Compute tension and compression lap splice lengths for deformed reinforcing bars per ACI 318-19M Section 25.5. All modification factors (ψt, ψe, ψs, ψg, λ) applied automatically.
A complete lap splice design toolset for deformed reinforcing bars in tension and compression.
Class A (1.0 ld) and Class B (1.3 ld) tension splices per ACI 318-19M Table 25.5.2.1.
Compression splice lengths per ACI 318-19M Section 25.5.5 with fy- and f'c-based minimums.
ψt top bar, ψe epoxy, ψs size, ψg grade, and λ lightweight applied per ACI 25.4.2.
Automatic √f'c cap and correction for concrete with f'c < 21 MPa.
Full metric rebar range: 10M, 15M, 20M, 25M, 30M, and 36M deformed bars with accurate db values.
Supports Grade 400, 420, 500, and 520 MPa reinforcement with the grade factor ψg applied automatically.
Applies the 300 mm tension minimum and all compression splice lower bounds per the code.
Full derivation of ld and ls with every factor, ratio, and governing limit shown transparently.
Consistent metric output in millimetres and megapascals for international engineering practice.
From bar selection to a fully traced splice length in four simple steps.
Pick the deformed bar size (10M–36M) and steel grade (400–520 MPa) being spliced.
Input the specified concrete compressive strength; the calculator applies the √f'c cap automatically.
Select Class A or Class B for tension, or compression splice, and set top-bar, epoxy and lightweight options.
Read the governing splice length together with a complete step-by-step computation report.
Sign in to access the full interactive calculator with every modification factor and a complete step-by-step trace.
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