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To calculate a mileage-based freight fuel surcharge, subtract the contract’s base fuel price from the applicable diesel-index price, divide by the contract’s MPG divisor, and multiply the result by the contract-defined miles: ((index price − base price) ÷ MPG divisor) × load miles = load surcharge.
That equation is a common pattern, not a universal rule. Your signed contract or tariff controls the index and region, base price, MPG divisor, mileage definition, rounding, update schedule, effective date, and whether the surcharge is a per-mile amount or a percentage of linehaul. Some tariffs use a bracket table instead of continuous arithmetic.
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What a freight fuel surcharge is
A fuel surcharge is a separate, adjustable part of a freight rate intended to track changes in diesel costs. It is normally shown apart from the base linehaul rate so the carrier and shipper can adjust the fuel component without renegotiating the entire transportation price.
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1Scan for outdated or missing drivers - takes under a minute2Repair Windows errors before they cause bigger problems3Fix the driver behind crashes, sound loss and screen glitchesThe surcharge is not a government-mandated amount and there is no single industry-wide percentage or cents-per-mile figure. Carrier tariffs and customer agreements can use different indexes, geographic averages, base prices, mileage rules and adjustment intervals. FedEx Freight states that its customer agreement is the final authority for the customer’s calculation and adjustment frequency (FedEx Freight fuel-surcharge information).
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For a particular shipment, identify the governing agreement before doing any arithmetic. A published carrier table may override a formula, and an LTL percentage schedule should not be converted into a truckload cents-per-mile charge unless the tariff expressly permits that conversion.
How to calculate a fuel surcharge per mile
The standard mileage-based pattern is:
Surcharge per mile = (applicable diesel index price − contract base fuel price) ÷ contract MPG divisor
Then calculate the amount for the shipment:
Load surcharge = surcharge per mile × contract-defined load miles
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Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Repair Windows errors before they cause bigger problemsFix Now →The units must match. If the two fuel prices are in dollars per gallon and the divisor is miles per gallon, the result is dollars per mile. Multiply by miles, then round according to the agreement. Some documents display the result in cents per mile rather than dollars.
What each input means
| Input | Meaning | Questions to answer in the contract |
|---|---|---|
| Applicable diesel index price | The published fuel price used for the adjustment. | Which index, tax treatment, geography and reference week apply? |
| Base fuel price or peg | The fuel price included in the negotiated linehaul rate. | Is it fixed, and does the agreement state dollars per gallon? |
| MPG divisor | The assumed fuel economy used to turn a gallon-price difference into a mileage charge. | What value is specified, and is it a divisor rather than a multiplier? |
| Load miles | The miles to which the surcharge applies. | Are miles loaded, linehaul, practical, shortest-route, deadhead or another defined basis? |
| Rounding rule | When and how the amount is rounded. | Round per mile, at the load total, to cents or to whole cents per mile? |
Step-by-step: calculate the surcharge for one load
- Find the controlling agreement. Use the signed shipper-carrier contract, tariff, tender or rate confirmation. Note whether it specifies a formula, bracket table or percentage.
- Identify the shipment’s effective period. Record the date the load is picked up or tendered, whichever the agreement uses. A weekly index may be published on one date but become effective on another.
- Retrieve the correct index price. Confirm the index’s geographic scope, taxes and unit. Do not substitute a retail price from a different region or week.
- Confirm the base price and MPG divisor. Copy both values exactly. A divisor of 5.0 MPG means divide by 5.0; it is not multiplied into the price difference.
- Subtract the base from the index. If the index is below the base, determine whether the contract permits a negative surcharge, a zero floor or another treatment.
- Divide by the MPG divisor. This produces the surcharge per mile before any specified rounding.
- Determine applicable miles. Use the mileage source and exclusions required by the agreement. The route shown in a mapping application may not be the contractual mileage.
- Multiply and round. Multiply the per-mile amount by the applicable miles and apply the contract’s rounding rule.
- Document the calculation. Save the index publication date, effective dates, inputs, mileage source, intermediate result and final invoice amount.
Worked example using the mileage formula
Assume a contract specifies an index price of $4.00 per gallon, a $1.00-per-gallon base price, a 5.0 MPG divisor and 500 applicable miles. These numbers illustrate the arithmetic only; they are not a market quote or a universal contract standard.
- Price difference: $4.00 − $1.00 = $3.00 per gallon.
- Per-mile surcharge: $3.00 ÷ 5.0 = $0.60 per mile.
