How to use this guide
Read the sections in order the first time, then use the headings as a working checklist. Keep one time period, vehicle or fleet definition, and set of units throughout the calculation. Replace examples with actual documents and note the source date when a rate or rule can change.
Save or download a calculator scenario only after reviewing every field. The site performs planning arithmetic; it does not validate the records, determine legal treatment, submit a form, or bind a carrier, customer, government agency, lender, or tax authority.
Baseline-price method
A common formula subtracts a contract baseline fuel price from the current contract reference price, floors negative differences at zero, and divides by a contract MPG factor. The result is surcharge per eligible mile.
The reference price may be a national or regional index and may use a specified publication date. Enter the contract value rather than today's pump price unless the agreement says otherwise.
Flat CPM method
Some agreements pay a flat cents-per-mile surcharge. Convert cents to dollars before multiplying by eligible miles. Confirm whether loaded, dispatched, or all miles qualify and whether partial miles are rounded.
The calculator supports both methods and keeps the assumptions visible.
Verify recovery
Compare surcharge revenue with actual trip fuel cost, but do not expect them to match exactly. A surcharge may be designed to recover fuel price above a baseline, not the entire fuel bill. MPG, idling, deadhead, terrain, and purchase price create differences.
Use the fuel-cost tool and full load-profit model for the complete decision.
Verification and decision checklist
- Define the business question and time period before collecting inputs.
- Use primary records and current official sources where they apply.
- Keep paid miles, all miles, revenue, cash, deduction, tax effect, cost, and profit labels distinct.
- Run a conservative scenario when price, miles, utilization, delay, or tax treatment is uncertain.
- Compare the planning result with the controlling contract, settlement, filing instructions, or professional review.
Update the calculation when a route, quarter, rate, carrier policy, equipment decision, or source document changes. A saved estimate is a snapshot of assumptions, not a live guarantee.
Important limits
This guide is general education, not legal, tax, accounting, payroll, lending, investment, insurance, dispatch, safety, or compliance advice. Do not use it to change duty status, exceed equipment ratings, disregard a warning, or make an emergency decision. Current rules, documents, and qualified advice control.