Fuel Cost Calculator for Truckers — Free 2026 Trip Estimator
Use this free fuel cost calculator to find out exactly what you’ll spend on diesel for any load. Enter your truck’s MPG, the current diesel price, and your trip distance to instantly see your fuel cost per mile, gallons needed, and total fuel cost for the trip.
How to Use This Calculator
Select your region to auto-fill the current live diesel price, or enter a price manually. Enter your truck's MPG, your loaded miles, and any deadhead miles to the pickup. The calculator instantly shows your total fuel cost, cost per mile, and gallons needed. Enter your load rate to see fuel as a percentage of revenue. Enter loads per week to see your annual fuel projection. Use the Fuel Stop Decision Tool at the bottom to decide whether to fuel now or wait for a cheaper stop ahead.
Why Fuel Cost Is Your Most Important Variable Expense
Fuel is the single largest variable cost for owner operators — typically accounting for 25 to 35 percent of total operating expenses. A 500 mile load that looks profitable at first glance can quickly turn marginal once you factor in what you will actually spend at the pump.
Knowing your exact fuel cost before you accept a load gives you a real number to evaluate against the rate being offered. If a broker offers $2.20 per mile on a 600 mile run and your fuel cost alone is $0.85 per mile, you know exactly how much margin you have left to cover your other expenses and generate profit.
What Affects Your Fuel Cost Per Mile
MPG is the biggest factor. A truck getting 7.5 MPG at $3.80 per gallon has a fuel cost of $0.51 per mile. A truck getting 6.0 MPG at the same price has a fuel cost of $0.63 per mile. That $0.12 difference across 100,000 miles per year is $12,000 in additional fuel costs annually.
Factors that affect your MPG include truck speed, load weight, terrain, engine condition, tire inflation, and aerodynamics. Maintaining consistent highway speeds between 60 and 65 mph produces significantly better fuel efficiency than running at 70 mph or above.
Average Diesel Prices and Fuel Costs in 2026
National average diesel prices in 2026 have ranged between $3.50 and $4.20 per gallon depending on the region and time of year. The West Coast and California consistently run higher than the national average. The Gulf Coast and Southeast typically run lower — Texas and Louisiana are usually among the cheapest states for diesel.
At a national average of $3.80 per gallon a truck getting 6.5 MPG has a fuel cost of approximately $0.58 per mile. At 100,000 miles per year that is $58,000 in fuel costs alone — your single largest annual expense. This calculator pulls live weekly prices from the EIA so the regional numbers are always current.
Tips to Reduce Your Fuel Cost Per Mile
Maintain steady speeds and avoid hard acceleration. Use the live regional prices in this calculator to plan where you fuel up — buying in a lower-cost region versus a higher-cost one can save $0.30 to $0.80 per gallon, which adds up fast over a full tank. Keep tires properly inflated and maintain your engine air filter for optimal combustion efficiency. Use the Fuel Stop Decision Tool above before every stop to confirm you are fueling at the right price.
Before You Hit the Road
- Cost Per Mile Calculator — Find out exactly what it costs to run your truck per mile so every load you book is actually profitable.
- Load Profitability Calculator — See the real net profit on any load after deadhead, fuel, and costs before you say yes to a broker.
- Owner-Operator Readiness Calculator — Not sure if going independent is the right move? Get scored on your finances, experience, and business preparation.
Disclaimer: The calculations provided by this tool are estimates based on the inputs you provide and may not reflect your actual fuel costs. Live diesel prices are sourced from the U.S. Energy Information Administration and updated weekly — actual pump prices vary by location and truck stop. TruckerCalc is not a financial advisor and nothing on this site should be taken as financial or professional advice. Always verify figures with your own records before making business decisions.