#E04310

sRGB · 224 / 67 / 16

#E04310 belongs to the red family. Its hex code tells a screen to mix 224 red, 67 green and 16 blue on a scale of 0 to 255. On the HSL wheel, hue is a position around a circle: 14.7° lands in the red region. Its 86.7% saturation makes it strong in color at this lightness. HSL lightness is 47.1% on a scale from black (0%) to white (100%). Of black and white lettering, black has the clearer light-to-dark separation on this background (4.98:1), which helps the shapes of letters stand out.

Color conversions

sRGB (8-bit): 224, 67, 16
HSL: 14.71°, 86.67%, 47.06%
HSV / HSB: 14.71°, 92.86%, 87.84%
CMYK (approx.): 0.00%, 70.09%, 92.86%, 12.16%
CIE XYZ (D65, Y = 100 for white): 32.840, 19.902, 2.602
CIELAB (D65, 2° observer): 51.726, 58.934, 59.162
WCAG relative luminance: 0.19899
24-bit decimal: 14697232

CMYK uses a profile-free approximation. Printed output depends on the press, ink and paper. Lab uses a D65 white point.

Text contrast

Contrast tells you how clearly lettering separates from #E04310 in light and dark. The ratio compares relative luminance, a measure of light weighted for human vision. Identical colors give 1:1 and black against white gives 21:1. A ratio of 2.99:1 falls just below the 3:1 AA minimum for large text. Body text needs at least 4.5:1 because its finer strokes are harder to distinguish.

Black text · 4.98:1

Normal text: AA
Large text: AAA

White text · 4.22:1

Normal text: Fail
Large text: AA

AA and AAA are WCAG accessibility levels. AAA sets a higher bar: 7:1 for normal text and 4.5:1 for large text. Large text begins at 18 pt regular or 14 pt bold. Ratings use the unrounded ratio. WCAG text contrast guidance

Palettes & scales

Harmonies rotate the hue. Scales mix the starting color with white, black or middle gray in 20% steps in encoded sRGB.

Complementary

#10ADE0 sits half a turn (180°) from #E04310 on the HSL wheel. Keeping saturation and lightness steady while crossing to the opposite hue gives you a contrasting accent. Check text contrast separately before using the pair for lettering.

#E04310 #10ADE0

Analogous

#E01045 and #E0AB10 sit 30° to either side of #E04310. The three hues are neighbors on the wheel, so you can change the color of a border or highlight while keeping it close to the original.

#E01045 #E04310 #E0AB10

Triadic

#E04310, #10E043 and #4310E0 are spaced 120° apart, forming a triangle on the wheel. Try one for the main color and the other two for accents.

#E04310 #10E043 #4310E0

Split complementary

Start at #E04310 and look across the wheel. #10E0AB and #1045E0 sit 30° to either side of its exact opposite, giving you two different accent choices.

#E04310 #10E0AB #1045E0

Square

Starting with #E04310, each quarter turn (90°) takes you to the next hue: #45E010, #10ADE0, then #AB10E0. Across the square, #E04310 pairs with #10ADE0, and #45E010 with #AB10E0.

#E04310 #45E010 #10ADE0 #AB10E0

Tetradic

#E04310 and #10ADE0 are opposites, as are #ADE010 and #4310E0. Together they form a rectangle on the wheel, with alternating gaps of 60° and 120°.

#E04310 #ADE010 #10ADE0 #4310E0

Tints

Mixing #E04310 with white in 20% steps produces this scale. The first mixture, #E66940, keeps 80% of the original. By #F9D9CF, the mixture is 80% white.

#E04310 #E66940 #EC8E70 #F3B49F #F9D9CF #FFFFFF

Shades

Mixing #E04310 with black in 20% steps produces this scale. The first mixture, #B3360D, keeps 80% of the original. By #2D0D03, the mixture is 80% black.

#E04310 #B3360D #86280A #5A1B06 #2D0D03 #000000

Tones

Mixing #E04310 with middle gray in 20% steps produces this scale. The first mixture, #CD4F26, keeps 80% of the original. By #93746A, the mixture is 80% middle gray.

