Car-Free Savings Calculator See how much going car-free saves you — then watch it grow with compound interest

What Is the Car-Free Savings Calculator?

Owning a car costs a lot more than the loan payment: insurance, fuel, maintenance, parking, registration fees, and the most overlooked cost of all — depreciation. This free tool adds up every real cost of car ownership, compares it against what you'd actually spend on public transit, rideshare or occasional rentals instead, and tells you exactly how much going car-free would save you every month and year. Then it goes one step further: it simulates what happens if you invest those savings instead of spending them, using the same compound-growth math behind our FIRE calculator.

Important: results are estimates for planning purposes only. Real-world car costs and investment returns depend on your vehicle, location and market conditions — this is not financial advice.

The Hidden Cost Most Calculators Skip: Depreciation

Most people mentally track their loan payment, gas and insurance — but according to long-running annual driving-cost studies, depreciation is consistently one of the largest single components of car ownership cost, often larger than fuel or insurance combined. It's easy to ignore because no one ever sends you an invoice for it — your car simply becomes worth less every year. Learn more about how it works on Wikipedia's depreciation article.

Why Invest the Difference Instead of Just Saving It?

If you go car-free and simply let the extra cash sit in a checking account, it barely grows. But if you invest that same monthly amount consistently, compound interest means your money earns returns on top of returns — and the longer the time horizon, the steeper the growth curve becomes. The chart above plots two lines side by side: what your money looks like if it compounds versus what it looks like if you just stack up contributions with zero growth, so you can see the real dollar value that compounding adds.

How the Math Works

Total car cost = monthly loan/lease payment + fuel + parking + (annual insurance + maintenance + registration fees + depreciation) ÷ 12. Total car-free cost = public transit + rideshare + (annual occasional rental ÷ 12). The difference is your net monthly and yearly savings. The investment simulation then rolls forward year by year using: balance = balance × (1 + annual return) + yearly contribution — the same logic used in compound-interest and retirement calculators.

Frequently Asked Questions

Q1: How do I estimate depreciation?

A simple approach: take your car's current market value and multiply it by an estimated annual depreciation rate (roughly 15-20% for newer cars, 5-10% for older ones). For a more accurate number, compare last year's used-car resale price for your exact model/year to this year's price.

Q2: I still need to travel sometimes — is going car-free actually worth it?

That's exactly why the "Alternative Transportation Costs" section exists. It subtracts what you'd realistically spend on transit, rideshare and occasional rentals, so the savings figure reflects your real net benefit, not an unrealistic assumption that you'll never need to get anywhere.

Q3: What return rate should I use?

Long-term average annual returns for broad stock market index funds have historically been in the 6-8% range before inflation, though past performance never guarantees future results. Try a conservative rate first (4-6%) and adjust the slider to see how sensitive your outcome is.

Q4: Does this tool save or upload my numbers?

No. Everything runs locally in your browser — nothing is sent to a server, and refreshing the page resets the fields to their defaults. Feel free to enter your real numbers.