RC Airplane CG Calculator

A Tool For Balancing your Model

AMA 4204

Jun 14, 2025

Enter values to see results.

Image Key

(A) Tip of spinner or motor shaft
(B) Center of main landing gear
(C) CG per plan
(D) Center of tail wheel or nose wheel (depending on gear type)

Follow These Directions for Use:

You will need:
- At least 2 scales like this
- Measuring tape
- Scissor lift or method to level model
- Pen and paper
Set plane level in flying attitude
Place model on scales
Select gear type
Choose inches or mm
Measure A-B, A-D, A-C distances
Enter weights and distances
Enter available correction distance

Fraction to Decimal Converter

If you need to convert a fraction to decimal for the CG Limit input, use this tool:

Enter a fraction or mixed number:

Data Input:

Main Gear Distance from Prop Spinner Tip (From A to B) (in): Nose Gear Distance from Prop Spinner Tip (From A to D) (in): Target CG from Spinner (From A to C) (in): Main Gear Weight (oz): Nose Gear Weight (oz):

Available Distance from CG for Weight Placement (in):

This should be adjusted to an area that weight can be added

This is the distance away from the CG you can/will install the weight

CG Forward Limit:

CG Aft Limit:

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