Watertown (BM 818)
Illustrative room. Screen colors vary; test a sample before you paint.
Watertown (BM 818) is a deep, cool blue from Benjamin Moore: LRV 22.6, so it reflects about 23 percent of the light that hits it.
Colors that go with Watertown
Four Benjamin Moore colors picked for Watertown by this site's color math: a trim white, a deeper blue, a quiet contrast from another family, a dark accent. Benjamin Moore did not choose these pairings.
Closest match in every other brand
Each brand's closest color to Watertown, 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 |
|---|---|---|---|---|---|
| Sherwin-Williams | Perfect Periwinkle | SW 9065 | 23 | 3.8 | noticeably different |
| Behr | Blue Iolite | MQ4-25 | 20.7 | 1.0 | indistinguishable |
| Valspar | Wellspring | 4007-8B | 22 | 3.0 | noticeably different |
| PPG Paints | Shrinking Violet | 1162-5 | 22 | 2.8 | noticeably different |
Lighter and darker in Benjamin Moore
The Benjamin Moore blue colors nearest to Watertown (LRV 22.6) by LRV.
Lighter than Watertown
Darker than Watertown
Color data
| Brand | Benjamin Moore |
|---|---|
| Color code | 818 |
| Hex | #5B7EB7 |
| RGB | 91, 126, 183 |
| HSL | 217°, 39%, 54% |
| LRV (light reflectance value) | 22.6 |
| Lab L*, a*, b* | 52.5, 3.9, -33.8 |
| Undertone | Cool Blue |
| Temperature | cool |
| Color family | Blue |
Same paint, two kinds of light
Watertown (BM 818), published as #5B7EB7
#4175B5
#7287B8
These swatches and the rooms above are a simulation, not a measurement. How the visualizer works
Similar shades from Benjamin Moore
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Common questions
- What is the LRV of Watertown (BM 818)?
- Watertown has an LRV of 22.6. LRV runs from 0 (black) to 100 (pure white) and measures the share of light a surface reflects, so Watertown is a deep color.
- What is the closest match to Watertown in another brand?
- Blue Iolite (Behr MQ4-25) from Behr, at a deltaE of 1.0 (indistinguishable).
- Is Watertown warm or cool?
- Benjamin Moore lists Watertown as cool, with a Cool Blue undertone. Its Lab b* value is -33.8; 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.