Gas Cost Calculator (Trip Fuel)
Fuel cost for any road trip from distance, MPG, and gas price. Round-trip toggle, passenger cost split, and IRS mileage comparison.
LIFESTYLEEstimate fuel cost for any road trip from distance, vehicle MPG, and current gas price. Includes round-trip toggle, passenger cost split, and a comparison to the IRS standard mileage rate ($0.67/mi in 2026) so business travelers can see the gap between actual gas cost and the IRS reimbursement.
Trip cost = (distance / MPG) × gas_price. A 500-mile trip in a 25-mpg vehicle at $3.30/gal costs $66 (one-way). EVs use 0.3-0.4 kWh/mi - at $0.16/kWh residential electricity, that is $0.05-$0.06/mi (3x cheaper than gas). Cost-per-mile for gas is gas_price ÷ MPG: $0.13/mi at $3.30 and 25 mpg. The IRS standard rate ($0.67/mi in 2026) reimburses much more than pure gas because it covers depreciation, maintenance, insurance, and tires.
Gas Cost Calculator (Trip Fuel Estimator)
Estimate fuel cost for any trip from distance, vehicle MPG, and gas price. Includes round-trip toggle, split-cost by passengers, and a per-mile cost breakdown for tax-deductible business mileage.
IRS Mileage Reimbursement Comparison
How Gas Cost Math Works
Trip cost = (distance / MPG) × gas_price. A 500-mile trip in a 25-mpg car at $3.30/gallon costs (500/25) × 3.30 = 20 gallons × $3.30 = $66 for one-way. Round trip doubles it. Cost-per-mile = gas_price / MPG: at $3.30 and 25 mpg, that is $0.132 per mile - much less than the IRS standard mileage rate of $0.67 per mile, because the IRS rate covers depreciation and maintenance, not just fuel.
EVs change the math. Most EVs use about 0.3-0.4 kWh per mile. At $0.16/kWh residential electricity, that is $0.048-0.064 per mile - roughly 3x cheaper than gas at $0.13 per mile. EV fast-charging on the road runs $0.30-0.50 per kWh, which narrows the gap. Long road trips on Superchargers are about half the cost of gas, not a third.
For tax-deductible business trips, the IRS standard mileage rate ($0.67/mi in 2026) is almost always better than the actual-expense method. The actual-expense method only beats it for very expensive vehicles (luxury cars, large trucks) with very low miles. Document each business trip with date, purpose, and odometer/route. Apps like MileIQ track automatically via GPS.
Estimate based on average MPG. Real-world fuel economy varies with terrain, driving style, weather, AC use, and traffic. City driving typically gets 10-20% lower MPG than highway.