- Load surcharge: $0.60 × 500 = $300.
If the contract requires rounding to the nearest cent per mile, the $0.60 figure is already at the required precision. If it instead requires rounding only after multiplying, retain the full unrounded value until that final step.
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The historical DOT/Volpe estimator and its limits
A July 2009 draft from the U.S. Department of Transportation Volpe Center and U.S. Department of Defense/USTRANSCOM presents the same basic structure: DOE self-service diesel price including taxes (A), a $1.15-per-gallon base (B), and 5.0 MPG (C). Its expression is “(A minus B) divided by C = Fuel Surcharge in cents per loaded mile, rounded to the nearest whole cent.” The draft says the calculation is reviewed weekly and applies to shipments loaded on or after an adjustment date until the next adjustment.
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Those assumptions belong to that estimator. The $1.15 base, 5.0 MPG divisor, tax treatment and weekly procedure should not be copied into a current agreement unless your contract actually adopts them.
Three structures used in real freight schedules
| Structure | How the amount is produced | Where it is commonly seen | What to verify |
|---|---|---|---|
| Continuous per-mile formula | Subtract the base price, divide by MPG, then apply miles. | Truckload and other agreements that state a formula. | Index, base, MPG, mileage, rounding and negative-surcharge treatment. |
| Bracketed cents-per-mile table | Locate the index-price range and take the listed cents-per-mile amount. | Tariffs that publish weekly DOE-indexed tables. | Price-band boundaries, effective week and whether the amount changes at each band. |
| Percentage of linehaul | Multiply the specified percentage by linehaul and any other charges named in the tariff. | LTL schedules and some truckload programs. | Charge base, included fuel-consuming services, thresholds and effective date. |
A Linkex truckload tariff example uses the first Monday’s DOE U.S. average retail diesel index and maps price ranges to cents-per-mile amounts. A transportation agreement filed with the SEC similarly uses $0.05 price bands, $0.01-per-mile changes and requires the surcharge to appear as a separate invoice line. These are examples of schedule design, not mandates for every carrier.
FedEx Freight publishes LTL and truckload percentage schedules and says its surcharge applies to linehaul and other fuel-consuming services identified in its rules tariff. TForce Freight tariff language also uses percentage changes for LTL when the index crosses named thresholds. Use the applicable percentage schedule as written rather than forcing it into the mileage equation.
Current dated examples—and why they change
Official schedules illustrate why the effective date matters. The U.S. Department of Energy ATLAS schedule listed an October 5, 2026 diesel price of $6.199 per gallon and a truckload surcharge of $0.79 per mile effective October 7–13, 2026. The same schedule listed 40% for LTL and 40% for household goods, with modal effective dates that differ. These values apply to the specified DOE rate tenders, not to every freight load or carrier.
For October 7–13, 2026, FedEx Freight listed 57.70% for LTL and truckload based on the weekly price reported for October 5. Its page describes weekly adjustment, while also stating that the customer agreement controls the calculation and adjustment frequency. A carrier’s published percentage therefore cannot be assumed to govern a shipment booked under another agreement.
Fuel indexes and schedules are volatile. Recheck the current index, table or percentage and its effective date whenever you price a load or update an article, spreadsheet or tariff reference. The dated examples above were current on October 9, 2026, and can change in a later week.
How to determine the correct miles
“Miles” is often the most disputed input. Contracts may define loaded miles, linehaul miles, practical miles, shortest legal route, mileage-system miles or a fixed lane distance. They may exclude origin or destination accessorials, repositioning, empty miles or stop-off miles—or include them explicitly.
- Read the mileage definition before opening a map.
- Use the mileage system named in the agreement when one is specified.
- Keep the route or mileage report attached to the rating record.
- Apply minimum-mileage, maximum-mileage and multi-stop provisions exactly as written.
- Do not add deadhead or detention miles unless the tariff makes them surchargeable.
For a 500-mile load, a $0.60-per-mile surcharge is $300. If the contract instead caps surchargeable mileage at 450 miles, the same per-mile rate produces $270. The arithmetic is simple; the contractual mileage basis determines which arithmetic is valid.
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Three dates can appear in a schedule:
- Index reference date: the day or week whose diesel price is measured.
- Publication date: when the index or schedule is posted.
- Effective date: when the new surcharge applies to shipments.
They need not be the same. A schedule can use a Monday index, publish the table later in the week and apply it to loads picked up during a following Wednesday-to-Tuesday period. Match the shipment date to the agreement’s effective-date rule, not simply to the day you happened to download the table.
