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Car or Public Transport: Compare the Whole Household Route

PTC publishes distance-based bus and rail fares, concession fares and monthly passes. Use the fares that apply to each household member and the trips actually made. A no-car plan may still include occasional rides, car-sharing or rental; leaving those out understates it. The amounts below are invented worksheet inputs, not a claim about average Singapore spending.

Jump to the section you need

• Build both routes
• Worked example
• Measure time
• Check access
• Already own a car?
• Decision gates
• FAQ

Build complete routes over one period

Use the same number of months and count each cost once. Loan principal is already represented by purchase less exit value, so do not add every instalment as another economic cost. The route calculator accepts no-car public transport in its “other no-car access” field alongside rental or sharing. Use the affordability calculator separately for downpayment, instalments and cash buffer.

A five-year household example

Keep the hypothetical car route used in our car-versus-rides guide: S$70,000 vehicle value loss, S$47,500 running costs, S$5,000 finance interest and S$6,000 rides with a car. Total: S$128,500. Suppose the no-car household instead spends S$500 a month on bus and rail, S$600 on rides and S$150 on occasional rental or sharing.

The transit-led route costs S$53,500 less over five years on these inputs, or about S$892 a month. That is the cash gap to weigh against access and time; it is not the monthly car instalment. A lower car sale value widens the gap. A higher need for backup rides narrows it.

Measure time without pretending it is a bill

For recurring routes, record door-to-door time at the actual day and hour for each mode: walking to a stop, waiting, transfers, pickup, parking and the return trip. If the car truly saves five hours a week for 52 weeks a year, that is 1,300 hours over five years. In the example, S$53,500 ÷ 1,300 is about S$41 per credible hour saved. This is an implied price of time, not a wage, cash saving or reason to buy. If the car saves only two hours a week, the implied price rises to about S$103 an hour.

Do not count time saved twice as both a wage gain and a convenience benefit. If a route is impossible by public transport, price a ride or rental fallback rather than assigning an invented travel time.

Test the trips public transport cannot cover alone

List exact-time school, work and care journeys, late trips, mobility constraints, luggage and simultaneous travel by household members. For each, check whether rail/bus works, what a ride would cost and whether shared access is practical. Ride-hail flat fares are dynamic and shown at booking, so use completed fares and a busier scenario rather than a single quiet-hour quote. A cheaper plan that repeatedly misses a critical journey fails the access test.

If you already own a car, reset the decision date

The old purchase price is sunk. For a keep-versus-sell choice, start with what you could receive net today, what debt must be settled, and the costs and exit value from today onward. Compare that with the no-car route from today onward. Do not reuse a new-purchase worksheet unchanged or pretend that selling releases cash equal to the original price. See when keeping an old car becomes false economy for the retained-car decision.

Use three gates

1. Cost: compare full routes with conservative car exit and a busy alternative-transport month.
2. Access: test the exact routes and fallbacks, including simultaneous family needs.
3. Cash flow: if buying, check downpayment, instalments and remaining buffer even when ownership wins on long-run cost.

If transit covers most trips but selected days still need a vehicle, compare weekend rental and car-sharing versus rides before treating the choice as all car or no car.

FAQ

Is public transport always cheaper?

No universal answer follows from the fare table. Count the whole household's transit, rides and backup access and compare with the specific car's full cost.

How should I value time?

Measure actual hours saved. Dividing the cash gap by those hours shows what you would pay per hour of convenience; whether that is worthwhile is a separate household decision.

What if I already own the car?

Compare keep versus sell from today, using today's net sale value and settlement amount rather than the historic purchase price.

References

• PTC: current public transport fares and passes
• PTC: point-to-point fares
• LTA: car-sharing

Last updated: 26 Sep 2026 · Editorial Policy · Advertising Disclosure · Corrections