Sea Mariner (SW 9640)
Illustrative room. Screen colors vary; test a sample before you paint.
Sea Mariner (SW 9640) is a very deep, cool gray from Sherwin-Williams: LRV 7, so it reflects about 7 percent of the light that hits it.
Colors that go with Sea Mariner
Three Sherwin-Williams colors picked for Sea Mariner by this site's color math: a trim white, a quiet contrast from another family, a dark accent. Sherwin-Williams did not choose these pairings.
Closest match in every other brand
Each brand's closest color to Sea Mariner, ranked by CIEDE2000 (deltaE): under 1.0 is indistinguishable, 1.0 to 2.3 very close, 2.3 to 5 noticeably different, over 5 clearly different.
| Brand | Closest color | Code | LRV | deltaE | How close |
|---|---|---|---|---|---|
| Benjamin Moore | Hale Navy | HC-154 | 8.4 | 0.6 | indistinguishable |
| Behr | Secret Society | MQ5-10 | 7.5 | 1.6 | very close |
| Valspar | Royal Navy | 4011-4 | 7 | 0.9 | indistinguishable |
| PPG Paints | Cavalry | 1041-7 | 7 | 2.6 | noticeably different |
Lighter and darker in Sherwin-Williams
The Sherwin-Williams gray colors nearest to Sea Mariner (LRV 7) by LRV.
Lighter than Sea Mariner
Darker than Sea Mariner
Color data
| Brand | Sherwin-Williams |
|---|---|
| Color code | SW 9640 |
| Hex | #434A54 |
| RGB | 67, 74, 84 |
| HSL | 215°, 11%, 30% |
| LRV (light reflectance value) | 7 |
| Lab L*, a*, b* | 31.2, -0.4, -6.9 |
| Undertone | Cool |
| Temperature | cool |
| Color family | Gray |
Same paint, two kinds of light
Sea Mariner (SW 9640), published as #434A54
#324252
#535254
These swatches and the rooms above are a simulation, not a measurement. How the visualizer works
Similar shades from Sherwin-Williams
Comparisons that include Sea Mariner (SW 9640)
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Common questions
- What is the LRV of Sea Mariner (SW 9640)?
- Sea Mariner has an LRV of 7. LRV runs from 0 (black) to 100 (pure white) and measures the share of light a surface reflects, so Sea Mariner is a very deep color.
- What is the closest match to Sea Mariner in another brand?
- Hale Navy (BM HC-154) from Benjamin Moore, at a deltaE of 0.6 (indistinguishable).
- Is Sea Mariner warm or cool?
- Sherwin-Williams lists Sea Mariner as cool, with a Cool undertone. Its Lab b* value is -6.9; a higher b* is warmer and yellower, a lower one cooler and bluer.
Sources: LRV and hex as published by the manufacturer, via PaintDB (CC BY 4.0). Color differences are CIEDE2000 values computed by this site from the hex values (data snapshot 2026-10-01). Color names and codes belong to their manufacturers.