A CoG or center of gravity study gives you the most defensible answer available to one of the most consequential questions in supply chain design: where should my distribution center be?
But that answer has a shelf life.
The math behind a CoG study is only as current as the demand data behind it. When the business that generated that data looks meaningfully different from the business you’re running today, the CoG result starts to drift. Not always dramatically, and not always immediately, but enough to matter when lease decisions, capacity investments, and service commitments are on the line.
Customer growth is one of the most common reasons a center of gravity shifts, and one of the most underappreciated. Here’s why it happens and how to know when it’s time to take another look.
Your CoG Is a Snapshot, Not a Permanent Answer
When a center of gravity study is conducted, it reflects the geographic distribution of demand at a specific point in time. Customer locations, order volumes by region, and freight costs all go into the model. The output tells you where a DC should be positioned to minimize total transportation cost given that demand picture.
The problem is that demand pictures change. Companies grow into new markets. They add product lines that attract different customer segments. They win national accounts that shift the volume concentration from one coast to another. They make acquisitions that bring in an entirely new customer base in a geography they barely served before.
Each of these changes moves the mathematical center of gravity. Sometimes the shift is modest and the existing network still performs well. Sometimes it’s significant enough that a facility location that made sense five years ago is now meaningfully out of position, generating freight costs that a better-placed DC would avoid.
The Ways Customer Growth Shifts the Math
Not all growth moves the CoG in the same direction or by the same magnitude. A few patterns are worth understanding.
Geographic expansion into new regions. When a company that was primarily regional grows into national distribution, the CoG typically moves toward the center of the country. A business that started in the Northeast and now ships significant volume to the Southeast, Midwest, and West Coast is pulling its optimal DC location in directions the original study didn’t anticipate. A single DC that was well-positioned for a regional footprint may now be generating avoidable freight cost on every western shipment.
Disproportionate growth in a specific market. Not all growth is evenly distributed. A company that wins a major account concentrated in a single metro area, or that experiences outsized e-commerce growth in a region it previously underserved, will see that new demand volume pull the CoG toward that geography. The more significant the volume concentration, the stronger the pull.
Acquisition of a new customer base. Post-acquisition scenarios are among the most common triggers for CoG re-evaluation. When two customer bases are combined, the center of gravity for the merged entity often sits in a different location than either standalone business would have suggested. The combined demand picture may point to a facility location that neither network was designed around.
Shifts in order profile, not just location. Customer growth sometimes changes not just where demand is, but what it looks like. A shift from pallet-level B2B orders to individual unit e-commerce fulfillment changes freight cost structures in ways that affect where the optimal DC sits. Higher parcel volumes, tighter delivery windows, and different carrier economics all feed into the CoG calculation differently than truckload or LTL-dominant order profiles.
Why Companies Don’t Catch It Sooner
The most common reason a CoG drift goes unnoticed is that the costs accumulate gradually. No single quarter looks dramatically different from the last. Freight spend grows, but it’s attributed to rate increases or volume growth rather than a network that’s drifting out of position. The original CoG study sits in a folder somewhere, its conclusions treated as settled even as the business it was built on continues to evolve.
There’s also a natural reluctance to revisit a decision that involved real effort and real commitment. If you signed a ten-year lease based on a CoG study, acknowledging that the CoG has shifted doesn’t automatically mean the lease was a mistake. But it does mean you need a clear-eyed view of where you stand before the next decision point arrives.
Lease expirations, capacity constraints, and service level pressures are typically what force the conversation. By that point, the CoG may have shifted enough that the right answer looks quite different from what the original study found.
The Triggers Worth Paying Attention To
A few specific signals suggest it may be time to revisit a center of gravity study:
Volume has grown significantly since the last study. If your order volume has doubled or your customer count has expanded substantially, the demand inputs that drove your original CoG result no longer represent your business accurately.
You’ve entered new markets or geographies. Any time the geographic footprint of your customer base changes materially, the CoG calculation changes with it. New regional markets, expanded national reach, and international growth all shift the demand picture.
You’ve completed an acquisition. Combining two customer bases almost always warrants a fresh CoG analysis. The merged demand picture is a new input, and it should produce a network recommendation built for the combined business rather than either predecessor.
Freight spend is growing faster than volume. When transportation costs are rising at a rate that outpaces order growth, it’s worth asking whether the network is still positioned correctly. A CoG study is one of the most direct ways to answer that question.
A major lease decision is approaching. The period before a lease renewal or a new facility commitment is exactly when updated CoG analysis pays for itself. Signing another long-term commitment without knowing whether your center of gravity has shifted is a risk that’s easy to avoid.
Keeping the Network Aligned With the Business
A center of gravity study isn’t a one-time exercise. It’s a tool that should be revisited as the business that depends on it continues to grow and change. Companies that treat their CoG result as a permanent answer tend to find out it wasn’t when the cost shows up on a freight invoice or a service problem surfaces in a region the network was never really built to serve.
The businesses that stay ahead of it are the ones that recognize growth as a trigger for re-evaluation, not just a reason to celebrate.
How OPSdesign Can Help
OPSdesign conducts center of gravity studies for companies at every stage of growth, whether you’re running your first analysis or revisiting one that no longer reflects the business you’re running today.
If your customer base has grown or shifted and you’re not sure whether your network has kept up, we can help you find out.
