UK Mileage Calculator
Calculate fuel costs, litres used, and HMRC approved mileage claims for any journey. Includes MPG to L/100km conversion and tax reference tables.
Mileage & Fuel Calculator
Calculate journey costs, fuel used, and HMRC mileage allowances
Total distance of your journey in miles
Your vehicle’s fuel efficiency in Miles Per Gallon (UK)
Current price of fuel at the pump (e.g. 145p/L)
Used to determine if you qualify for the 45p or 25p HMRC rate
Journey Breakdown
Mileage and fuel cost calculation result
Enter your journey details and click Calculate to see your fuel costs, litres used, and HMRC claim.
UK Fuel & HMRC Rates
Quick reference for UK MPG to L/100km conversions and current HMRC Approved Mileage Allowance Payments (AMAP).
| Vehicle / Metric | UK MPG | L/100km | Notes |
|---|---|---|---|
| Large SUV / Performance | 25 MPG | 11.30 L/100km | Typical for older or larger vehicles |
| Family Hatchback (Petrol) | 35 MPG | 8.07 L/100km | Average for modern petrol cars |
| Family Hatchback (Diesel) | 45 MPG | 6.28 L/100km | Common for motorway driving |
| Hybrid Vehicle | 55 MPG | 5.14 L/100km | Typical for full or plug-in hybrids |
| Small City Car | 60 MPG | 4.71 L/100km | Highly efficient petrol models |
| Vehicle Type | First 10,000 Miles | Over 10,000 Miles | Notes |
|---|---|---|---|
| Cars and Vans | 45p per mile | 25p per mile | Highest tax-free allowance |
| Motorcycles | 24p per mile | 24p per mile | Flat rate regardless of mileage |
| Bicycles | 20p per mile | 20p per mile | Flat rate for cycling business journeys |
Mileage Calculator FAQ
Everything you need to know about calculating fuel costs, MPG, and HMRC mileage claims in the UK.
To calculate the fuel cost of a journey, divide your distance (in miles) by your vehicle’s MPG to find the gallons used. Multiply by 4.546 to convert to litres, then multiply by your fuel price per litre. Alternatively, use our free mileage calculator above to do this instantly.
For cars and vans, the HMRC Approved Mileage Allowance Payments (AMAP) are 45p per mile for the first 10,000 business miles in a tax year, and 25p per mile for every mile over 10,000. Motorcycles are 24p per mile, and bicycles are 20p per mile. These rates are tax-free if paid by your employer.
To convert UK MPG to litres per 100km (L/100km), divide 282.48 by your MPG figure. For example, 40 MPG is 282.48 ÷ 40 = 7.06 L/100km. Note that UK MPG is different from US MPG; this formula applies only to the UK Imperial gallon (4.546 litres).
Yes, if you work from home and it is not your choice (e.g., your employer requires it or you have no permanent office), your home is considered a permanent workplace. You can claim mileage for journeys to temporary workplaces, client sites, or other business-related trips, but not for your normal commute to a permanent workplace.
Actual fuel cost only covers the petrol or diesel you use. HMRC mileage allowance (AMAP) is a tax-free payment that covers fuel, wear and tear, insurance, road tax, and depreciation. You can claim AMAP from your employer, or claim tax relief on the difference if your employer pays you less than the HMRC approved rates.
Yes. If you are claiming mileage allowance from your employer or claiming tax relief from HMRC, you must keep a detailed mileage log. This should include the date of each journey, the destination, the business purpose, and the number of miles driven. HMRC may request this log to verify your claim.