Fuel Surcharge Calculator for Trucking

Owner-operator's guide to fuel surcharge

When diesel jumps from $2.50 to $3.90, every mile costs you $0.23 more at 6 MPG — $196 on an 850-mile load. Without a surcharge, that comes straight out of your pay. With one, the shipper covers the fuel inflation they caused. The formula is standard across the industry (OOIDA method): current price minus baseline, divided by your MPG. This guide shows how to set it, prove it, and collect it.

Pick a baseline and freeze it

Your baseline is the fuel price already inside your base rate — often $2.50/gal diesel or $2.10 gas. Write it into every rate confirmation. Do not float the baseline with the market; float the surcharge. If you renegotiate the base rate, reset the baseline then. The calculator defaults match common contract baselines but every field is editable.

Which diesel price should a fuel surcharge use?

Use the U.S. Energy Information Administration weekly on-highway diesel average — the benchmark most surcharge tables use — not the pump price you saw. Brokers argue pump prices; the EIA number ends the argument. This site pulls live EIA averages automatically (verify at EIA ↗). Screenshot the EIA number on the load date and attach it to your email.

Always separate line, always per loaded mile

Demand the surcharge as its own line on the rate con, computed on loaded miles. At ($6.20 − $2.50) ÷ 6.0 = $0.617/mi, an 850-mile load owes $524. Copy the built-in email template, fill the brackets, and send before you roll. Then test the all-in rate in the load profit calculator — if it is still NO-GO, your base rate is the problem, not fuel.

Surcharge table: what each diesel price pays

Baseline $2.50, 6.0 MPG contract truck. Your actual MPG changes what you keep — the table shows what you collect:

If your real MPG is 5.5 while the contract pays at 6.0, you burn more extra fuel than the surcharge covers — the $0.06 rule of thumb ($0.01/mi per $0.06 rise) only holds at contract MPG. Improve MPG or renegotiate the MPG peg, and track the gap in your cost per mile fuel line monthly.

Where diesel has moved lately (2026)

EIA weekly on-highway diesel averaged $6.529/gal the week of September 21, 2026 and $6.199/gal the week of October 5, 2026 — a $0.33 drop in two weeks. At baseline $2.50 and 6.0 MPG, that moved the surcharge from $0.672/mi to $0.617/mi: $46.58 less on an 850-mile load. OOIDA's own worked example still prices $5.25 diesel from March 2022 ($0.46/mi) — $0.16/mi light of today's market. Recalculate every load; a two-week-old surcharge is already wrong.

Carrier presets and regional diesel

Contracts rarely use $2.50. Use the preset dropdown for common pegs — industry standard $1.20/6.0, Swift $1.25/6.5, J.B. Hunt $1.20/6.0, Schneider $1.15/6.0, Werner $1.22/6.0, owner-operator $1.10/6.0 — then pick your EIA region if the contract names one (Gulf Coast vs West Coast spreads run $0.50+/gal). Presets set baseline + MPG together because changing one without the other misprices the load. Always verify against your rate con; presets are starting points, not your contract.

Put it in writing before you roll

Verbal surcharge promises disappear at settlement. Email the EIA screenshot + one-line math + load total, get a revised rate con with the surcharge as its own line, then roll. Gas runners: same formula with your baseline (commonly $2.10) and MPG (~9). Re-check the EIA average every load — weekly moves of $0.05–$0.10 are normal and worth $7–$14 per 850 miles.

Per-mile versus percentage-of-linehaul schedules

The calculator uses the per-mile method: current fuel price minus the contract baseline, divided by contract MPG. It works well when a shipper or broker agrees to a fixed cents-per-mile adjustment. Some contracts instead use a percentage of linehaul for each dollar that diesel moves above a trigger. Do not combine the two methods unless the rate confirmation clearly says to. A percentage schedule changes when the linehaul changes; a per-mile schedule changes with miles. Ask which EIA region, publication date, trigger, MPG, and mileage basis the contract uses.

For example, a $0.617 per-mile surcharge on 850 loaded miles is $524.17. If the contract pays a percentage of linehaul, the same diesel price may produce a different dollar amount when the linehaul is $1,800 instead of $2,200. Neither method is automatically better. The useful test is whether it recovers the incremental fuel cost on the actual equipment and whether the formula is clear enough to audit from the rate confirmation.

What the surcharge does not cover

A surcharge normally covers fuel above the agreed baseline; it does not automatically cover deadhead, driver pay, maintenance, tires, tolls, insurance, or an inadequate base rate. If a broker calculates it on loaded miles, your base rate still needs to carry the cost of positioning to pickup. Use the cost per mile calculator to keep those costs in your break-even and the load profit calculator to test the complete load.

Also check whether the contract uses retail diesel, tax-excluded diesel, a regional EIA average, or a fuel-card index. The pump price at one truck stop is evidence for your budget, not necessarily the contract index. Keep a dated copy of the published index and the signed rate confirmation. That small record prevents a later dispute over whether the surcharge was calculated from the right week.

Quick collection checklist

Before dispatch: confirm the baseline and mileage basis. On booking: enter current diesel, MPG, and loaded miles. Before departure: send the calculation and request the surcharge as a separate line. At settlement: compare the rate confirmation, dispatched miles, and settlement statement. If the amount is wrong, keep the EIA source and formula with the invoice. Recalculate when the load changes, the route adds deadhead, or the broker changes the base rate.

By Srikanth M. · Independent, no login, formulas shown. Last reviewed October 2026. Method: OOIDA fuel-surcharge formula using EIA prices. Full methodology: sources. Full explainer: fuel surcharge explained · about.