Fuel Surcharge Calculator for Trucking
This fuel surcharge calculator subtracts the schedule's base price from this week's diesel price and divides by the schedule's mpg, giving the surcharge per mile and for the whole load.
Figures and rules checked October 29, 2026
Use it to check the fuel line on a contract lane's rate confirmation, to compare two fuel schedules before you sign, or to estimate how much of a spot rate is really fuel. It takes three numbers from the schedule and one from the load.
Diesel moves every week, so the surcharge does too. If you know the three numbers behind a schedule, you can check any rate confirmation in under a minute.
Fuel surcharge calculator
Get the base price and mpg from the shipper's or broker's fuel schedule. The example uses made-up figures.
How to use the fuel surcharge calculator
- Find the diesel price the schedule uses. Most schedules follow the U.S. Energy Information Administration's weekly on-highway diesel price, released on Mondays. Check whether yours uses the national average or a region, and which week (the week of pickup or the week before).
- Find the base price. It's the diesel price the linehaul already covers. It's written in the fuel schedule or the contract, not on the load board.
- Find the mpg. Also in the schedule. It's an agreed figure, not your truck's real fuel economy.
- Enter the load miles. Use the miles the schedule pays on. Most pay on loaded miles only.
If you only have a spot load with one all-in rate, ask the broker how it splits. If they won't say, run the calculator with a common schedule to estimate the fuel share, and label it as your estimate.
The formula
Surcharge per mile = (diesel price − base price) ÷ schedule mpg
Surcharge for the load = surcharge per mile × load miles
When the diesel price is at or below the base, the surcharge is zero. The calculator never shows a negative number. The EIA publishes the series behind most schedules as a weekly table of retail diesel prices, national and by region, so you can check any past week too.
Some shippers use a lookup table instead, with one surcharge for each price band, such as 2 cents more for every 5 cents diesel rises. The result is close to the formula, but always use the table in your contract when one exists. Our guide to how fuel surcharge is calculated explains the background, including how schedules handle falling prices.
Worked examples
All of these are made-up numbers to show the math. Your schedule sets the real ones.
| Situation | Inputs | Per mile | Load total |
|---|---|---|---|
| Calculator example | $5.85 diesel, $1.20 base, 6.5 mpg, 1,240 miles | $0.72 | $887 |
| Same lane, higher base | $5.85 diesel, $2.50 base, 6.5 mpg, 1,240 miles | $0.52 | $639 |
| Same lane, lower mpg | $5.85 diesel, $1.20 base, 5.5 mpg, 1,240 miles | $0.85 | $1,048 |
| Diesel up 40 cents | $6.25 diesel, $1.20 base, 6.5 mpg, 1,240 miles | $0.78 | $963 |
The base price and mpg matter as much as the diesel price. On the same lane, a schedule with a $2.50 base pays about $248 less per load than one with a $1.20 base. A schedule written at 5.5 mpg pays about $161 more than one at 6.5 mpg. That's why two contract offers with the same linehaul can be far apart.
The last row shows how fast it moves. Forty cents more per gallon adds about 6 cents a mile, or $76 on this load, without anyone renegotiating.
How to read your result
| What you see | What to do |
|---|---|
| Rate con surcharge matches the calculator | Nothing. The schedule is being applied correctly |
| Rate con shows less than the calculator | Check which week's price they used and whether the miles match, then ask the broker before you sign |
| Your real fuel cost per mile is above the surcharge plus the base | The linehaul has to cover the gap. Make sure your rate floor includes your real fuel cost |
| The surcharge is a big share of an all-in spot rate | Compare loads all-in to all-in, and check what your dispatcher's or factor's fee is charged on |
Your actual fuel cost per mile is your price paid divided by your real mpg. If you get 7 mpg and the schedule assumes 6.5, the difference stays with you. If you get 6, you're short. The cost per mile calculator shows how fuel fits with the rest of your costs.
Contract lanes vs spot loads
On a contract lane, the fuel schedule is part of the deal, and the surcharge should change every time the index moves. Check it each week for the first month, then spot-check it. Mistakes usually come from the wrong week's price or the wrong miles, not from bad faith.
On the spot market, the rate is locked when you book. Nobody adjusts it if diesel jumps before you fuel up. That's why a spot rate that worked three weeks ago may not work today, and why it pays to look at the weekly price trend before you quote a number back to a broker.
Common mistakes
- Using your pump price. The schedule uses the EIA average it names. Your truck stop price can be higher or lower.
- Using your own mpg. The formula uses the schedule's mpg. Use your own only when working out your real fuel cost.
- Mixing up regions. A schedule tied to the national average pays less on West Coast runs, where diesel usually costs more.
- Counting fuel twice. If a spot rate is all-in, don't add a surcharge on top when you compare it.
- Forgetting the timing. Some schedules use last week's price. In a fast-rising market, that lag costs you.
Fuel surcharge, fees and your bottom line
Fuel surcharge also changes what you pay others. Some dispatchers and factors charge on linehaul only, others on the full amount. Ours is charged on weekly gross, which includes fuel surcharge, and that's written in our pricing terms. To see how the base changes a fee in dollars, run your week through the dispatch fee calculator.
When you compare two spot loads, put the all-in rates into the rate per mile calculator so the deadhead counts too. And if a broker's fuel line looks wrong, our guide to reading a rate confirmation line by line shows what to ask for before you sign. The glossary entry on fuel surcharge has a short definition you can share with a new driver.
Monthly national rates, all-in and linehaul, are on our truck rates page, which shows how big the fuel share has been lately.
Fuel surcharge calculator questions
Where do I find the base price and mpg for a fuel surcharge?▾
In the shipper's or broker's fuel schedule, usually attached to the contract or rate agreement. They aren't on load boards. Ask for the schedule if it isn't on the rate confirmation.
Which diesel price should I use?▾
The one your schedule names, usually the EIA weekly on-highway diesel average, national or by region. Check which week it uses too.
Why is the fuel surcharge zero?▾
The diesel price you entered is at or below the schedule's base price, so the linehaul already covers fuel and no surcharge is owed.
Should I use my truck's real mpg in a fuel surcharge calculator?▾
No, use the mpg written in the schedule. Your real mpg only matters when working out your actual fuel cost per mile.
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