How to calculate lease mileage overage
Your lease contract—not an advertisement—sets the annual mileage allowance and the charge for each additional mile. First convert the annual allowance into a whole-lease allowance. Then subtract that allowance from the miles driven during the lease and multiply any positive difference by the contract rate.
Example: a 10,000-mile lease running high
A 36-month, 10,000-mile-per-year lease includes 30,000 miles. If the vehicle is projected to use 42,000 lease miles, the overage is 12,000 miles. At $0.25 per mile, the estimated bill is $3,000. With 18 months left, saving about $166.67 per month would prepare for that estimate.
Why the projection can change
The forecast extends your average pace to date through the end of the lease. It is useful for planning, but it cannot know about future road trips, a new commute, a move, or months when the vehicle is driven less. Recheck the calculator every few months and use the actual odometer.
What to do if you are over the mileage pace
- Verify the exact allowance and per-mile rate in the signed contract.
- Ask the leasing company whether discounted prepaid miles are still available.
- Use the safe-miles result above as a realistic monthly driving budget.
- Set aside the monthly savings estimate instead of waiting for lease return.
- Use the lease buyout calculator before assuming that buying or trading the car will erase the overage.
Frequently asked questions
How are car lease mileage overage fees calculated?
Multiply the miles above your contract allowance by the per-mile charge in your lease. For example, 4,000 extra miles at $0.25 per mile would cost $1,000.
How many total miles are allowed on my lease?
Multiply the annual mileage allowance by the lease term in years. A 10,000-mile annual allowance on a 36-month lease provides 30,000 lease miles in total.
Is it cheaper to buy more lease miles in advance?
Sometimes. Compare the total added payments for the higher mileage tier with the cost of those same miles at the contract overage rate. The calculator on this page performs that comparison.
Can I trust a projected lease-end mileage?
It is a planning estimate based on your average driving pace so far. A job change, move, road trip, or other change in driving can make the final mileage different.
Sources and limitations
The Federal Trade Commission explains that leases ordinarily include an annual mileage limit and may charge for excess mileage. The CFPB recommends comparing total costs and reviewing the lease terms. This page is an estimate for planning; your signed contract and leasing company determine the actual charge.