Money Factor Calculator (lease money factor ↔ APR & monthly rent charge)

Understanding the money factor calculator — concept and principle

Car leases quote their finance charge as a money factor, a small decimal such as 0.0025, instead of an interest rate. This calculator converts between money factor and APR and, if you enter the capitalized cost and residual value, works out the monthly rent charge and base payment.

A 0.0025 money factor equals about 6% APR; rent charge $145 plus depreciation $388.89 gives $533.89 a month before tax.

How it is calculated

APR (%) ≈ money factor × 2,400; money factor ≈ APR ÷ 2,400.
Monthly rent charge = (adjusted capitalized cost + residual value) × money factor.
Monthly depreciation = (cap cost − residual) ÷ lease months.
Base monthly payment = depreciation + rent charge, before tax.

The principle

In a lease you pay for the car's loss of value plus a finance charge on the money tied up in it. The amount financed falls from the cap cost at the start to the residual at the end, so the average balance is about (cap cost + residual) ÷ 2. Charging monthly interest of APR ÷ 12 on that average equals (cap cost + residual) × APR ÷ 24. So the money factor is APR ÷ 24 as a decimal, which is APR in percent ÷ 2,400. The conversion is a close approximation of the true rate.

Worked example

Default inputs: money factor 0.0025, cap cost 36,000 USD, residual 22,000 USD, 36 months.

Equivalent APR = 0.0025 × 2,400 = 6%.
Rent charge = (36,000 + 22,000) × 0.0025 = 145.00 USD a month; over 36 months 5,220 USD.
Depreciation = (36,000 − 22,000) ÷ 36 ≈ 388.89 USD a month.
Base payment = 388.89 + 145.00 = 533.89 USD before tax.

Each point is the calculator re-run with only “Money factor (lease rate)” changed; the gold point is the default example. Change the inputs above and this chart follows your numbers.

Money factor (lease rate)	Equivalent APR
0.000625	1.5%
0.00125	3%
0.00187	4.5%
0.0025	6%
0.00313	7.5%
0.00375	9%
0.005	12%

How to read the result

Convert every lease quote to an APR and compare it with current auto loan rates. A money factor higher than the lender's base rate for your credit tier may include a dealer mark-up, which is often negotiable. Remember that the payment also depends on the cap cost (which you can negotiate) and the residual (set by the leasing company).

Common mistakes

Reading 0.0025 as 0.25% a year; it corresponds to about 6% APR.
Comparing payments without checking the cap cost and fees.
Forgetting sales tax, which in many US states is added to each payment.
Ignoring acquisition and disposition fees.

Keep in mind: The conversion approximates the lease's true interest rate. Taxes, fees and dealer mark-ups are not included. This is not financial advice.

Frequently asked questions

What is a good money factor?

One that converts to an APR close to current auto loan rates for borrowers with your credit.

Why multiply by 2,400?

Money factor = APR ÷ 24 as a decimal; converting to percent multiplies by 100, giving 2,400.

Can I negotiate the money factor?

Dealers can sometimes add a mark-up to the lender's buy rate; asking for the base rate is common advice.

Sources: Federal Reserve Board, Keys to Vehicle Leasing · Consumer Financial Protection Bureau, auto lease consumer guidance

Checked 9 Nov 2026. Lease payment = depreciation charge + rent charge, rent charge = (capitalized cost + residual) × money factor, money factor ≈ APR ÷ 2,400: standard US auto-lease arithmetic (industry convention; our derivation from the average balance).

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