BLUES

Ultramarine Blue

#657ABB

RGB 101, 122, 187 · HSL 225°, 39%, 56% · CMYK 46, 35, 0, 27

Ultramarine Blue is #657ABB in HEX — rgb(101, 122, 187), hsl(225°, 39%, 56%), cmyk(46%, 35%, 0%, 27%).

Ultramarine Blue pulls into the mid-tone end of the blues spectrum — HSL 225°, 39%, 56%. The muted saturation makes it quiet but present, and the hue reads cool. In interior projects it shines on bedrooms, bathrooms, home offices — for calm, focused environments. Reads best alongside warm white trim, oak or walnut, brass or matte black hardware.

Color Codes

HEX#657ABB

RGB101, 122, 187

HSL225°, 39%, 56%

HSV225°, 46%, 73%

CMYK46, 35, 0, 27

Decimal6650555

CSS RGBrgb(101, 122, 187)

CSS HSLhsl(225, 39%, 56%)

Paint Matches — this color across 16 brands

Behr

Royal Fortune S560-5

ΔE 1.6 · #6276B6

Hallman-Lindsay

Wind Star 1270

ΔE 2.9 · #6875B7

Vista Paint

Purple Wave K-73

ΔE 4 · #6A74B7

Dunn-Edwards

Bodega Bay DE5893

ΔE 4.5 · #5E81C1

Benjamin Moore

Waterdrop CC-902

ΔE 5 · #5D7AB4

Dulux

Prefect S41H6

ΔE 5.1 · #5775B0

PPG

Cenote 17-02

ΔE 5.2 · #5072B1

Valspar

Dazzle 4005-10C

ΔE 6 · #556DA9

IKEA

IKEA128 128

ΔE 6.6 · #4A72B0

Kilz

Genie RB120-01

ΔE 8.1 · #6877AA

Sherwin-Williams

Gentian SW6817

ΔE 8.5 · #6572A5

Kobra

Violet 25

ΔE 10.9 · #776BAB

RAL

Sky Blue 5015

ΔE 12.3 · #2271B3

Dutch Boy

Blue Sea VS-9451

ΔE 14.1 · #2D61AD

Farrow & Ball

Pitch Blue 220

ΔE 19 · #636E8F

Colorhouse

Petal .05 Petal-05

ΔE 21.7 · #1F4992

Light Reflectance & Undertone

Light Reflectance Value (LRV)

20/100

Dark

0 · DarkLight · 100

Soaks up light and feels moody and intimate. Great for studies, dining rooms and accent walls; pair with ample lighting.

Undertone

TemperatureCool MasstoneBlue UndertoneViolet

Reads as a cool blue with a violet undertone showing through, especially in daylight. Pair trim and adjacent colours to either calm or amplify that undertone.

Color Theory

Complementary

#657ABB

#BBA563

Analogous

#63A5BB

#657ABB

#7963BB

Triadic

#657ABB

#BB6379

#79BB63

Split-Complementary

#657ABB

#BB7963

#A5BB63

Tetradic

#657ABB

#BB63A5

#BBA563

#63BB79

Monochromatic

#28355C

#405491

#657ABB

#98A7D2

#CDD4E9

Rectangle

#657ABB

#A563BB

#BBA563

#79BB63

Compound

#657ABB

#7963BB

#BBA563

#A5BB63

Variations

Lighter

#8294C8

#A5B1D2

#CDD2E2

Darker

#435BA1

#2D3E70

#192342

Saturation

#82889C

#6379BB

#4168DD

Interior Use

Best Rooms

bedrooms, bathrooms, home offices

Best Uses

main walls, ceilings, trim, cabinetry

Pairs With

warm white trim, oak or walnut, brass or matte black hardware

Accessibility (WCAG)

vs White

4.15:1

AA Large

vs Black

5.05:1

Deuteranopia

#657ABB

#627CBC

Original → Simulated

Protanopia

#657ABB

#7777B4

Original → Simulated

Tritanopia

#657ABB

#5C877E

Original → Simulated

Color Psychology

Focused · Cooling

Ultramarine Blue lowers the temperature of a room — useful in south-facing rooms that overheat visually, and in home offices where you want a clear head. Pair with warm wood and brass to keep it from reading clinical.

