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Fuel Surcharge Calculator

Three numbers and you have your answer. Two of them come off your own agreement — the peg and the assumed MPG. Nothing you type here leaves your phone.

EIA national, week of Sep 21, 2026. Change it if your contract names a region or a different week.

Updated weekly. The EIA posts a new on-highway diesel average every Monday, so this figure changes — check the current one and type it in.

The base price your surcharge starts from. It is in your agreement.

The economy the formula assumes — not necessarily what your truck turns.

Use only the miles your surcharge actually applies to — see the note below.

Surcharge per mile

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On this load

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Nothing here is sent anywhere. The arithmetic runs in your browser and the page has no account, no email box, and no memory of you.

If the number does not match

One load apart is worth a look. The same gap three weeks running is a pattern, and a pattern is something you can take to somebody with the paperwork in your hand. HaulProof reads your settlement line by line and flags what does not add up, so you find it on settlement day instead of in April.

Free for 30 days — no card → See it first — no account

Or read the full guide on how the surcharge is put together.

Before you trust the number

All miles, or loaded miles only?

This changes the total more than people expect. If your surcharge pays on loaded miles only, the deadhead you burned fuel on earns nothing. Put in the miles it actually applies to, not the miles you drove.

Which week, and which region?

Most agreements name the EIA weekly on-highway average, but some use a regional figure and some apply the prior week's. Running the Northeast or the West Coast against a national average reads differently than running the Gulf.

A stale peg is the quiet one

The peg is subtracted before anything else, so a base price set in a different fuel era shapes every load you have run since. Same with an assumed MPG better than your truck delivers. Both are negotiated, and both are fair to ask about.

The calculator is the free one

It stays free, with no account, for as long as you want to use it. The rest of what HaulProof does lives behind a login:

  • Settlement audit
  • ·
  • Per-load profit
  • ·
  • Expenses & receipts
  • ·
  • Detention
  • ·
  • IFTA
  • ·
  • Taxes
  • ·
  • Truck costs
  • ·
  • Reports

$19 a month, or $190 for the year. Thirty days free first, no card.

Questions

How do I calculate my fuel surcharge?

Take the reference diesel price — usually the EIA weekly on-highway average — and subtract the base price your contract calls the peg. Divide what is left by the assumed miles per gallon in your agreement. That gives you a surcharge per mile. Multiply it by the miles the surcharge applies to and you have the dollar figure for the load. The calculator on this page does that arithmetic for you.

Is this fuel surcharge calculator really free?

Yes. There is no signup, no email, and no account. It runs in your browser and nothing you type is sent anywhere or stored. Use it as often as you like.

What numbers do I need before I start?

Three, and two of them come out of your own agreement: the peg or base price, and the assumed miles per gallon. The third is the reference diesel price, which is pre-filled here with the current EIA national average. If you cannot find your peg and assumed MPG in writing, that is worth asking about before anything else.

Why is the number here different from my settlement?

Common reasons: the surcharge was paid on loaded miles only when you assumed all miles, a different week of the DOE average was used, the peg or MPG assumption changed, the load was paid at a flat all-in rate with no separate surcharge, or the line was simply left off. One load apart is worth a look. The same gap three weeks running is a pattern.

Does a lower peg mean more money?

Yes. The peg is subtracted from the diesel price, so a lower peg leaves a bigger difference and a bigger surcharge. A higher assumed MPG works the other way — it divides the difference by a larger number and shrinks what you get. Both are negotiated, and pegs set years ago in a different fuel era are common.

Keep reading

This calculator is general education for owner-operators and leased-on drivers — not legal, tax, or financial advice. It applies the common surcharge formula to numbers you supply; it does not know your contract. The pre-filled diesel figure is the U.S. Energy Information Administration's national on-highway diesel average for the week of Sep 21, 2026. That average is published weekly, every Monday, and it changes — the figure shown here is a starting point as of the week named, not a live price, a recommendation, or a benchmark. Check the current EIA average and enter the one your agreement actually names. Your surcharge terms are whatever your agreement says they are — read it, and ask about anything you can't find. Built by a driver, for drivers.