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Truss Plate (MPC) Connector Sizing Calculator

Estimate required metal connector plate area per truss joint from joint load and rated tooth capacity.

Computed in your browser — nothing you enter is uploaded. Figures are presented for United States against IRC 2024, and every formula is cited under regulatory standards below.

Last verified 2026-08-26 · v1.0.0

Market
Imperial · sales tax

Plate area needed (each side)

31 in²

Check your inputs

Use your specific plate manufacturer's ANSI/TPI 1 rated tooth capacity — this value varies significantly by plate gauge, tooth pattern, and wood species.

Total area (both side plates)
62 in²

For the dimensions entered, expect a plate area needed (each side) of 200 cm². Of the working steps, total area (both side plates) dominates at 400 cm². Moderate confidence — sound arithmetic, but allow for the variation any real site introduces. Set for United States against IRC 2024. The market selector changes both the units and the code cited.

Add the equipment this sizes

This result is a specification — 31 in² — not a quantity. Put the thing it sizes into your project: how many, what you call it, and your supplier’s price.

Preliminary estimate, not certified engineering. This tool produces an indicative quantity calculation for planning purposes only — it is not a certified structural analysis, a guaranteed material takeoff, or a substitute for building department approval. Always verify measurements on-site and have a licensed contractor or structural engineer review any load-bearing, code-sensitive, or safety-critical work before purchasing materials or starting construction. Spotted an arithmetic or standards error? Report it to contact@craftquantities.com with your inputs — confirmed fixes become pinned regression tests.

[Schema Verified] Computed in alignment with American Concrete Institute (ACI 318-19) formulas and International Residential Code (IRC 2024) spatial boundaries.

Regulatory standards & verification citations

  • Metal plate connector (MPC) capacity is governed by manufacturer-tested tooth values per the Truss Plate Institute (ANSI/TPI 1) — this calculator divides your required joint load by your own plate's rated capacity-per-area to estimate the plate area needed, applied to each of the two side plates

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Frequently asked questions

Why is capacity divided across two side plates?
A truss joint connection is made with a metal plate connector pressed into each face of the wood members at the joint, so the total required plate area is shared equally between the two side plates rather than provided on a single face.
Where does the plate's rated capacity-per-area come from?
It comes from the specific plate manufacturer's ANSI/TPI 1 evaluation testing, which establishes tooth (pull-out) and steel capacity values for that plate's gauge and tooth pattern — it is not a generic industry-wide constant.
Does this account for both tooth capacity and steel (net section) capacity?
No — this calculator applies a single capacity-per-area value you supply. A complete ANSI/TPI 1 truss plate design checks both the tooth capacity into the wood and the steel plate's own net section and shear capacity separately.