Fuel surcharges are one of the most significant, and most misunderstood, components of transportation costs. They shift weekly, vary by carrier, and increasingly operate as a structural pricing lever rather than a simple pass-through of fuel costs.
In theory, surcharges should rise when fuel prices rise and fall when they fall. But, in practice, they've become a significant structural cost—representing a median of about 9%1 of total invoice cost and 15% or more for many shippers. For high-volume operations, even small changes to a carrier's surcharge table can translate to millions of dollars in annual cost variance.
Here's what you need to know.
How fuel surcharges are calculated
All fuel surcharge calculations rely on indices published by the U.S. Energy Information Administration (EIA):
- National U.S. Average On-Highway Diesel Fuel Price is used for ground and trucking services
- U.S. Gulf Coast (USGC) Kerosene-Type Jet Fuel Price is used for air and express services
For parcel and LTL, the surcharge is applied as a percentage of the base charge. For example, with the current national diesel price at $3.90 per gallon (as of March 2026) and a carrier table showing a 22% surcharge at that price point, a $500 shipment would carry $110 in fuel surcharges.
For full truckload (FTL), carriers typically use a per-mile formula:
Fuel surcharge = (Current Diesel Price – Base Diesel Price) ÷ Average Truck MPG
With a $2.50 base, $3.90 current diesel, and 6 MPG on a 500-mile haul, that's $117 in fuel surcharges.
Why fuel surcharges are volatile
Fuel surcharges don't just drift gradually. They can spike with little warning when geopolitical events disrupt energy markets.
Consider the pattern: National diesel averaged $2.67/gallon in January 2021 during COVID lows, then surged to $5.81/gallon by June 2022 following Russia's invasion of Ukraine. A 118% increase in 18 months. Prices stabilized in the $3.50–$3.90 range through 2024 and 2025.
But in March 2026, the conflict in the Middle East sent oil prices past $100/barrel, with the Strait of Hormuz—a conduit for roughly 20% of global oil and gas flows—effectively closed to shipping. U.S. gas prices jumped roughly 50 cents per gallon within a single week.
For shippers, that kind of volatility translates directly into weekly surcharge fluctuations that make accurate budgeting nearly impossible, and make cost visibility tools essential rather than optional.
This pattern will repeat. Whether the trigger is a hurricane in the Gulf, a pipeline shutdown, or a geopolitical crisis, fuel surcharges amplify the impact of every energy market disruption on your transportation spend.
Why fuel surcharges deserve more attention than they get
At Loop, we’ve processed billions in spend. We’ve found that fuel surcharges represent, on average, 9.3%1 of total invoice cost, but range from 4% to over 16% depending on mode, carrier, and lane.
That wide variance means many shippers are significantly underestimating this line item.
Here's what catches teams off guard:
- Surcharges have decoupled from fuel costs.
Carriers adjust their surcharge tables independently of actual fuel price movements, meaning you can pay higher surcharges even when pump prices are flat or declining. This also means they can happen at random, unexpected times.
- They compound on other fees.
Both FedEx and UPS raised fuel surcharge tables to all-time highs heading into 2026 (FedEx Ground hit 22.25%; UPS Ground exceeded 21%), on top of their annual 5.9% GRI. Critically, fuel surcharges at both carriers now compound on a growing list of accessorials. Meaning the surcharge is calculated on a larger base than just your transportation rate, and the headline GRI dramatically understates the true cost increase.
- Contract discounts erode silently.
A 25% discount negotiated in early 2024 may now yield only a 15% effective benefit when recalculated against updated surcharge tables.
- Weekly variability creates an unrealistic operational burden.
Surcharges adjust weekly based on EIA data, and most shippers manage multiple carriers across multiple modes—each with different surcharge tables, different fuel indices, and different rules for which charges the surcharge applies to.
Manually tracking every weekly reset, cross-referencing contract terms, and auditing every invoice is simply not feasible for a transportation team that's also managing carrier relationships, negotiating contracts, and solving service failures. That operational gap is exactly where billing errors accumulate unnoticed.
Take control of fuel surcharges
You can't control fuel prices or geopolitical events. But you can control whether you have the visibility and systems to stay ahead of surcharges eroding your margin. That's where Loop’s Logistics Data Platform comes in.
- Automated fuel surcharge auditing.
Loop ensures every charge is validated against the correct carrier table, fuel index, and contract terms. We proactively catch misapplied percentages, wrong surcharge tiers, and charges on exempt services that no team has the bandwidth to catch manually across every weekly reset.
- Granular cost visibility.
Your total spend is broken down by component so you can see exactly what costs are growing and identify when surcharge table changes are outpacing your negotiated discounts.
- Proactive contract optimization.
When carriers adjust their surcharge tables or announce a GRI, Loop models the real-world impact on your specific shipping profile—including accessorial compounding, zone mix, and fuel surcharge exposure—so you can negotiate from a position of data, not guesswork.
- Fuel surcharge cap guidance.
Loop's visibility into surcharge trends across carriers and modes helps you identify where to negotiate caps in your contracts and quantify the protection they provide.
Fuel surcharges may be unavoidable, but overpaying for them isn't. The shippers who maintain visibility and rigor in their cost management are the ones who protect their margins when markets move.
Connect with our experts today to start proactively auditing your fuel surcharges.
1Loop Internal Data, March 2026.
