The Finance Algorithm
§ Tool · tier 1 · independent

Lease vs Buy Calculator.

Compare the cost of leasing versus buying a car outright

CalculatorFree, no signupOn-deviceupd May 2026
Inputs
Your numbers
$
$45k

Full purchase or lease base price

$
$650

Monthly lease cost quoted

36
$
$20k

Price to buy at end of lease

%
7.5%

Rate if you bought outright

60
$
$5k
15,000

Expected yearly driving (lease has limits)

Math updates live as you change inputs · AI runs on submit

Awaiting inputs

Move the sliders or type in the form on the left — the math updates live as you go. Click Get AI verdict when you want a written analysis.

Lease or buy? Each has pros and cons for different situations. This calculator compares the total cost and helps you decide which option suits your lifestyle and budget.

§ Worked examples

Real-world scenarios

3-Year Comparison

$45,000 car: Lease at $650/month for 36 months ($18,000 residual) vs buy at 7.5% for 60 months.

Inputs

price:45,000lease:650leaseTerm:36loanRate:7.5

Leasing costs $23,400 over 3 years with nothing at the end. Buying: $27,000 in payments but $25,000+ in equity.

§ FAQ

Questions Australians ask

§ Glossary

Plain-English definitions

Residual Value
The guaranteed future value at lease end - the price to buy the car if you want to keep it.
Kilometer Allowance
Maximum km included in the lease. Excess km attract fees of 10-30 cents/km.
Equity
The value you've built in an owned car (market value minus remaining loan).