Mileage Overage Calculator
Estimate what exceeding your mileage allowance costs at turn-in — and whether buying extra miles up front would save you money.
Often 15–30¢ per mile.
Discounted rate to buy miles now.
Allowance 36,000 vs. expected 45,000
Buying miles up front saves $630 versus paying at turn-in.
Pre-purchased miles are usually non-refundable if you don't use them.
These results are only as accurate as the figures you enter. Double-check every number against your actual contract.
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Check my full leaseFrequently asked questions
How much does going over your lease mileage cost?
You pay a per-mile overage fee for every mile above your total allowance, charged at turn-in. Multiply your projected excess miles by the per-mile rate (often 15–30¢) to estimate the bill.
Is it cheaper to buy extra miles up front?
Usually yes. Many leases let you pre-purchase miles at a lower rate than the at-turn-in overage rate. If you know you'll drive more than the allowance, buying miles up front locks in the cheaper rate — but you don't get refunded for miles you don't use.
What's a common mileage allowance?
Allowances are commonly 10,000, 12,000, or 15,000 miles per year, but these are not guaranteed — use the exact allowance and per-mile overage rate printed on your own contract. The tool converts your annual allowance across the full term so you can compare it to how far you actually expect to drive.
What if I'll come in under the allowance?
Then there's no overage to worry about, and you should not pre-buy miles — unused prepaid miles are commonly non-refundable, though you should confirm the exact terms in your contract. This calculator will show zero excess when your projected mileage is within the allowance.