Fuel Surcharge Calculator

There is no official fuel surcharge

The diesel price is public. The surcharge isn't. The U.S. Energy Information Administration publishes the price every week, and its own FAQ says the agency "does not calculate, assess, or regulate diesel fuel surcharges." Shippers and carriers negotiate them privately, each with its own method. Many share the input, the EIA's weekly price, and run it through two numbers the contract sets: a base price and an MPG.

Those two numbers move the answer further than diesel's slide from September 21 to October 5, 2026 did. One week's price, one truck at 6.5 MPG, three base prices a contract might name:

Same lane, same week, same diesel, and the surcharges sit $199.77 apart on one trip with nobody's math wrong. These bases are example inputs; no one publishes a standard. Compare the base and MPG behind a surcharge before you compare the surcharge itself.

What is a fuel surcharge, then?

The fuel surcharge meaning in trucking is a charge billed on top of the linehaul rate that moves with the price of diesel, so the linehaul can stay put while fuel swings. Truckload contracts commonly state it in cents per mile; some carriers publish a percentage of linehaul instead. The base price, sometimes called the peg, is the diesel price at which the surcharge is zero.

How to calculate a fuel surcharge

Take the U.S. average for the week of October 5, 2026, $6.199, and the example base of $1.25. The gap is $4.949 a gallon. At 6.5 miles to the gallon the truck burns 1 ÷ 6.5 of a gallon each mile, so it is short $4.949 ÷ 6.5 = $0.7614 a mile. That's 76.1¢, the figure the fuel surcharge calculator shows under Surcharge per mile.

Type 742 into Trip miles and Trip surcharge reads $564.95. Add a linehaul of $2.40 a mile and two more tiles fill in: % of linehaul at 31.7%, and All-in rate per mile at $3.161. To figure the fuel surcharge on paper, those are the only extra steps: surcharge × miles, and surcharge ÷ linehaul rate.

OOIDA, the owner-operators' association, offers a mental check: at 6 MPG, every 6¢ diesel sits above the base is worth about 1¢ a mile. At 6.5 MPG it's 6.5¢ to 1¢, so a 10¢ jump at the pump adds roughly 1.5¢ a mile.

Which diesel price, and when it changes

Use the price your contract names. Many name the national average from the EIA's U.S. On-Highway Diesel Fuel Prices series, and a contract that bills a DOE fuel surcharge, or "the DOE price", means the same figure: the EIA is part of the U.S. Department of Energy.

The EIA records the self-serve pump price, taxes included, at 8:00 a.m. local time on Monday and publishes it around 10:00 a.m. Eastern on Tuesday. A government holiday pushes the release to Wednesday, still carrying Monday's price. Columbus Day 2026 does exactly that: Monday, October 12 is a federal holiday, so that week's figure comes out on Wednesday, October 14.

Three releases in a row, at the example base and MPG:

That's $37.67 less on one trip in two weeks. Whether a load takes the price for the week it picked up, delivered or was invoiced is a contract term. Write it down before the price moves.

Regional prices

The EIA also averages by region: the East Coast (PADD 1, with New England, Central Atlantic and Lower Atlantic sub-regions), the Midwest, the Gulf Coast, the Rocky Mountain region, the West Coast and California. A contract can name one of these instead of the national figure. For the week of October 5, 2026:

Gulf Coast to California is $258.33 on one trip. Every series is on EIA's weekly diesel prices page. The calculator leaves the price field for you to fill on purpose, since a number built into the page would be stale by the next Monday.

Choosing a base price and MPG

There's no standard base price. Contracts set it, and neither $1.25 nor any other figure is an industry default.

Setting your own? A lower base moves more of the fuel bill into the surcharge and out of the linehaul. What the load has to earn in total doesn't change, only how much of it floats with the pump. The trucking cost per mile calculator works out that total, fuel included.

MPG pushes the other way. The same $6.199 week at 6.0 MPG instead of 6.5 is 82.5¢ a mile, $612.03 on the 742-mile trip: $47.08 more for half a mile per gallon. A contract MPG below what the truck really gets inflates every surcharge, and one above it shrinks them.

When diesel falls below the base

The subtraction goes negative. By default the calculator holds the surcharge at zero and says so: at a $1.25 base and $1.10 diesel it shows $0.000 a mile. Some contracts pay both ways. Tick "Allow a negative surcharge when diesel is below the base price" and the same inputs give −2.3¢ a mile, a credit instead of a charge.

Fuel surcharge per mile or as a percentage

Some carriers publish a fuel surcharge percentage instead of cents per mile. Estes Express Lines, an LTL carrier, is one. It sets the percentage from the DOE national average on-highway diesel price, updates the index on Tuesdays with the change taking effect the following Wednesday, and keeps separate LTL and truckload percentages.

That percentage can't be rebuilt from a base and an MPG; it comes off the carrier's table. So the fuel surcharge calculator's Percentage of linehaul method simply applies it. A Linehaul amount of $1,850 at an illustrative 28.5% gives a $527.25 surcharge and $2,377.25 under Linehaul plus surcharge.

Per-mile mode converts the other way. Its % of linehaul tile showed 76.1¢ on a $2.40 linehaul as 31.7%; on a $3.00 linehaul the same 76.1¢ is 25.4%. Percentages from different lanes don't compare.

A fuel surcharge chart for your rate sheet

A contract that runs all year needs the surcharge at every price. The Surcharge table under the calculator builds one at your base and MPG: set From and To in dollars a gallon and a Step from 1¢ to 25¢. It opens at $3.00 to $8.00 in 10¢ steps, stops at 200 rows, adds a % of linehaul column when a linehaul rate is entered, and highlights the row the current price falls in. Part of it at a $1.25 base and 6.5 MPG:

At $6.199 the $6.100 row lights up, because the price sits in the step from $6.10 to $6.20. Each 10¢ row adds about 1.54¢. Download CSV writes the whole schedule into a spreadsheet and Print gives a paper copy. Fuel surcharge tables like this one spare everyone the arithmetic each Tuesday.

Owner-operators, leases and the paperwork

No law requires a fuel surcharge. OOIDA puts it plainly: "Currently there's no rule, law, or regulation mandating a fuel surcharge," and adding one needs no DOT filing or government approval. Owner-operators hauling under their own authority get whatever they negotiate.

For an owner-operator leased on to a motor carrier, the lease decides. 49 CFR 376.12(e) says it "shall clearly specify the responsibility of each party with respect to the cost of fuel," along with fuel taxes, empty mileage, permits and tolls. It doesn't set a pass-through percentage. If your lease passes a diesel fuel surcharge through, get the base, MPG and price series in writing and check each settlement against them here.

On paper, the surcharge goes where both sides can check it: its own line on the rate confirmation, or a rate marked all-in, and straight after the linehaul on a trucking invoice, written as miles × the rate per mile. Copy results gives a plain-text version for an invoice note, and Share link opens the same calculation for the broker.

A surcharge isn't fuel tax. The EIA's pump price already includes taxes, and settling fuel tax between states is a quarterly job for the IFTA calculator.

Fuel surcharge questions