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RC Plane CG Calculator

Express the balance point as a percentage of wing chord from the leading edge.

Reference Chord Mode

The reference chord at the position you measured.

Result

CG position
30.0% of chord
60.00 mm from LE

Percentage applies to the reference chord you entered — not necessarily the MAC. Always check the manufacturer’s recommended CG range.

Formula

  1. 1.CG Percentage = CG Distance / Chord Length × 100

Worked example

  1. 1.Inputs: 200 mm chord, 60 mm CG from leading edge.
  2. 2.CG = 60 / 200 × 100 = 30% of chord.

Assumptions and limits

  • A tapered wing’s MAC is a different chord than the root — do not substitute root chord for MAC without a MAC calculation.
  • Stay inside the kit’s published CG range.

Related tools

Guides and concepts

FAQ

Is 30% always safe?

No — the safe band depends on the design; use the manufacturer figure.

Assumptions

  • Mode A only: CG % of a stated reference chord.
  • MAC mode for tapered wings is not part of this release.