How to Use This Calculator
- 1
Enter Your Lease Details
Input your monthly lease payment, capitalized cost (negotiated vehicle/asset price), residual value (guaranteed end-of-lease value), and lease term in months.
- 2
Review Your Results
The calculator displays Implicit APR, Total Finance Charges, Total Lease Cost, Monthly Depreciation, Monthly Finance Charge, and Finance Charge % of Payment. The Insights card shows your payment breakdown, depreciation impact, and lease vs. loan comparison.
Example Calculation
A consumer wants to understand the true interest rate hidden in their 36-month auto lease.
Monthly Lease Payment
$450
Capitalized Cost
$35,000
Residual Value
$20,000
Lease Term
36 months
Results
Implicit Interest Rate (APR)
1.45%
Total Finance Charges
$1,200.00
Total Lease Cost
$16,200.00
Monthly Depreciation
$416.67
Monthly Finance Charge
$33.33
Finance Charge % of Payment
7.4%
Insights card shows payment breakdown ($416.
Tips
Compare Implicit APR to Auto Loan Rates
In the example, the 1.45% implicit APR is well below typical auto loan rates (6-8% in 2026). This makes the lease competitively priced from a financing perspective. If your lease APR exceeds loan rates, buying may be cheaper.
Negotiate the Money Factor
The money factor (0.00061 in the example) directly determines your APR. A money factor of 0.00200 = 4.8% APR, while 0.00300 = 7.2% APR. Always ask the dealer for the money factor and compare — even a small reduction saves hundreds over the lease.
Watch the Finance Charge Percentage
In the example, only 7.4% of each payment ($33.33 of $450) goes to interest — excellent. If this exceeds 20%, you're paying a steep financing premium. Negotiate a lower money factor or consider a shorter lease term.
The Lease Interest Rate Calculator reveals the hidden interest rate in your auto or equipment lease.
With a $450/month payment on a $35,000 asset with $20,000 residual over 36 months, the implicit APR is 1.45% (money factor 0.00061).
Total finance charges are $1,200 — just $33.33/month or 7.4% of each payment.
The remaining $416.67/month covers the $15,000 in depreciation.
The Lease Interest Rate Formula
The calculator determines the financing cost hidden within your lease payments by separating depreciation from interest.
Total Payments = Monthly Payment x Lease Term
Depreciation = Capitalized Cost - Residual Value
Finance Charge = Total Payments - Depreciation
Money Factor = Finance Charge / ((Capitalized Cost + Residual Value) x Lease Term)
Implicit APR = Money Factor x 2,400
Monthly Depreciation = Depreciation / Lease Term
Monthly Finance Charge = Finance Charge / Lease Term
The money factor is the lease industry's equivalent of an interest rate.
Multiplying by 2,400 converts it to a standard APR for direct comparison with auto loan rates.
Worked Example: Finding the Hidden APR in an Auto Lease
A consumer wants to know the true interest rate on their auto lease.
Inputs:
- Monthly Lease Payment: $450
- Capitalized Cost: $35,000
- Residual Value: $20,000
- Lease Term: 36 months
Step-by-step:
- Total Payments: $450 x 36 = $16,200
- Depreciation: $35,000 - $20,000 = $15,000
- Finance Charge: $16,200 - $15,000 = $1,200
- Money Factor: $1,200 / (($35,000 + $20,000) x 36) = $1,200 / $1,980,000 = 0.00061
- Implicit APR: 0.00061 x 2,400 = 1.45%
- Monthly Depreciation: $15,000 / 36 = $416.67
- Monthly Finance Charge: $1,200 / 36 = $33.33 (7.4% of payment)
At 1.45% APR, this lease is well below typical auto loan rates (6-8%).
Only $33.33 of each $450 payment goes to interest — the rest covers depreciation.
Interpreting Money Factors and APRs
The money factor is the key metric for evaluating lease financing.
Here's how to interpret it:
- Below 0.00100 (< 2.4% APR): Excellent — promotional or manufacturer-subsidized rate. The example's 0.00061 falls here.
- 0.00100 - 0.00200 (2.4% - 4.8% APR): Good — competitive financing, comparable to strong credit auto loans.
- 0.00200 - 0.00300 (4.8% - 7.2% APR): Moderate — in line with average auto loan rates. Worth negotiating down.
- Above 0.00300 (> 7.2% APR): High — you're paying a significant financing premium. Consider buying with a loan instead.
Always compare the implicit APR against current auto loan rates for your credit tier.
If the lease APR significantly exceeds what you'd pay on a loan, the convenience of leasing comes at a measurable cost.
Frequently Asked Questions
How is the implicit interest rate in a lease calculated?
The implicit APR is derived from the money factor. First, calculate total payments ($450 x 36 = $16,200), then depreciation ($35,000 - $20,000 = $15,000), then finance charges ($16,200 - $15,000 = $1,200). The money factor = $1,200 / (($35,000 + $20,000) x 36) = 0.00061. Multiply by 2,400 to get the APR: 0.00061 x 2,400 = 1.45%. This reveals the true cost of financing hidden in the lease.
What is a 'money factor' and how does it relate to APR?
A money factor is the lease equivalent of an interest rate, expressed as a small decimal. To convert to APR, multiply by 2,400. In the example, money factor 0.00061 x 2,400 = 1.45% APR. A 'good' money factor is below 0.00200 (4.8% APR). Dealers sometimes quote the money factor to obscure the true rate — always convert to APR to compare against auto loan rates.
What portion of my lease payment goes to interest vs. depreciation?
In the example, each $450 payment breaks down into $416.67 depreciation (92.6%) and $33.33 finance charge (7.4%). The depreciation portion covers the $15,000 the asset loses in value over 36 months. The finance charge is the lender's profit. A higher money factor shifts more of each payment toward interest — at 0.00300 money factor, the finance charge would be $99.99/mo instead of $33.33.