About the data
A price is a judgement, not a fact. This page sets out what ours is based on.
Where the data comes from
Estimates are built on asking prices, not sale prices. Asking prices are public and visible daily; sale prices are not registered publicly in Hong Kong.
- Simulated listings; the source labels (28car, Carousell, dealer) are generated too
- Only make, model, year, mileage, owners, trim and district are kept
- No seller identity or contact details are collected
How the sample is chosen
A car is only compared with the same model, within one year either side. The more comparable listings there are, the narrower the range.
- 30 or more comparables: high confidence, and a range of about 8% either side
- 10 to 29 comparables: medium confidence, and a wider range
- Under 10: labelled a thin sample. With none at all we publish no number
How often it updates
Only the last 90 days of listings count. Nothing older can drag today's estimate down.
- The demo corpus is generated once and does not refresh daily
- The trend buckets every listing by the ISO week it was posted and plots that week's median across 13 weeks; weeks with fewer than two listings are left blank
- In this demo the whole corpus is frozen at 15 September 2026
How an estimate is built
It starts from the new-car price, adjusts for age, mileage, owners, trim and condition, then aligns to what comparable cars are actually listed at.
- New price × trim × depreciation by age × mileage × owners × condition
- How wide the range is depends on the sample size, never on the price
- Every factor is shown with its direction and its percentage
Limits and disclaimer
An estimate is a reference. It is not an offer and it is not a guarantee.
- Asking prices usually sit above sale prices, typically by a few per cent
- Accident, flood, modification and service history are invisible to us unless you tell us
- Rare models and cars that have only just launched carry thin samples and much lower accuracy
Privacy and analytics
We measure how the site is used so valuations and search get better.
- OpenPanel records anonymous usage (such as searches and valuations) without cookies
- Google Analytics sets cookies only after you accept in Privacy settings
- No email, phone number or name is ever sent to an analytics tool
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