Cost Per Mile Calculator
Find out exactly what every mile you drive actually costs. Enter your annual mileage, fuel figures, and ownership expenses to get a true cost-per-mile figure that covers fuel, insurance, depreciation, maintenance, tires, registration, and loan interest. The result updates live, with a full cost breakdown and a comparison against the 2026 IRS standard mileage rates for business, medical, and charitable travel.
Formula
Worked example
A driver covering 15,000 miles per year in a car averaging 30 MPG at $3.50/gallon spends $1,750 on fuel. Add $1,400 insurance, $2,500 depreciation, $200 registration, $600 interest, $800 maintenance, and $200 tires = $7,450 total. Divide by 15,000 miles: $0.497/mile - below the 2026 IRS business rate of $0.725/mile.
What does "cost per mile" really include?
Most people think of fuel when they picture the cost of driving, but fuel is often the smallest part. The full picture has two layers. Variable costs rise in direct proportion to miles driven: fuel and tires are the main ones, with maintenance close behind. Fixed costs are paid whether the car moves or sits in the driveway: insurance premiums, annual registration fees, loan interest, and depreciation. Depreciation is typically the largest single line item - the average new car loses about 15% of its value in the first year and roughly 60% over five years. Because fixed costs are spread over every mile you drive, the more you drive the lower your cost per mile, which is why fleet operators and rideshare drivers who cover high mileage often report surprisingly low per-mile figures.
How to calculate your true cost per mile
Add up every dollar you spend on your car in a year: fuel (gallons used times price per gallon), insurance premiums, annual depreciation (roughly 10-15% of the vehicle's current market value, or the difference between its value at the start and end of the year), registration and license fees, loan interest paid, routine maintenance (oil changes, filters, brakes), and tires (set cost divided by expected years of life). Divide the total by the miles you drove that year. The result is your cost per mile. For fuel, the shortcut formula is gas price divided by MPG. For the other categories, divide the annual spend by annual miles. Sum all the per-mile figures to get the total.
How your cost per mile compares to the IRS standard rate
The IRS publishes a standard mileage rate each January for business, medical, and charitable travel. For 2026 the business rate is 72.5 cents per mile. This rate is designed to approximate the average operating cost for a typical American vehicle at average mileage. If your calculated cost per mile is below 72.5 cents, the IRS rate more than covers your costs when you claim business mileage. If it is above, the rate does not fully reimburse you and you may benefit from tracking actual expenses instead (ask a tax professional about the "actual expense method"). The medical rate for 2026 is 20.5 cents per mile, and the charitable rate remains fixed at 14 cents per mile by statute.
Using cost per mile to compare vehicles and plan trips
Cost per mile is the most useful number for comparing two vehicles head-to-head, because it normalises fuel economy differences, insurance differences, and depreciation differences into a single figure. A cheap-to-buy car with poor fuel economy and high insurance can cost more per mile than a pricier hybrid with low running costs. For trip planning, multiply your cost per mile by the trip distance to get a true cost that covers fuel, wear, and a share of your fixed costs - not just gas money. This is especially useful for delivery drivers, real estate agents, and other workers deciding whether a particular route is profitable at the reimbursement rate they receive.
IRS standard mileage rates (2024-2026)
| Year | Business (cents/mile) | Medical (cents/mile) | Charitable (cents/mile) |
|---|---|---|---|
| 2024 | 67.0 | 21.0 | 14.0 |
| 2025 | 70.0 | 21.0 | 14.0 |
| 2026 | 72.5 | 20.5 | 14.0 |
The IRS updates these rates each January. Business rates are used for tax deductions; charitable rates are set by statute.
Frequently asked questions
What is the average cost per mile to drive a car in the US?
The U.S. Department of Energy and AAA estimate the average all-in cost at roughly $0.55 to $0.75 per mile, depending on vehicle type, age, and local fuel prices. The IRS set the 2026 business standard mileage rate at $0.725 as a proxy for this average. Your actual figure can be higher or lower depending on your vehicle's depreciation, insurance costs, and how many miles you drive per year.
What costs should I include in a cost per mile calculation?
A complete calculation includes both variable costs (fuel, tires, oil changes and other maintenance) and fixed costs (annual insurance premium, annual depreciation, registration and license fees, and loan interest if the car is financed). Parking and tolls can be added if you want a comprehensive figure, though they are often excluded from standard comparisons.
Why does cost per mile drop when I drive more miles?
Fixed costs - insurance, registration, depreciation, and loan interest - are the same each year no matter how far you drive. Spreading those fixed costs over a larger number of miles reduces the per-mile share. Fuel and maintenance costs do rise with mileage, but typically not enough to offset the fixed-cost dilution. This is why high-mileage drivers and fleet vehicles often report lower per-mile costs than low-mileage personal cars.
How do I estimate annual depreciation?
The simplest approach is to look up the current market value of your car (using Kelley Blue Book or a similar guide) and multiply by 10-15% for a newer car or 8-10% for a car more than three years old. For a more precise figure, find the market value at the start of the year and again at the end, and use the difference. Cars depreciate fastest in the first two years and slow down considerably after year four or five.
Should I use the IRS standard mileage rate or track actual costs?
For tax purposes, you may use either method for business driving, but not both for the same vehicle in the same year. The standard mileage rate is simpler - you just track miles. The actual expense method requires you to log every cost and apply the business-use percentage. If your true cost per mile (as calculated here) is higher than the IRS rate, actual expenses may yield a larger deduction. Consult a tax professional before choosing.
How does cost per mile differ from fuel cost per mile?
Fuel cost per mile is simply your gas price divided by your MPG - for example, $3.50 per gallon at 30 MPG is $0.117 per mile. Total cost per mile adds fixed and variable non-fuel expenses on top of that. Fuel typically represents only 20-35% of the total per-mile cost for most drivers; depreciation and insurance combined often exceed fuel.
Is electric vehicle cost per mile lower than for a gasoline car?
For energy costs alone, yes - electricity is typically cheaper per mile than gasoline. However, the total cost per mile depends heavily on depreciation (EVs can depreciate faster in some segments), higher purchase price, insurance costs, and the cost of home charging equipment. Use this calculator with the electricity cost as your "fuel" input and your actual annual expenses to get a fair comparison.