Fuel Surcharge Calculator
Calculate the fuel surcharge amount based on current fuel prices, baseline price, and trip distance.
Results
Visualization
How It Works
Fuel surcharge (FSC) is the contractual mechanism that splits diesel-price risk between shipper and carrier. The standard formula benchmarks the EIA U.S. On-Highway Diesel Retail Price (published every Monday afternoon at eia.gov) against a contract base — usually $1.20-$1.25/gal for legacy contracts dating back to the 2000s, or a more current $3.00-$3.50 baseline. Each cent above base divided by an MPG assumption (commonly 6.0) becomes the surcharge per mile. The OOIDA-recommended formula uses actual MPG; large shippers like Walmart and J.B. Hunt typically dictate a 6.0 MPG floor. Get the base and MPG wrong and you eat 100% of price spikes.
The Formula
Variables
- Current Fuel Price — EIA weekly U.S. average or PADD-region average per contract
- Base Fuel Price — Trigger-point baseline negotiated when contract was signed
- MPG — Contractually assumed MPG (lower is better for carrier)
Worked Example
EIA national diesel for the week of March 17, 2026 posts at $4.20/gallon. Your contract has a $3.50 base and assumes 6.0 MPG. Spread = $0.70. Surcharge/mi = $0.70 / 6.0 = $0.1167. On a 500-mile lane, total FSC = $58.33 added to the linehaul. Now suppose the shipper insists on a 7.0 MPG assumption: $0.70 / 7.0 = $0.10/mi, total FSC = $50. You've given up $8.33 per load — and that compounds 4-5 times per week. Across 200 loads/year, the difference between a 6.0 and 7.0 MPG contract on identical lanes runs roughly $1,666 of margin.
Practical Tips
- Pin the FSC to PADD-specific EIA diesel where it favors you. PADD 1B (Central Atlantic) ran $0.18/gal above the national average through 2025; PADD 4 (Rocky Mountain) trails the national by $0.10-$0.15. If your lanes are East Coast, peg to PADD 1B and capture the higher number.
- Negotiate the MPG factor before you negotiate the rate per mile. Going from 7.0 to 6.0 MPG in the formula at $1.00 over base equals $0.024/mi more — worth more than most rate-per-mile concessions on a 500-mile haul.
- Watch for hidden caps. Some shipper contracts include a max FSC per mile (e.g., "shall not exceed $0.40/mi") buried in section 9 or appendix. At $5.00/gal diesel and a $1.00 base with 6.0 MPG that's a $0.667/mi calculated surcharge — a $0.40 cap costs you $0.267/mi pure margin loss.
- EIA publishes diesel weekly Mondays at 5pm ET. The PDF is at eia.gov/petroleum/gasdiesel/. Carriers sometimes use a 4-week trailing average to smooth volatility — fine in stable markets, but in a fast rise like June 2022 the trailing average kept payouts $0.20/gal below pump, costing carriers an extra $0.033/mi at 6.0 MPG.
- On flatbed and reefer, base contract MPG should reflect your actual rig. A 2018 Peterbilt 567 hauling a tri-axle stepdeck with oversize tarps averages 5.7 MPG empty and 5.2 loaded. Don't accept the standard dry-van 6.0-6.5 number; provide a 12-week sample and negotiate to 5.5 MPG.
- Invoice the FSC as a separate line item per OOIDA guidance — keeps the linehaul rate clean for rate-confirmation databases (DAT, Truckstop) and makes audit trails clearer for IFTA and IRS purposes.
Frequently Asked Questions
What is a fuel surcharge in trucking?
A contractual add-on to the linehaul rate, indexed to a published diesel price benchmark (almost always EIA weekly). It adjusts automatically — usually weekly — so the carrier doesn't eat the volatility between $3 and $5 diesel and the shipper doesn't pay sky-high rates locked in during peak prices.
How is the base fuel price set?
Negotiated when the contract is signed. Three common patterns: (1) round number like $3.00 or $3.50, (2) the EIA weekly average on the day of signing, (3) a legacy $1.20-$1.25 base from contracts originally written in the early 2000s — shippers love these because they trigger surcharges at much lower price points but result in inflated FSC numbers that aren't really "extra."
How often does the fuel surcharge actually change?
Standard is weekly using EIA Monday data, applied to loads tendered that week. Some big shippers (Walmart Transportation, large 3PLs) use bi-weekly or monthly cycles. In a rising-price environment, weekly favors the carrier; in a falling environment, the longer cycle does. The cycle is in the contract, not the law.
Is fuel surcharge taxable income?
Yes — it's ordinary trucking revenue per IRS treatment, reported on the same Schedule C or 1120 line as linehaul. The actual diesel paid is a deductible business expense, so the FSC effectively flows through. No special tax treatment exists for FSC despite occasional misconceptions — IRS has not issued a separate revenue procedure for it.
Why does my FSC seem to undercover my actual fuel?
Three usual causes: (1) the contract MPG is higher than you actually run (7.0 vs 6.4 real-world is a $0.013/mi gap at $1.00 over base), (2) the contract base is too low for current pricing (e.g., $1.25 base with FSC capped — common with old contracts), (3) deadhead miles aren't reimbursed by FSC — only loaded miles, but you burn fuel both directions.
Can a broker pocket part of the fuel surcharge?
Legally complicated. Federal regulation 49 CFR §371.3 requires brokers to disclose all carrier compensation to shippers on request; some courts have held that FSC paid by shipper must pass through to carrier. In practice, brokers vary — small brokers usually pass it; large brokers sometimes treat it as part of the negotiated rate and don't separate it. Always ask for the rate breakdown.