Calculate trip distance and fuel costs
The IRS standard mileage rate for business use rose to 76 cents per mile as of July 1, 2026 (up from 72.5 cents earlier in the year). Tracking your mileage helps with tax deductions, reimbursement, and budgeting for road trips.
The IRS mileage rate isn't just about gas — it's designed to cover the full cost of owning and operating a vehicle, including depreciation, maintenance, insurance, and repairs, not just fuel.
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How it's calculated: A mileage calculator determines trip costs by dividing the distance you plan to travel by your vehicle's fuel efficiency (miles per gallon), then multiplying by the current gas price. The formula is: (Distance ÷ MPG) × Gas Price = Total Cost.
Categories Explained: There are several types of mileage calculators. Basic calculators simply divide distance by MPG. Advanced versions factor in multiple fuel prices, toll costs, and vehicle wear. Some calculators also estimate emissions and environmental impact.
Limitations: Mileage calculators assume constant fuel efficiency, which rarely matches real-world driving. City vs. highway driving, weather conditions, tire pressure, and cargo weight all affect actual MPG. Also, gas prices fluctuate constantly—your estimate may be outdated by the time you fill up.
Using Your Results: Use mileage calculations to budget road trips, compare driving vs. flying costs, track business travel deductions, and plan fuel stops on long journeys. For tax purposes, keep records of actual expenses rather than estimates.
Example: Say your trip is 150 miles, your car gets 25 MPG, and gas costs $3.50/gallon. Divide distance by MPG: 150 ÷ 25 = 6 gallons needed, then multiply by price: 6 × $3.50 = $21.00 total fuel cost.
Divide your trip distance by your vehicle's fuel efficiency (MPG) to get gallons needed, then multiply by the price per gallon: (Distance ÷ MPG) × Gas Price = Total Cost.
This calculator assumes constant fuel efficiency, but city vs. highway driving, weather, tire pressure, and cargo weight all affect real-world MPG, and gas prices change constantly.
This tool estimates fuel cost, not the IRS standard mileage deduction. For tax purposes, keep records of actual expenses or use the current IRS standard mileage rate for the relevant period.