Rebar Lap-Splice Length Calculator

Estimate rebar development length and Class B tension lap-splice length from bar size, concrete strength, and steel yield strength. Planning estimate only

Frequently Asked Questions

Is this lap-splice result code-compliant?

No. It is a simplified planning estimate only and omits many ACI 318 modification factors for cover, spacing, coating, and confinement. Never build from these numbers.

What is a Class B lap splice?

A Class B tension lap splice is taken here as 1.3 times the development length, with a 12 inch minimum. Always have splice lengths reviewed and stamped by a licensed structural engineer.

Important Disclaimer: Estimates for informational purposes only.

This calculator provides estimates for informational purposes only. Results are based on assumptions and may not reflect actual outcomes. Consult qualified professionals in relevant fields before making important decisions based on these results.