Container Center of Gravity Calculator | ContainerMetric
Calculate center of gravity for multi-cargo container loads and verify balance.
Why Container Balance Matters
A container's center of gravity (CoG) is the single point where its total weight effectively acts. The calculator finds it as a weight-weighted average of every item's position: it sums each item's weight multiplied by its coordinate, then divides by the total weight, doing this independently for the lengthwise (front-to-back), crosswise (side-to-side), and vertical axes. Add as many cargo items as you have, each with a weight and an X, Y, and Z position.
The critical axis is lengthwise. This tool treats the load as balanced when the CoG falls between 20% and 80% of the container's internal length — for a 20ft container that internal length is 5.898 m, so the safe band runs from about 1.18 m to 4.72 m from the front wall. A 40ft container is 12.032 m long internally, giving a band of roughly 2.41 m to 9.63 m. A CoG outside this window concentrates load over one end, overstressing an axle or the chassis kingpin.
Keeping the CoG centered and low protects road handling and complies with packing guidance such as the CTU Code. Heavy items should sit on the floor and toward the middle, with lighter cargo above and at the ends. If the calculator reports the load as unbalanced, redistribute the heaviest items toward the center or restow them lower before sealing the doors.
FAQ
Where should the center of gravity sit in a container?
Aim for the lengthwise CoG near the middle. This tool flags a load as balanced when the CoG is between 20% and 80% of the container's internal length, and ideally it should also be kept as low as possible.
What happens if the load is off-center?
An off-center CoG overloads one axle or the chassis kingpin, hurts braking and cornering stability, and can breach axle-weight limits. Shifting heavy items toward the center corrects most imbalances.
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Related Topics
- container CoG calculator
- center of gravity
- cargo balance
- container loading