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Fuel Surcharge Calculator

Work out your fuel surcharge the same way brokers and shippers do: current diesel price minus your base price, divided by your real MPG. Check what you're being paid, and what you should be charging.

100% free · no signup · nothing to install

Surcharge per mile
$0.4000
($2.60 over base ÷ 6.5 MPG)
Surcharge this load
$200.00
500 miles
All-in revenue
$1250.00
$2.50/mile including surcharge
How the standard fuel surcharge works

Almost every shipper and broker in the country uses the same formula: take the current diesel price, subtract the base (peg) price written into the contract, and divide the difference by an assumed miles-per-gallon. That's your surcharge per mile. The two numbers worth fighting over are the peg price and the MPG assumption — a contract that assumes 7 MPG when your fleet runs 5.8 quietly transfers the entire fuel increase onto you.

Surcharge per mile = (Current price − Base price) ÷ MPG
Most contracts peg between $1.20 and $1.30/gal and assume 6.0–6.5 MPG. Some update weekly against the DOE average, some monthly, the update frequency matters as much as the formula when prices are moving.
Surcharge per mile at different fuel prices
Diesel price5.5 MPG6.5 MPG7.5 MPG
$3.00$0.318$0.269$0.233
$3.50$0.409$0.346$0.300
$4.00$0.500$0.423$0.367
$4.50$0.591$0.500$0.433
$5.00$0.682$0.577$0.500
$5.50$0.773$0.654$0.567

Calculated against your base price of $1.25/gal.

Fuel costs money. So do fuel taxes.

Every gallon you buy and every mile you run feeds an IFTA return four times a year. We collect the mileage and receipts, apply the right quarterly rates including surcharge states, and file it for you.

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