Driving to a client, a site visit, or a meeting is a business cost, and a mileage claim turns those driven miles into money back. The idea is simple: record how many business miles you drove, multiply by a per-mile rate, and add tolls and parking. This calculator does that arithmetic, but the claim is only as good as the record behind it, so the habits around the numbers matter as much as the numbers themselves.
Here is a worked example. You drive 120 business miles at a rate of 0.67 per mile, which gives a mileage amount of 80.40. Tolls of 8 and parking of 12 bring the total claim to 100.40. If you drove the same trip in both directions, enter the full round-trip distance, not just one way: 60 miles each way is 120 miles in total, and claiming only one way quietly loses half the claim.
The rate is the field you must never copy blindly. Official mileage rates vary by country, state, and year, and they change when fuel prices or tax rules change. Some systems set one rate for all vehicles, others set different rates by vehicle type or by distance band. This tool asks you to enter your own rate precisely because no single rate is correct everywhere, and a claim built on the wrong rate can be rejected or, worse, treated as an incorrect tax filing.
Miles and kilometres cause more errors than any other part of a claim. This tool works in miles, following the most common reimbursement unit, but if your system uses kilometres, convert before you enter: multiply kilometres by 0.621371 to get miles. A 200-kilometre trip is about 124 miles, not 200 miles, and entering the kilometre figure as miles would overstate the claim by more than half. Always check which unit your client or tax authority expects.
Only business miles count, and the line between business and personal driving needs care. Driving from home to a client site is normally business travel; driving from home to your usual office, if you have one, often is not. Commuting, personal errands added to a business trip, and detours for private reasons should be excluded. When a trip mixes business and personal driving, claim only the business portion and note how you split it.
A trip log is what turns a claim into evidence. For each trip, write the date, the destination, the purpose, and the miles driven, ideally on the day of the trip. A log kept in real time is believed; a log reconstructed months later from memory is not. Keep toll receipts and parking tickets with the log, because those costs are claimed on top of mileage and need their own proof. This calculator gives you the total, but the log is what defends it.
Claim mileage regularly, not once a year. Monthly claims keep the log fresh, keep cash flowing, and make errors easy to spot while the trip is still recent. A client who receives a small, well-documented claim each month pays it without argument; a client who receives a huge annual claim with a thin log asks questions. The same logic applies to tax filings: regular, documented claims are simply easier to defend.
Use this calculator at the end of each trip or each week, with your real miles and your real rate, and store the result with your trip log. Over a year, mileage is often one of a freelancer largest deductible or reimbursable costs, and the difference between claiming it properly and forgetting it can be hundreds or thousands. Miles you drove are money you spent; a calculator and a log make sure you get it back.