Percentage schedules: calculate only the stated charge base
For a percentage schedule, the general operation is:
Fuel surcharge = applicable percentage × charge base
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The charge base might be linehaul alone or linehaul plus specified fuel-consuming services. For example, if a tariff says 20% of $1,500 linehaul, the surcharge is $300. That result does not establish that accessorials, stop charges or other services are included. Add them only when the tariff says they belong in the percentage base.
Do not compare a 57.70% LTL schedule directly with a $0.79-per-mile truckload schedule as if they were equivalent rates. One is a percentage of a charge base; the other is a mileage amount tied to a tender schedule.
Building a reliable spreadsheet
A spreadsheet is sufficient for repeated calculations; a specialized calculator is not required. Keep contract settings separate from shipment inputs so a weekly update does not overwrite historical loads.
| Column | Example entry |
|---|---|
| Agreement or tariff | Contract identifier and version |
| Index reference date | 2026-10-05 |
| Effective shipment period | 2026-10-07 to 2026-10-13 |
| Index price | 4.0000 |
| Base price | 1.0000 |
| MPG divisor | 5.0000 |
| Applicable miles | 500 |
| Unrounded per-mile result | (index − base) ÷ MPG |
| Rounded per-mile result | Per contract rule |
| Load surcharge | Rounded rate × applicable miles, or contract-specified alternative |
Protect the index and contract cells from accidental edits, retain prior weeks’ values, and include a note when the schedule changes from formula to bracket or percentage. For a bracket table, use a lookup that handles inclusive and exclusive band boundaries exactly as published.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Invoice checking and dispute workflow
- Obtain the rate confirmation, tariff or customer agreement governing the shipment.
- Check the shipment’s pickup or tender date against the schedule’s effective period.
- Verify the index value, geography, taxes and reference date.
- Recalculate the surcharge using the specified formula or locate the correct bracket.
- Confirm miles or the percentage charge base, including any caps, floors or exclusions.
- Check rounding and the separate-line requirement.
- Compare the recalculated amount with the invoice and record the difference.
- Send the carrier the calculation worksheet and the exact contract clause when requesting correction.
A separate invoice line improves auditability, but the line label alone does not prove that the amount is correct. The underlying tariff and effective-date rule control.
Common mistakes and fixes
Using a “standard” base price
Mistake: inserting a commonly quoted base such as $1.15 without checking the agreement. Fix: use the contract’s stated peg; if none is stated, obtain written clarification before rating the load.
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Using the wrong index geography or tax basis
Mistake: substituting a local pump price or an index excluding taxes for a tax-inclusive national average. Fix: match the named index, region and tax treatment.
Applying a truckload equation to an LTL percentage
Mistake: dividing a percentage by MPG or multiplying it by miles. Fix: apply the LTL tariff’s percentage to the charge base it names.
Ignoring effective dates
Mistake: using the table posted today for a shipment picked up during an earlier period. Fix: use the schedule effective for the shipment date under the agreement.
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Rounding too early
Mistake: rounding the index, per-mile result and total when the contract calls for only one rounding step. Fix: retain precision until the contract’s stated rounding point.
Charging the wrong miles
Mistake: using a preferred map route when the tariff requires a named mileage system or loaded miles. Fix: document and apply the contractual mileage definition.
Assuming the surcharge can go negative
Mistake: issuing a credit whenever the index falls below the base. Fix: check for a zero floor, credit mechanism or other provision; do not infer one.
What to confirm before signing or using a schedule
- Named diesel index, geography and tax inclusion.
- Base fuel price or threshold.
- MPG divisor, if a formula is used.
- Formula, bracket bands or percentage method.
- Mileage source and treatment of deadhead, stops and minimums.
- Charge base for percentage schedules.
- Rounding precision and timing.
- Publication, adjustment and shipment effective dates.
- Floors, caps and treatment when the index is below the base.
- Whether the surcharge applies to linehaul only or to listed accessorial and fuel-consuming services.
- Required invoice line-item description and supporting documentation.
Bottom line for pricing a freight load
Start with the governing contract, not a presumed industry formula. If it uses the common mileage method, calculate (index − base) ÷ MPG, multiply by the contract’s miles and apply its rounding rule. If it uses a bracket table or percentage, follow that schedule instead. Verify the index reference date, effective shipment period, mileage or charge base and any floors or caps before approving the invoice.
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