Lease Break-Even Mileage Calculator
Annual miles where lease total cost equals buying the car outright.
Find the annual mileage at which leasing a car costs the same as owning it across a 3-year horizon — above and below the line are different decisions.
What this tool does
This calculator estimates the annual mileage at which the total cost of leasing a car equals the total cost of buying and owning it outright. The result shows a break-even point: drive fewer miles annually, and ownership becomes cheaper; drive more, and leasing appears more economical. The calculation compares your monthly lease payment against an equivalent monthly ownership cost—covering loan repayment, maintenance, insurance, and depreciation—then factors in your annual mileage allowance and the per-mile overage penalty. The difference between monthly costs, when multiplied across a year, creates a budget available to cover excess mileage charges. By dividing this budget by your per-mile overage rate, the calculator reveals how many penalty miles that budget absorbs, added to your base allowance. This result illustrates a theoretical cost equivalence only and assumes costs remain stable. Individual circumstances vary; actual ownership and lease terms differ by vehicle, region, and personal usage patterns.
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Formula Used
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Disclaimer
Results are estimates for educational purposes only. They do not constitute financial advice. Consult a qualified professional before making financial decisions.
350/month lease vs 400/month ownership-equivalent at 15p/mile overage: the lease wins by 50/month. Break-even mileage is the point where penalty miles eat the savings. Below that mileage, leasing is cheaper; above, ownership wins — often with a large swing.
How to use it
Enter monthly lease cost, equivalent monthly ownership cost (depreciation over 3 years plus maintenance and insurance), annual mileage allowance on the lease, and per-mile overage charge.
What the result means
Primary is the break-even annual mileage. Secondary shows monthly savings at the allowance, penalty cost at the break-even point, and 3-year totals for each scenario.
Hidden cost of lease overage
15-25p per overage mile is standard. 5,000 miles over allowance is 750-1,250 extra — often the difference between 'lease saves money' and 'lease costs more'. Underestimating real annual mileage is the most frequent oversight.
Run it with sensible defaults
Using monthly lease cost of 350, equivalent monthly ownership of 400, annual mileage allowance of 10,000, per-mile overage of 0.15, the calculation works out to 14,000 miles. The defaults are meant as a starting point, not a recommendation.
The levers in this calculation
The inputs — Monthly Lease Cost, Equivalent Monthly Ownership, Annual Mileage Allowance, and Per-Mile Overage — do not pull with equal force. Not every input has equal weight. Adjusting one input at a time toward extreme values shows which ones move the result most.
How the math works
Annual monthly savings (own minus lease, times 12) is the budget available to pay penalty miles. Dividing by per-mile rate gives extra miles that penalty would cost, above the allowance. Total break-even miles is allowance plus those extra miles.
When the result says "wait"
If the payback is longer than you expect to keep the item, the math says no. That's useful information — not everything has to earn its keep financially, but knowing when something doesn't means the decision to buy it anyway is deliberate.
What this doesn't capture
Purchase decisions rarely come down to payback alone. Reliability, time saved, enjoyment, and alternatives outside the calculation all matter. The figure gives you the money side cleanly so you can weigh it against everything else honestly.
At 10,000 annual miles with £0.15 overage charges, your break-even point is 14,000 miles miles per year.
Inputs
This example uses typical values for illustration. Adjust the inputs above to match a specific situation and see how the result changes.
Sources & Methodology
Methodology
The calculator computes the annual mileage at which total lease costs equal total ownership costs. It first calculates the annual cost difference between ownership and leasing by taking the monthly gap and multiplying by 12. This annual difference represents the budget available to absorb overage penalties. The calculator then divides this budget by the per-mile overage charge to determine how many miles beyond the allowance can be driven before penalties exhaust the cost advantage. Break-even mileage is the sum of the annual allowance and these additional penalty-free miles. The model assumes constant monthly costs, a linear overage penalty structure, and does not account for upfront fees, residual value variability, maintenance timing, or tax treatment differences between leasing and ownership.
References
Frequently Asked Questions
What's equivalent ownership cost?
Include insurance?
What if I go over allowance slightly?
Does lease include maintenance?
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