SymbolismTrust, depth, stability

PersonalityClear-headed, dependable, contemplative

focustrustcalmofficebedroomdepth

How it looks under different light

#8B88A7

Warm Bulb 2700K

Incandescent / soft white LED — pulls colour toward yellow/amber.

#657ABB

Daylight 5500K

Midday natural light or daylight-spec LED — closest to the paint chip.

#788DCC

Cool Bulb 6500K

Cool white LED / overcast daylight — pulls colour toward blue.

Pairs With

#E9EAEC

Trim

Matched off-white

Same hue at 92% lightness — trim reads coordinated, not stark.

#F7F7F8

Ceiling

Whisper tint

Near-white with a hint of the hero's undertone — ceiling feels intentional.

#A28D51

Accent

Complementary punch

Hue +180°, slightly muted for paint vs. screen — use on a door, frame, or single piece.

#574738

Floor

Walnut neutral

Warm mid-brown grounds the scheme regardless of hero hue.

Paint Info

Brand · Product Line

Benjamin Moore / Regal Select Interior

Recommended Finishes

Eggshell (walls) · Pearl (trim) · Matte (ceiling)

Eggshell hides imperfections on main walls while keeping the color rich; pearl on trim adds subtle sheen and easier cleaning; flat matte on ceilings prevents glare.

Best Surfaces

Primary walls · Cabinetry · Trim · Soft furniture

Coverage & Dry Time

Typical coverage 350-400 sq ft per gallon over a primed surface.

Touch-dry in ~1 hour. Recoat after 4 hours. Full cure 7-14 days.

Primer

Standard primer is adequate.

Application Tip

Use a 9" microfiber roller on walls and a 2.5" angled sash brush for trim cuts. Two coats minimum for even depth.

Paint Calculator

Wall area (m²)

Coats

Coverage (m² / L)

You'll need

4.0 litres

1.06 US gallons · room for one touch-up coat. Buy slightly more to ensure single-batch match.

Code Snippets

CSS — color

color: #657ABB;

CSS — background

background-color: #657ABB;

CSS Variable

--color-ultramarine-blue: #657ABB;

Tailwind v3 — config

colors: { 'ultramarine-blue': '#657ABB' }

Tailwind — arbitrary

bg-[#657ABB] text-[#657ABB]

SCSS

$ultramarine-blue: #657ABB;

Similar Colors

Waterdrop

#5C79B3 · ΔE 5.0

Watertown

#5B7EB7 · ΔE 6.7

California Lilac

#7F84BE · ΔE 7.6

Blue Lapis

#6289C6 · ΔE 7.8

Athens Blue

#3D74AC · ΔE 11.2

Mosaic

#3862A3 · ΔE 11.4

Brazilian Blue

#6E94CC · ΔE 12.2

Softened Violet

#8085B4 · ΔE 12.2

Built by DSGN.HOUSE Updated 2026

Our color tools run on our own catalogue of 26,000+ real paint colors across 16 brands — Benjamin Moore, Sherwin-Williams, Behr, Dulux, RAL and more — with the color math (HSL and CIELAB matching) computed in-house, not scraped from summaries. Every color you pick maps to a real, buyable paint with its code, so what you see here you can actually take to the store. We review and update these tools and their data regularly.

Created by Denis Kataev, founder of DSGN.HOUSE — a software engineer and digital entrepreneur building professional color-design tools for everyone.

Frequently Asked Questions

What color is #657ABB?

#657ABB is Ultramarine Blue, a mid-tone blue with a cool undertone.

Is #657ABB warm or cool?

Ultramarine Blue reads cool, which influences how it interacts with surrounding tones and natural light.

What rooms work best with Ultramarine Blue?

Ultramarine Blue works well in bedrooms, bathrooms, home offices. Designers typically use it for main walls, ceilings, trim, cabinetry.

What colors pair well with Ultramarine Blue?

Ultramarine Blue pairs naturally with warm white trim, oak or walnut, brass or matte black hardware. Its complementary color is also a strong contrast option for accents.

Where can I download Ultramarine Blue?

You can download Ultramarine Blue on DSGN.HOUSE in 15 designer formats including CSS gradient, Figma, Procreate swatches, Tailwind config, Adobe ASE, SVG, and 4K wallpapers — all free.

What's the hex code for Ultramarine Blue?

The hex code is #657ABB. In RGB it's 101, 122, 187, and in HSL it's 225°, 39%, 56%.

← All colors