#257D21

sRGB: 37 / 125 / 33

Distant whispers dance upon still waters
Hidden pathways illuminate forgotten empires
Distant echoes surrender to silence

#257D21 belongs to the green family. Its hex code tells a screen to mix 37 red, 125 green and 33 blue on a scale of 0 to 255. On the HSL wheel, hue is a position around a circle: 117.4° lands in the green region. Its 58.2% saturation makes it partway between gray and the most vivid version of this hue at this lightness. HSL lightness is 31.0% on a scale from black (0%) to white (100%). Of black and white lettering, white has the clearer light-to-dark separation on this background (5.21:1), which helps the shapes of letters stand out.

Color conversions

sRGB (8-bit): 37, 125, 33
HSL: 117.39°, 58.23%, 30.98%
HSV / HSB: 117.39°, 73.60%, 49.02%
CMYK (approx.): 70.40%, 0.00%, 73.60%, 50.98%
CIE XYZ (D65, Y = 100 for white): 8.371, 15.170, 3.926
CIELAB (D65, 2° observer): 45.866, -44.206, 40.598
WCAG relative luminance: 0.15170
24-bit decimal: 2456865

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 #257D21 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: 4.03:1

Normal text: Fail
Large text: AA

White text: 5.21:1

Normal text: AA
Large text: AAA

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.

Reference: 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

#79217D sits half a turn (180°) from #257D21 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.

#257D21 #79217D

Analogous

#537D21 and #217D4B sit 30° to either side of #257D21. 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.

#537D21 #257D21 #217D4B

Triadic

#257D21, #21257D and #7D2125 are spaced 120° apart, forming a triangle on the wheel. Try one for the main color and the other two for accents.

#257D21 #21257D #7D2125

Split complementary

Start at #257D21 and look across the wheel. #4B217D and #7D2153 sit 30° to either side of its exact opposite, giving you two different accent choices.

#257D21 #4B217D #7D2153

Square

Starting with #257D21, each quarter turn (90°) takes you to the next hue: #21537D, #79217D, then #7D4B21. Across the square, #257D21 pairs with #79217D, and #21537D with #7D4B21.

#257D21 #21537D #79217D #7D4B21

Tetradic

#257D21 and #79217D are opposites, as are #217D79 and #7D2125. Together they form a rectangle on the wheel, with alternating gaps of 60° and 120°.

#257D21 #217D79 #79217D #7D2125

Tints

Mixing #257D21 with white in 20% steps produces this scale. The first mixture, #51974D, keeps 80% of the original. By #D3E5D3, the mixture is 80% white.

#257D21 #51974D #7CB17A #A8CBA6 #D3E5D3 #FFFFFF

Shades

Mixing #257D21 with black in 20% steps produces this scale. The first mixture, #1E641A, keeps 80% of the original. By #071907, the mixture is 80% black.

#257D21 #1E641A #164B14 #0F320D #071907 #000000

Tones

Mixing #257D21 with middle gray in 20% steps produces this scale. The first mixture, #377E34, keeps 80% of the original. By #6E7F6D, the mixture is 80% middle gray.

#257D21 #377E34 #497E47 #5C7F5A #6E7F6D #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

#257D21

RGB

rgb(37 125 33)

HSL

hsl(117.391 58.228% 30.980%)

CSS example

.color-sample {
  background-color: #257D21;
  color: #FFFFFF;
}

Channel breakdown

RGB

#257D21 uses 37 red, 125 green and 33 blue. Each bar shows how much of that channel’s 0–255 range the screen uses.

Red 14.5%

Green 49.0%

Blue 12.9%

CMYK

A simple CMYK estimate for #257D21 is 70.4% cyan, 0.0% magenta, 73.6% yellow and 51.0% black. These are ink amounts; a printer profile is needed to predict the result on paper.

Cyan 70.4%

Magenta 0.0%

Yellow 73.6%

Black 51.0%

Nearby colors

The nearest shorthand match is #227722. Its matching digit pairs let you write it as #272 in CSS. For a modern design, keep #257D21 when you want an exact match. Use its web-safe neighbor, #336633, when matching a legacy palette of 216 colors.

Nearest shorthand: #227722 Nearest web-safe: #336633

Gradient to complement

#257D21 #336E30 #415E40 #4F4F4F #5D405E #6B306E #79217D

Color vision previews

Compare how #257D21 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.

#807112

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.

#766A2A

Tritanopia

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

#0F796B

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.

#6B741D

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.

#667127

Tritanomaly (50%)

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

#2B7B47

Grayscale (luminance)

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

#6D6D6D

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.

#527552

Reference: National Eye Institute: Types of Color Vision Deficiency

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 0.01850 G 0.20508 B 0.01521

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 0.25186 G 0.48327 B 0.18635

Linear Display P3

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

R 0.05163 G 0.19889 B 0.02901

CIE xyY

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

x 0.305 y 0.552 Y 15.170

CMY

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

C % 85.490 M % 50.980 Y % 87.059

Binary RGB

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

00100101 01111101 00100001