Leasing

The money factor, and how to convert it

The money factor is an interest rate in disguise. Here is a card for undoing the disguise, and one example of doing it on a real-looking quote.

Budget Pilot · September 28, 2026 · 4 min read

Money factor ⇄ rate

rate % = MF × 2400 · MF = rate % ÷ 2400

Factor → rate

MF	≈ rate	rent / mo per $10k*
0.00050	1.20%	$5.00
0.00075	1.80%	$7.50
0.00100	2.40%	$10.00
0.00125	3.00%	$12.50
0.00150	3.60%	$15.00
0.00175	4.20%	$17.50
0.00200	4.80%	$20.00
0.00225	5.40%	$22.50
0.00250	6.00%	$25.00
0.00275	6.60%	$27.50
0.00300	7.20%	$30.00
0.00350	8.40%	$35.00
0.00400	9.60%	$40.00

Rate → factor

rate	≈ MF
1%	0.00042
2%	0.00083
3%	0.00125
4%	0.00167
5%	0.00208
6%	0.00250
7%	0.00292
8%	0.00333
9%	0.00375
10%	0.00417

*Per $10,000 of capitalized cost plus residual, not per $10,000 of car. Rates in this card are the conventional ×2400 equivalent, not a disclosed APR. Figures are arithmetic, not anyone's offer.

That card is the whole tool. The rest of this page explains why it works, what it leaves out, and then puts it to use on one quote.

Why 2400

A lease charges rent on money the leasing company has tied up in your car. At signing that amount is the capitalized cost; at the end it is the residual. Averaged over the term, the balance sits near the midpoint of the two. A money factor is simply an annual rate that has already been divided by 12 (to make it monthly), by 100 (to turn a percentage into a decimal) and by 2 (to apply it to the sum of cap cost and residual instead of their average). Twelve times one hundred times two is 2400.

That is also why the rent charge formula adds the two figures rather than subtracting them: monthly rent charge = (cap cost + residual) × money factor. The full payment, with the depreciation fee alongside it, is built line by line in how a lease payment is calculated.

What the card will not tell you

The ×2400 figure is a convention for comparison. It is close to what a loan at that rate would cost on the same average balance, but it is not a legal disclosure. Consumer lease paperwork generally shows a total rent charge and the figures behind it rather than an annual percentage rate, so the number you calculate is your own translation. If your contract's stated rent charge disagrees with your arithmetic, the contract is the authority and the difference is a question to ask.

You may also hear the factor said aloud without its leading zeros, as a whole number or with the decimal moved. Ask for it written out as a decimal and read it back. Misplacing one zero turns a modest rate into an absurd one, or the reverse.

And the card cannot tell you whether a factor is good. It only tells you what it is. A lessor's base rate for your credit profile, and any amount added on top of it at the dealership, are not printed on the window. The Consumer Financial Protection Bureau's pages on auto leasing, at consumerfinance.gov, are a sensible place to read about asking for the terms in writing.

One conversion, worked through

Suppose a lease worksheet lists these figures. They are illustrative, invented to show the method.

cap cost ........... $36,000
residual ........... $21,000
term ............... 36 months
money factor ....... 0.00215

Step one: convert. The factor sits between two rows of the card, 0.00200 and 0.00225, so you already know the answer lands between 4.80% and 5.40%. The exact figure:

0.00215 × 2400 = 5.16% (conventional equivalent)

Step two: price it. Add cap cost and residual, then multiply.

36,000 + 21,000 = 57,000
57,000 × 0.00215 = $122.55 rent per month
122.55 × 36 = $4,411.80 rent over the lease

The card gets you there without a calculator: 57,000 is 5.7 lots of $10,000, and at 0.00215 each lot costs $21.50 a month, a little past halfway between the $20.00 and $22.50 rows. 5.7 × 21.50 = $122.55.

Step three: compare. The value of converting is that it lets you ask a sharper question. Say you had reason to expect something nearer 0.00175, the 4.20% row.

57,000 × 0.00175 = $99.75 per month
122.55 − 99.75 = $22.80 per month
22.80 × 36 = $820.80 across the term

Four ten-thousandths of a money factor, a figure most people would round to nothing, comes to more than eight hundred dollars on this lease. On the card, each 0.0001 step is worth 0.24 percentage points of rate and $1 a month for every $10,000 of cap cost plus residual. Here that is $5.70 a month per step, and four steps is $22.80.

Running it the other way

Sometimes the conversation starts from a percentage instead: an ad or a salesperson mentions a rate, and the contract later shows a factor. The right-hand side of the card is for that. A stated 4% should appear on paper as roughly 0.00167; 6% as 0.00250. If the paperwork shows 0.00250 after a conversation about 4%, that gap is 0.00083 of factor, which on the example's $57,000 of cap cost plus residual is 57,000 × 0.00083 ≈ $47 a month. Nobody has to have misled anyone for that to happen; rates get discussed loosely and written precisely. The card simply lets you notice before you sign rather than after.

Using the card at a desk

Three habits make it earn its place. Ask for the factor in writing before discussing the payment, since the payment is where every other variable can quietly compensate. Convert it on the spot so you are talking in the units you already understand from loans. And price any difference over the whole term, the way step three does, because a monthly number of $22.80 sounds like a rounding error until it has been multiplied by thirty-six.

Fold it in half, then, and keep it with the registration.