inspection checklist

Download the free PDF

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