12.2 m motor yacht by Sea Ray · built 2017–2026 (boats seen)
Sea Ray
SLX 400 OB used price guide
Middle half £318,000€372,500$425,000 – £491,500€569,000$663,500
median asking price of 30 boats listed since May 2025, in today's prices · asking, not sold
12.19 mbeam 3.68 mdraft 1.14 mfull specification
A used Sea Ray SLX 400 OB asks a median of £373,000€435,000$500,000 across 30 boats listed since May 2025, in today's prices. Half sit between £318,000€372,500$425,000 and £491,500€569,000$663,500, and each year of age takes about 9.4% off.
The field
Each number is one boat: its asking price in thousands of pounds, at today's market level, set above the year it was built. The orange line is the model's middle price for its age; the shaded band holds the middle half. Tap a number to see the boat behind it. The price scale is logarithmic: each step up is the same percentage.
Your boat
Estimated from the boats above. No email, no broker call.
Likely range £359,500€419,000$481,500 – £403,500€470,500$540,500
24 comparable boats built 2019–2025 · hours not given · all markets · asking, not sold
Add your asking price to see where it sits among boats like yours.
By year built
Median from five boats; middle half from ten. Below that we print nothing rather than a guess. Linked years have their own page with that year's boats. The spread is drawn on the field's logarithmic scale, in pounds.
| Year | Boats | Median | Middle half | Spread |
|---|---|---|---|---|
| 2026 | 2 | — | too few boats | |
| 2025 | 3 | — | too few boats | |
| 2024 | 2 | — | too few boats | |
| 2023 | 3 | — | too few boats | |
| 2022 | 3 | — | too few boats | |
| 2021 | 4 | — | too few boats | |
| 2020 | 4 | — | too few boats | |
| 2019 | 5 | £291,000€339,500$390,000 | too few boats | |
| 2018 | 1 | — | too few boats | |
| 2017 | 1 | — | too few boats |
Across boats built 2017 to 2026, each year of age takes about 9.4% off the asking price.
What moves the price
Each factor compares boats of the same age, so a newer boat's premium isn't counted twice. Five boats or more on each side, or we say so.
Each year of age takes about 9.4% off the asking price.
Too few boats to compare factors yet: we need five on each side of a split.
Asking prices, not sold. Factors can overlap, so treat these as a guide to what the market asks, not a formula.
Time to sell
listed so far: the median of 28 boats seen on two or more dates
have cut their asking price: 7 of 27 boats seen at least 14 days apart
median size of that cut, from the highest earlier ask
These are asking prices, and asking is not selling. Days listed so far is not time to sell: a boat still listed has not sold, and we do not yet record when a listing ends. We have not measured how far sale prices land below asking; the methodology says what we can and cannot measure.
Cost to keep
A year on a South Coast marina berth, insured at the Gauge Value, in pounds. An estimate from published rates, not a quote.
Fuel is not included: no cited source gives the engine hours a typical owner runs in a year.
Questions about the SLX 400 OB
How much is a used Sea Ray SLX 400 OB worth?
The median asking price is £373,000, from 30 boats listed since May 2025, in today's prices; half sit between £318,000 and £491,500. Each year of age takes about 9.4% off. For a specific boat, use Your boat above.
How long does a Sea Ray SLX 400 OB stay on the market?
We do not measure time to sell yet. Across 28 boats seen on two or more dates, the median time between first and last sighting is 36 days so far. 26% of 27 boats seen at least 14 days apart have cut their asking price, by a median of 17%.
How fast does a Sea Ray SLX 400 OB lose value?
About 9.4% of its asking price for each year of age, fitted on 28 boats built 2017 to 2026. On a boat at the median that is about £34,950 a year.
Are these sold prices?
No. They are asking prices observed on public listings, restated at today's market level. We have not yet measured how far sale prices land below asking, so we do not publish a figure for it.
About the SLX 400 OB
The boats behind this page were built between 2017 and 2026 and have been listed since May 2025, most often in the US market. 26% of the boats seen at least 14 days apart have cut their asking price.
How we measure: we read public listings from brokers and marketplaces, count a boat once when it appears on several sites, store its asking price each time it changes, and restate older asking prices at today's market level. We never republish a listing, a photograph or a seller. Every figure is recomputed nightly and dated; below five boats we publish nothing. The 30 boats here were listed in the US. Full methodology
- Length overall
- 12.19 mfrom listings · 28 boats
- Beam
- 3.68 mfrom listings · 22 boats
- Draft
- 1.14 mfrom listings · 10 boats
- Built
- 2017–2026from listings · 28 boats
- Type
- Motor yachtour classification