The Standard Fuel Surcharge Formula
This formula is used by the majority of trucking companies, freight brokers, and owner-operators in the United States. It calculates a per-mile surcharge that adjusts with fluctuating diesel prices, providing fair compensation for fuel costs.
This formula directly ties the surcharge to actual fuel cost increases. When diesel prices rise above the baseline, the surcharge compensates for the additional fuel expense per mile traveled.
Understanding Each Variable
Current Diesel Price
The current national or regional retail price of on-highway diesel fuel. Most contracts reference the DOE/EIA Weekly Retail On-Highway Diesel Price, published every Tuesday by the U.S. Energy Information Administration.
Baseline Price
The reference diesel price set in your carrier contract. This is the price at whichno surcharge applies. Common baselines range from $1.10 to $1.50 per gallon.
Miles Per Gallon (MPG)
The average fuel efficiency of the truck. Most contracts use 6 MPG as the standard for loaded tractor-trailers. This accounts for varying terrain, weather, and load weights.
Step-by-Step Calculation
Get the Current Diesel Price
Check the DOE/EIA weekly diesel price. Most carriers update their surcharges on Tuesday or Wednesday after the new price is published.
Identify Your Baseline Price
Find the baseline in your carrier contract or rate agreement. If not specified, use the industry standard of $1.20.
Calculate Price Above Baseline
Subtract the baseline from the current price. This is the excess fuel cost.
Divide by MPG
Divide the excess by fuel efficiency to get the per-mile surcharge.
Multiply by Trip Miles
Multiply the per-mile surcharge by total trip distance.
Real-World Examples
Example 1: Standard Contract
- Current Diesel: $3.85/gal
- Baseline: $1.20/gal
- MPG: 6
- Trip Distance: 750 miles
Example 2: Owner-Operator with Lower Baseline
- Current Diesel: $3.60/gal
- Baseline: $1.10/gal
- MPG: 5.5 (heavy haul)
- Trip Distance: 1,200 miles
Formula Variations by Carrier
While the per-mile formula is most common, some carriers use alternative methods:
| Carrier | Baseline | MPG | Notes |
|---|---|---|---|
| Swift Transportation | $1.25 | 6.5 | Higher efficiency assumed |
| J.B. Hunt | $1.20 | 6.0 | Industry standard |
| Schneider National | $1.15 | 6.0 | Lower baseline |
| Werner Enterprises | $1.22 | 6.0 | Slightly higher baseline |
Carrier formulas can vary by contract, lane, and customer. Always verify the specific terms in your rate agreement.
Common Mistakes to Avoid
FSC calculations should use the official EIA/DOE weekly average, not local pump prices.
DOE prices change every Tuesday. Using outdated prices costs you money.
If current price is below baseline, the surcharge is $0—not negative.
Some contracts use percentage-based FSC. Don't mix up the formulas.
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