About the Mileage Calculator
Mileage claims need two things: how far you drove and what rate applies. This mileage calculator works out the distance from your starting and ending odometer readings, or from a trip distance you type, and can double it for round trips and multiply it by the number of trips. It then multiplies the total by the rate per mile or kilometre to give the amount of reimbursement or deduction, and shows the total in both miles and kilometres. You choose the rate, since official rates change every year and differ by country.
Updated October 2026
How to use the Mileage Calculator
- 1Choose miles or kilometres.
- 2Enter the odometer readings at the start and end, or leave them empty and type the trip distance.
- 3Enter the number of trips and say whether each one is a round trip.
- 4Type your rate per mile or kilometre.
- 5Read the total distance and the amount owed, then copy it into your expense form.
Keeping an accurate log
A good mileage log takes seconds per trip if you do it at the time. Photograph the odometer at the start and end of each business day or journey, or use a notebook in the car. Note the reason for the trip, since personal and commuting miles are often not claimable. At the end of the month, add the distances and enter the total here to get the amount for your expense report.
Points to check before you claim
- Confirm which journeys count as business use under your employer's or tax rules.
- Use the rate for the right year and type of driving.
- Check whether a rate applies to the first miles only or to all miles.
- Keep receipts for tolls and parking, which are often claimed separately.
- Do not claim the same journey twice through different schemes.
Other tools for travel planning
Use the Speed Calculator to estimate how long a trip will take, the Fuel Economy Calculator to see fuel used and cost per distance, and the Unit Converter for any other measurement. The Tip Calculator and Salary Calculator help with other expense and pay questions. This tool does arithmetic only and is not tax advice, so check your own tax rules.
Features
- Distance from two odometer readings
- Or a typed trip distance
- Round trips and repeated trips
- Totals in both miles and kilometres
- Reimbursement amount at your own rate
- Checks that the ending reading is higher
- Runs in your browser
Frequently asked questions
How do I calculate mileage from the odometer?
Subtract the starting reading from the ending reading. If the odometer showed 10,000 at the start and 10,250 at the end, you drove 250 miles. Write both readings down on the day, because it is hard to reconstruct them later and tax authorities may ask for a log.
What rate should I use?
Use the rate your employer sets or the official rate for your tax authority and year. These change regularly and differ between countries and for business, medical and charity driving. The calculator does not assume one, so enter the figure that applies to you.
How do I convert miles to kilometres?
Multiply miles by 1.609344 to get kilometres, and divide kilometres by 1.609344 to get miles. 100 miles is about 160.9 km. The results table shows both totals so you can fill in forms that need either unit.
How do I count a round trip?
Choose the round trip option and enter the one-way distance. The calculator doubles it. If you make the same trip several times, enter the number of trips as well, for example 20 round trips of 12 km each is 480 km in total.
What records should I keep for mileage claims?
Typically the date, start and end points, purpose of the trip, and the odometer readings or distance. Many tax authorities and employers require a contemporaneous log, so a note kept at the time is stronger than one written at year end.
Does this calculator include fuel costs?
No. Mileage reimbursement rates are a flat figure per mile or kilometre set to cover vehicle costs. If you want to know how much fuel a trip uses, try the Fuel Economy Calculator.