Lease Calculator

Before you calculate

Use this calculator when you want a generic lease estimate for equipment, a vehicle, or another asset and the key inputs are asset value, residual value, term, and either an annual rate or quoted payment. Use Auto Lease when a vehicle quote uses money factor, down payment, trade-in value, or sales tax assumptions. Use Auto Loan, Loan Payment, APR, Payment, or Amortization when the question is a loan rather than a lease. Use CFPB Regulation M and eCFR Part 1013 for consumer lease disclosure claims, IFRS 16 or FASB ASC 842 materials for accounting treatment, and contract, tax, title, insurance, legal, or provider sources before treating real lease terms as settled.

Formula summary

leaseTermMonths = max(1, round(leaseYears * 12 + leaseMonths)). depreciationAmount = max(0, assetValue - residualValue). In monthly-payment mode, monthlyRate = interestRate / 100 / 12. If monthlyRate is 0, monthlyPayment = (assetValue - residualValue) / leaseTermMonths. Otherwise, residualPresentValue = residualValue / (1 + monthlyRate)^leaseTermMonths and monthlyPayment = ((assetValue - residualPresentValue) * monthlyRate) / (1 - (1 + monthlyRate)^(-leaseTermMonths)). In interest-rate mode, the app keeps the quoted monthly payment; if the payment is at or below the zero-rate payment, the solved rate is 0, otherwise it searches between 0 and 100 percent for 120 iterations. totalMonthlyPayments = monthlyPayment * leaseTermMonths, totalInterest = totalMonthlyPayments - depreciationAmount, and the principal and interest shares divide depreciation and interest by total monthly payments.

Worked example

Example: $20,000 asset with an $8,000 residual

With the default inputs, the term is max(1, round(3 * 12 + 0)), or 36 months. Depreciation amount is $20,000.00 - $8,000.00, or $12,000.00. The 5.581 percent annual rate becomes a 0.4651 percent monthly rate. The $8,000.00 residual is discounted to about $6,769.31 today, and the remaining value is amortized into a $400.00 monthly payment. Total monthly payments are $14,399.86, total interest is $2,399.86, principal share is 83.33 percent, and interest share is 16.67 percent. In the quoted-payment fixture, a $400.00 payment solves to an effective rate of 5.58 percent.

The example shows how the app combines residual present value, term, and rate. It does not price real lease fees, determine accounting treatment, quote a lessor payment, or recommend whether to lease or buy.

Assumptions

• The model uses a generic present-value lease structure with whole-month term normalization, entered asset value, entered residual value, and a nominal annual rate converted to a monthly rate. It does not model money factors, cap-cost reductions, sales tax, deposits, acquisition fees, maintenance, insurance, or purchase-option fees.
• The displayed Interest/return rate is the app's solved effective annual rate for this equation. It is not a legal APR, Regulation M disclosure, accounting discount rate, lender approval term, provider quote, or tax treatment.
• If residual value is higher than asset value or the quoted payment is very low, depreciation and total-interest shares can behave differently from a typical lease quote. Scoped independent comparator checks may support overlapping math internally, but CFPB, eCFR, IFRS, FASB, FTC, tax, title, contract, insurer, provider, regulator, and legal sources are needed before making real disclosure, accounting, tax, fee, approval, contract, consumer-rights, or jurisdiction-specific claims. Results are educational estimates, not financial, legal, tax, accounting, lending, vehicle, equipment, or personalised advice.

Common mistakes to avoid

• Treating the monthly payment as the full contract cost. The calculator excludes taxes, deposits, acquisition fees, mileage charges, maintenance, insurance, purchase-option fees, and other contract-specific charges.
• Using the generic Lease Calculator when the actual quote is an auto lease with money factor, down payment, trade-in value, sales tax, mileage, and due-at-signing terms. The Auto Lease Calculator is built for that narrower vehicle workflow.
• Reading the solved Interest/return rate as an official APR, accounting discount rate, or legal disclosure. It is only the rate that makes this calculator's present-value equation match the quoted payment.

Methodology and sources

This calculator is an original implementation based on the app's documented generic lease present-value formulas, fixed planning assumptions, deterministic fixtures, edge cases, rounding policy tests, and internal validation. It is not copied from a single source.

Outputs are checked with deterministic fixtures, edge cases, rounding policy tests, and internal validation artifacts. The result remains an educational estimate, not a consumer lease disclosure, not an accounting lease calculation, not a legal APR disclosure, lessor quote, contract review, tax answer, title or registration estimate, insurance quote, approval decision, asset recommendation, or personalised advice.

Formula version 2026.05.22-generic-lease-present-value. The version marks the calculation logic and validation fixture set used for this estimate.

• CFPB Regulation M and eCFR 12 CFR Part 1013 should be used before copy discusses consumer lease disclosures, payment schedules, early-termination notices, purchase-option disclosures, advertising, renegotiations, assumptions, or legal consumer-lease terminology.
• IFRS 16, FASB ASC 842 materials, accounting policy, auditor, or finance-team sources should be used before copy discusses lease liabilities, right-of-use assets, finance-versus-operating lease classification, financial statement treatment, discount rates, or accounting compliance.
• FTC auto marketplace materials, dealer or lessor documents, lender or provider contracts, state tax authorities, DMV or title agencies, equipment-vendor documents, insurer documents, regulators, legal sources, and current contract materials should be used before copy discusses vehicle or equipment terms, taxes, title, registration, fees, mileage, wear, insurance, residual values, purchase options, approval, consumer rights, product-specific terms, or jurisdiction-specific claims.

Estimate only

The result is educational and is not financial, tax, legal, lending, investment, or regulated advice. Real provider terms, fees, rates, taxes, and personal circumstances can change the final answer.

Formula and help: read the full lease calculator methodology notes.

Related reading

• How Calcs.finance validates calculator formulas
• Estimate limitations and not-advice disclaimer

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