What Is FSC in Trucking? Fuel Surcharge Meaning and Math
FSC stands for fuel surcharge — the variable fuel line on a freight invoice, indexed to the EIA weekly diesel price. Here's how it's calculated and how to check yours.
FSC stands for fuel surcharge. It's the variable line on a freight invoice that covers the cost of diesel, charged separately from the base linehaul rate and indexed to a public weekly diesel price. When fuel goes up, the FSC goes up; the linehaul rate does not move with it.
That's the whole definition. The rest of this page is how the number is actually calculated, why it differs between trucking, LTL, and air freight, and the two checks that tell you whether the FSC on your invoice is correct.
What FSC means in trucking, shipping, and logistics
The abbreviation means the same thing everywhere in freight — fuel surcharge — but the unit it's charged in changes by mode:
- Truckload trucking. FSC is usually quoted in cents per mile, multiplied by loaded miles. A load running 800 miles at a 42¢ FSC carries $336 of fuel.
- LTL freight. LTL FSC is almost always a percentage of the linehaul charge, applied after the class-and-weight rate is calculated. LTL percentages run high — 20% to 35% is normal — because the rate base itself is smaller.
- Air freight. Air carriers publish FSC per kilogram of chargeable weight, and it typically appears next to SSC (security surcharge), which is a separate fee for screening and handling, not fuel.
- Ocean and drayage. The fuel component shows up under other names — BAF (bunker adjustment factor) on the ocean leg, FSC again on the drayage move.
Same concept, different denominator. If a quote lists "FSC" with no unit attached, ask whether it's cents per mile or a percentage before you compare it to anything.
The FSC is indexed to a public diesel number
Nearly every fuel surcharge in US trucking ties back to one source: the DOE/EIA weekly national retail diesel price. The Energy Information Administration publishes a single average price for on-highway diesel every Monday. That number is public, it's the same for everyone, and it's the benchmark your FSC should reference.
This matters because it removes the guesswork. The FSC isn't a number a broker invents. It's pegged to a government index that updates once a week, which means you can always check the math.
How fuel surcharge is calculated
Two structures cover almost everything you'll see in the field.
Per-mile cents tied to a diesel price band. The carrier or broker publishes a table: when diesel sits between $4.00 and $4.10 a gallon, the FSC is a set number of cents per mile. Move up a band and the cents-per-mile steps up with it. Multiply by loaded miles and you have the surcharge.
A simplified table looks like this:
| EIA diesel price | FSC per mile |
|---|---|
| $3.80 – $3.89 | $0.38 |
| $3.90 – $3.99 | $0.40 |
| $4.00 – $4.09 | $0.42 |
| $4.10 – $4.19 | $0.44 |
At $4.05 diesel, a 620-mile load carries 620 × $0.42 = $260.40 in fuel.
A percentage of linehaul. Here the FSC is expressed as a percentage applied to the base linehaul rate, and the percentage climbs as diesel climbs. This is simpler to state, but it ties your fuel cost to the rate rather than to the distance you're actually shipping. A $1,400 linehaul at a 24% FSC adds $336, whether the load ran 500 miles or 900.
Per-mile tables are more common in truckload because they track the real cost driver — miles burned — instead of the rate. Percentage tables dominate LTL, where per-shipment mileage isn't the billing basis to begin with.
Why the FSC moves independently of your base rate
This is the part that trips people up. Fuel can spike while base linehaul rates stay flat. The linehaul rate reflects capacity, lane balance, and demand. The FSC reflects the price of diesel. Those two things move on completely different clocks.
You can lock a great linehaul rate and still watch your all-in cost rise the next week because diesel jumped at the pump. That's not a markup, it's the surcharge tracking the EIA index exactly as designed. Understanding this keeps you from blaming the wrong line when an invoice ticks up.
How to check the FSC on your invoice
When an FSC line looks off, two checks settle it fast:
- Check the diesel index date. The surcharge should reference the EIA price for the correct week — typically the Monday on or before your ship date. The wrong week's price means the wrong surcharge.
- Check the rate band used. On a per-mile table, confirm the cents-per-mile matches the band the diesel price actually fell into. On a percentage, confirm the percentage matches the published schedule for that price level.
Get those two right and the FSC math will reconcile. Get them wrong and you're either overpaying or chasing a correction.
Why we fold the FSC into one binding all-in rate
At Lancashire Freight, we don't hand you a linehaul number and leave the fuel surcharge to surface as a surprise line later. The fuel surcharge is included in our binding all-in quoted rate. You see one number, and that number is what you pay.
No decoding a per-mile fuel table, no arguing about which week's diesel index applied, no reconciling a separate FSC line against the EIA price after the fact. The fuel cost is already priced in. You get a quote in 60 seconds and that rate is locked for 48 hours, fuel included, so what you approve is exactly what you're billed.
The FSC is real, it's mechanical, and it's something you should always be able to verify. But you shouldn't have to do the reconciliation yourself on every load.
FAQ
What does FSC stand for in freight?
FSC stands for fuel surcharge. It is the variable portion of a freight invoice that covers diesel cost, billed separately from the base linehaul rate and adjusted weekly against a public diesel price index.
What is FSC in trucking?
In truckload trucking, FSC is a per-mile fuel charge added to the linehaul rate. The cents-per-mile figure comes from a published table tied to the EIA weekly national diesel price, and it is multiplied by the loaded miles on the shipment.
How is a fuel surcharge calculated?
Two ways. Either a cents-per-mile rate from a diesel price band table multiplied by loaded miles, or a percentage of the linehaul rate that rises as diesel rises. Truckload usually uses per-mile tables; LTL usually uses percentages.
What is FSC in LTL freight?
In LTL, FSC is charged as a percentage of the linehaul portion of the invoice rather than per mile. LTL fuel surcharge percentages commonly run between 20% and 35%, and they are published by each carrier and updated weekly.
What is the difference between FSC and SSC in air freight?
FSC is the fuel surcharge, covering jet fuel cost per kilogram of chargeable weight. SSC is the security surcharge, covering mandated cargo screening and handling. They are separate line items and only FSC moves with fuel prices.
Is the fuel surcharge negotiable?
The index the FSC references is public and fixed, but the table applied to it is not. The band widths, the cents-per-mile at each band, and the percentage schedule are all set by the carrier or broker, and all three are negotiable on contract freight.
Get an all-in freight quote — fuel surcharge included, locked for 48 hours.