Auto
Mileage Calculator
- Browser-based
- No signup
Enter start and end odometer readings and fuel used to calculate miles per gallon, distance driven, and metric efficiency conversions. Optionally add fuel price for trip cost and cost per mile.
100% Client-Side
Your data never leaves your computer.
How to use this tool
1. Enter start and end odometer readings, or total miles and reimbursement rate. 2. Add optional round-trip toggle if shown. 3. Click Calculate. 4. Review distance and reimbursement total. 5. Confirm your employer’s mileage rate before expensing.
Worked example
Example: odometer 12,100 to 12,250 at $0.67/mile yields 150 miles and about $100.50 reimbursement.
How it works
Enter your start and end odometer readings and the fuel used for that trip (typically from a full tank fill-up). The calculator finds distance driven, miles per gallon, and metric equivalents. Optionally add fuel price to estimate trip fuel cost and cost per mile.
Limitations
Results are based on the inputs you provide and may not cover every edge case. This tool is for general use and is not professional advice.
Privacy and file handling
Your data is processed in your browser and is not uploaded to our server.
Frequently asked questions
How is MPG calculated?
Distance is end odometer minus start odometer. Miles per gallon equals distance divided by gallons of fuel used.
When should I record odometer readings?
For the most accurate fill-up mileage, record the odometer each time you fill the tank completely, and enter the gallons added at the current fill-up.
Is fuel price required?
No. Fuel price is optional. When provided, the calculator also estimates total fuel cost and cost per mile for the trip.
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