Car Savings Calculator: Monthly Amount to Buy a Car
Work out how much to save each month to buy a car with cash by a target date — and skip the interest a loan would charge.
Adjust the inputs and select Calculate for a full breakdown.
Compare Common Scenarios
How the numbers shift across typical situations for this calculator:
| Scenario | Monthly contribution | Total contributed | Growth toward goal |
|---|---|---|---|
| $30k · 3% · 3yr | $797.44 | $28,707.71 | $1,292.29 |
| $18k · 2.5% · 2yr | $732.19 | $17,572.49 | $427.51 |
| $45k · 4% · 5yr | $678.74 | $40,724.61 | $4,275.39 |
| $12k · 3.5% · 4yr | $233.27 | $11,197.06 | $802.94 |
How This Calculator Works
Enter the cash price of the car, the rate your savings earn, and how long you have. The calculator solves for the monthly contribution that reaches the price, and shows how much of it is your deposits versus interest earned.
The Formula
Required Monthly Saving (Sinking Fund)
FV = goal amount, r = monthly rate (annual ÷ 12), n = number of months
Worked Example
Saving for a $30,000 car over 3 years at a 3% return needs about $797 a month. Deposits make up roughly $28,700 of it, with interest adding the rest — and no loan interest is paid at all.
Key Insight
Saving up and paying cash flips the math of a car loan: instead of paying interest to a lender, you earn a little interest yourself. The trade-off is waiting, and the risk that the car's price rises before you buy.
Frequently Asked Questions
Is it better to save up or take a car loan?
Saving avoids loan interest and the risk of owing more than the car is worth. A loan gets you the car sooner. The right choice depends on need and on the loan rate.
What price should I enter?
Use the full out-the-door cash price, including taxes and fees. For a used car, allow some margin, since prices shift between now and your purchase date.
Where should I keep car savings?
For a purchase within a few years, a safe account such as a high-yield savings account suits it better than investments that could fall in value.
What if car prices rise before I buy?
Vehicle prices move over time. Revisit the goal against the cited new-vehicle price trend and adjust the monthly contribution if needed.
Should I save the full price or a down payment?
Either works. Set the goal to the full cash price to avoid a loan, or to a down payment if you intend to finance the rest.
Related Calculators
Data Sources & Benchmarks
This calculator draws on 3 independent, dated sources. The starting values for savings return rate are taken from the benchmarks below and refresh whenever the snapshots are updated.
Methodology & Review
The required monthly contribution solves the future-value-of-an-annuity formula for the payment that reaches the car's price. The model compounds monthly at a steady savings rate.
Written by Ugo Candido · Last updated May 17, 2026.