Trip fuel cost calculator for semi trucks

How the semi truck fuel calculator works

• Road gallons = trip miles ÷ miles per gallon.
• Reefer gallons = hours the unit runs × its burn rate, if you add it.
• Trip fuel cost = total gallons × diesel price.
• Fuel stops = how many times you refuel after starting full, keeping your reserve in the tanks.

Count all the miles, including the deadhead to the pickup. The truck burns the same diesel on empty miles, and they are the ones a rate per loaded mile hides.

Worked example EXAMPLE

A reefer runs 1,300 miles from the Midwest to the Southeast at 6.5 mpg, with diesel at $4.00. The tractor burns 200 gallons, $800, about 62 cents a mile. The unit runs 24 hours at 1 gallon an hour, adding 24 gallons and $96. With 250 gallons of tank and a 50-gallon reserve, the truck can make the trip on the fuel it started with.

If the load pays $3,000, fuel takes about 30% of it. If the deadhead to the pickup was another 250 miles, add about $154 more, and the share climbs.

Fuel cost per mile for semi truck runs

Fuel per mile is the diesel price divided by mpg, and small changes in either move it more than most drivers expect. Going from 6.5 to 7 mpg at $4.00 saves about 4 cents a mile, or roughly $440 on 10,000 miles. A 20-cent change in diesel moves your cost about 3 cents a mile at 6.5 mpg. Check the price where you will actually buy fuel; the US Energy Information Administration publishes weekly regional diesel averages that show where prices are heading.

What moves your miles per gallon

• Weight. A heavy load burns more than a light one on the same road.
• Speed. Wind resistance grows quickly as speed climbs.
• Terrain and weather. Mountains, headwinds and cold all cut mpg.
• Idling. Hours parked with the engine running burn fuel without miles.
• The trailer. A flatbed with an open load, a tall car hauler or a tanker each pushes air differently from a closed van.

Fuel surcharge and your trip cost

Many loads pay a fuel surcharge on top of the linehaul, meant to move with diesel prices. Compare the surcharge with the trip fuel cost from this calculator. If the surcharge covers most of the fuel, the linehaul is left for everything else. If a broker quotes one all-in number, split it in your head: take out the fuel first, then judge whether what is left covers your other costs per mile.

Planning fuel stops

The fuel stops figure assumes you start full and refuel before you dip into your reserve. Plan the stops where diesel is cheaper or where your fuel card works, and avoid buying a full fill in a high-price state if you can reach a lower-priced one on what is in the tanks. On mountain routes and in winter, keep a bigger reserve: a closed pass can leave you idling for hours.

How much does it cost to fill a semi truck?

Tank sizes vary by tractor, so the calculator asks for yours. Multiply the total capacity by the price and you have the cost to fill from empty. In practice drivers fill well before empty, so a typical stop costs less than that figure, but your fuel card limits and cash flow should allow for a full fill on an expensive day.

Fuel for 26 ft box trucks and hotshots

The same math works for any truck we dispatch, from a 26 ft box to a heavy haul tractor. A 26 ft box truck or a hotshot pickup gets better mpg than a loaded tractor but carries smaller tanks, so it stops more often. Use your own mpg and tank size, and the trip cost and stops follow.

Fuel is one line in your cost per mile; work out the rest with the trucking cost per mile calculator, and see what a fuel card saves with the fuel card savings calculator. When you dispatch with us, we plan loads to keep empty miles and fuel down, and you approve each one. See our dispatch for owner-operators or send an application.