#E04310 #CD4F26 #BA5B3D #A66853 #93746A #808080

Copy color codes

Hex, RGB and HSL are three ways to write this screen color. Paste any of them into a CSS color property.

Hex

#E04310

RGB

rgb(224 67 16)

HSL

hsl(14.712 86.667% 47.059%)

CSS example

.color-sample {
  background-color: #E04310;
  color: #000000;
}

Channel breakdown

RGB

#E04310 uses 224 red, 67 green and 16 blue. Each bar shows how much of that channel’s 0–255 range the screen uses.

Red 87.8%

Green 26.3%

Blue 6.3%

CMYK

A simple CMYK estimate for #E04310 is 0.0% cyan, 70.1% magenta, 92.9% yellow and 12.2% black. These are ink amounts; a printer profile is needed to predict the result on paper.

Cyan 0.0%

Magenta 70.1%

Yellow 92.9%

Black 12.2%

Nearby colors

The nearest shorthand match is #DD4411. Its matching digit pairs let you write it as #D41 in CSS. For a modern design, keep #E04310 when you want an exact match. Use its web-safe neighbor, #CC3300, when matching a legacy palette of 216 colors.

Nearest shorthand · #DD4411 Nearest web-safe · #CC3300

Gradient to complement

#E04310 #BD5533 #9B6655 #787878 #558A9B #339BBD #10ADE0

Color vision previews

Compare how #E04310 appears in each simulation. When two chart lines or status indicators become hard to tell apart, a label, shape or line pattern gives readers another way to distinguish them. Individual perception varies.

Protanopia

A red–green color vision deficiency. Without a distinct response from long-wavelength cones, some reds and greens can look alike, and reds can appear darker.

#736500

Deuteranopia

A red–green color vision deficiency. Without a distinct response from medium-wavelength cones, some greens can be difficult to distinguish from reds or browns.

#9A8800

Tritanopia

A blue–yellow color vision deficiency. Without a distinct response from short-wavelength cones, blue can resemble green, and yellow can resemble pink.

#F7003B

Protanomaly (50%)

An altered long-wavelength cone response can make reds appear dimmer and harder to distinguish from greens. This swatch shows the model’s halfway setting.

#A66000

Deuteranomaly (50%)

An altered medium-wavelength cone response can reduce the visible difference between reds and greens. This swatch shows the model’s halfway setting.

#B17500

Tritanomaly (50%)

An altered short-wavelength cone response can make blue harder to distinguish from green. This swatch shows the model’s halfway setting.

#E23F29

Grayscale (luminance)

This design check removes hue and preserves relative luminance so you can compare light and dark areas.

#7B7B7B

Partial grayscale (50% blend)

This design check mixes the original color halfway toward its grayscale equivalent in linear light. Use it to see how a design holds up as color fades.

#B7645A

Technical reference

CAM16 and CIECAM02 below assume D65 white, an average surround, background Y of 20 against white at 100, and adapting luminance of 4.07 cd/m².

Linear sRGB

These channels scale with emitted light. Use them for lighting calculations and physically meaningful blends.

R 0.74540 G 0.05613 B 0.00518

Display P3

P3 displays can reproduce a wider range of reds and greens. These coordinates reproduce this same sRGB swatch on a color-managed P3 display.

R 0.81123 G 0.31140 B 0.15809

Linear Display P3

These P3 channels are proportional to light, before display encoding.

R 0.62303 G 0.07901 B 0.02151

CIE xyY

The x and y coordinates locate chromaticity on a diagram. Y gives relative luminance on a scale where white is 100.

x 0.593 y 0.360 Y 19.902

CMY

Ideal cyan, magenta and yellow are the complements of the encoded red, green and blue channels.

C % 12.157 M % 73.725 Y % 93.725

Binary RGB

Each eight-bit group represents one channel. Together they store the 24-bit hex color.

11100000 01000011 00010000