Lease Mileage Calculator - Limits & Overage Cost

Closed-end vehicle leases cap the miles you can drive. The allowance is usually stated as a term total, such as 36,000 miles on a three-year lease, or as 10,000–15,000 miles per year. Drive more than the cap and the lessor bills excess miles at a stated per-mile rate. A lease mileage calculator annualizes your current pace so you can see a projected overage before the turn-in inspection. The lease mileage calculator sets monthly allowance = total mileage limit ÷ lease duration in months. Miles remaining = limit − current mileage. Projected end mileage = current mileage ÷ months elapsed × lease duration, a straight-line extrapolation. Projected overage miles = max(0, projected end mileage − limit). Projected overage cost = overage miles × the per-mile rate. On a 36-month, 36,000-mile lease, 15,000 miles after 18 months leaves 21,000 miles and projects 30,000 miles at term, so the pace is under the cap. The same term with a 30,000-mile cap, 20,000 miles after 18 months, and $0.20 per mile projects 40,000 end miles and a $2,000 overage. A 24-month, 24,000-mile lease with 11,000 miles after 12 months projects 22,000 miles and no overage. The projection assumes you keep the same monthly pace. A summer road trip or a new commute can break that line. Some contracts count miles at turn-in only; others sell prepaid extra miles at a cheaper rate than the excess-mile penalty. Wear-and-tear charges are separate. The calculator does not prorate by days inside a month and does not cap overage at a lease-end purchase. Use it as an early warning, then buy extra miles or adjust driving if the projected cost is material. Some leases reset the odometer basis after a refinance or extension; using the original limit against a new term will misstate both remaining miles and overage. Recalculate whenever the contract term or prepaid-mile package changes.