When you look at your UPS invoice and the total is higher than the rate quoted at label creation, UPS fuel surcharges are almost always a contributing factor. For Shopify merchants shipping at any meaningful volume, these percentage-based additions to base rates represent a real and recurring cost that changes every week. Understanding how UPS fuel surcharges work, how they’re calculated, which services they apply to, and how frequently they change is the first step toward building accurate shipping margins into your Shopify store. How UPS Calculates Fuel Surcharges: The Index-Based Model UPS Fuel Surcharge Types by Service Category in Shopify Which UPS Services Are Affected by Fuel Surcharges on Shopify? How Fuel Surcharges Stack with Other UPS Charges in Shopify Display Accurate UPS Rates in Shopify with the PH Multi-Carrier Shipping Label App Conclusion FAQ What Are UPS Fuel Surcharges and Why Do They Exist?