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Fuel Surcharge Calculator

Enter the current DOE diesel price, your fuel-surcharge base, the per-cent increment, and the load distance. Get the per-mile FSC, total fuel surcharge, and a clean line item ready to drop on the customer invoice. Plus: the full guide on how FSC actually works in the US.

How fuel surcharges actually work

The fuel surcharge (FSC) is a variable per-mile or per-load charge that floats with diesel prices. The point: diesel can swing 30–50% in a year. If a carrier locked a $3.00/mi rate when diesel was $3.00/gal and diesel ran to $4.50/gal, the carrier just lost a chunk of margin to no fault of their own. The FSC moves the diesel-price risk off the carrier and onto whoever pays the rate.

The formula every fleet uses some variation of:

• If current diesel price ≤ base: FSC = $0/mile.
• If current diesel price > base: FSC = (current price − base) × per-cent increment.
• Total FSC on the load: per-mile FSC × load miles.

The "per-cent increment" comes from the assumed truck fuel economy. A standard tractor gets ~6.5 MPG. So if diesel goes up 6¢/gal, the truck's fuel cost per mile goes up about 0.92¢/mile. Most fleets round up to $0.012/mile per ¢ over base ($1.20 per $1.00 increase), which is the same as the more familiar "6¢ per mile for every 5¢ diesel goes up" formula.

The standard FSC table

Reference table — what most US dry-van and reefer carriers use:

This is the $3.00 base, $0.012/¢ table — the most common in the market. Heavy haul, reefer, and hazmat carriers often use $0.015–$0.020/¢ (higher fuel burn).

Setting your FSC base

The base is the diesel price at which FSC = $0. Setting it correctly matters because:

• If base is too high (say $4.00 when current diesel is $4.25), the FSC is small and you eat fuel cost.
• If base is too low (say $2.00 when current diesel is $4.25), the FSC looks like sticker-shock to the customer and they negotiate hard.
• If base is unstated (you charge a flat FSC), you can't justify the math when fuel prices swing.

Industry standard is $3.00 base for asset carriers, $3.50 base for brokers passing through, $4.00 base in low-fuel-price environments. Re-set the base every 1–2 years if diesel structurally moves.

The DOE diesel index — your authoritative reference

The US Energy Information Administration publishes the Weekly Retail On-Highway Diesel Prices every Monday. This is the canonical US diesel reference price; every shipper, broker, and big carrier uses it as the FSC input.

• Source: eia.gov/petroleum/gasdiesel/
• Release schedule: Monday at 5 PM Eastern (for the week ending the prior Monday).
• Regional vs national: EIA publishes a national average plus 9 regional averages (Northeast, Lower Atlantic, Midwest, etc.). Most FSC contracts use the national average; long-haul carriers in expensive-fuel regions (West Coast, Northeast) sometimes negotiate the regional rate to avoid eating geographic fuel cost.
• Look-back window: the contract typically specifies a 1-week lookback (most common) or 2-week. So invoices generated this week use last week's DOE number.

How FSC shows up on the invoice

The line item should always reference the formula so the customer's AP can verify it:

• Per-mile invoicing: "Fuel surcharge — 850 mi × $0.300/mi = $255.00 (FSC base $3.00, DOE diesel $4.00/gal week ending 2026-06-02)"
• Flat invoicing: "Fuel surcharge — 12% of linehaul = $360.00 (FSC base $3.00, DOE diesel $4.00/gal)". Some shippers use a flat percent instead of per-mile; the percent floats with the same DOE input.

Cite the FSC base, the formula, and the diesel reference price. Without those three numbers on the invoice, every FSC line is negotiable.

What can go wrong

• Outdated DOE. If you invoice with last month's diesel reference price during a price spike, you're undercharging. Pull the current DOE number every time you generate an invoice.
• FSC on dedicated lanes. Some dedicated contracts cap FSC ("FSC table A but maxed at $0.45/mi"). Read the contract.
• FSC on backhauls. Many shippers refuse to pay FSC on backhaul moves (carrier was empty anyway). Negotiate this explicitly.
• FSC on deadhead. Most contracts exclude deadhead miles from FSC. Bill only loaded miles.
• FSC at hub-to-hub vs direct. A 1,200-mile direct move vs 1,400 through a regional hub — bill the actual practical miles, not the optimistic mileage.

Related resources

• Detention charge calculator
• Compare FreightCoreTMS to alternatives
• Bridge Formula B calculator (heavy haul)

Last updated: 2026-06-05. FSC reference rates reviewed quarterly against current US market practice. Spot something stale? Email [email protected].