Turquoise

#40E0D0

Named via French for 'Turkish stone' — the gemstone reached medieval Europe along trade routes that passed through Turkey, even though the mineral itself was mined further east, in Persia and the Sinai Peninsula, making the name a trade-route reference rather than a mining-origin one.

Every value on this page is computed at build time from the hex code above using ChromaWell's shared, unit-tested color-core library — the same conversion, contrast, and nearest-name math used across every color page on this site, so a value here matches the same color looked up anywhere else on ChromaWell.

The conversions block gives you the same color in seven common formats (hex, RGB, HSL, HSV, CMYK, Lab, and OKLCH) so you can copy whichever your codebase or design tool expects. The contrast block applies the WCAG 2.x relative-luminance formula against several common backgrounds and reports whether text in this color would pass AA or AAA at normal and large text sizes. Shades/tints step the lightness up and down at a fixed hue and saturation; harmonies rotate the hue around the color wheel to surface complementary, analogous, triadic, and split-complementary partners; and nearest named colors ranks the closest matches from our full 1,094-color dataset by CIE76 Delta-E distance in Lab space, a perceptual distance metric rather than a raw RGB difference.

Conversions

HEX: #40E0D0
RGB: rgb(64, 224, 208)
HSL: hsl(174, 72.1%, 56.5%)
HSV: hsv(174, 71.4%, 87.8%)
CMYK: cmyk(71.4, 0, 7.1, 12.2)
Lab: lab(81.26, -44.08, -4.03)
OKLCH: oklch(0.8223 0.1307 185.1)

WCAG contrast

On white: 1.64:1 — normal text FAIL, large text FAIL
On black: 12.79:1 — normal text AAA, large text AAA
On pure white: 1.64:1 — normal text FAIL, large text FAIL
On pure black: 12.79:1 — normal text AAA, large text AAA
On light gray (#F3F4F6): 1.49:1 — normal text FAIL, large text FAIL
On dark slate (#1F2937): 8.94:1 — normal text AAA, large text AAA

Ratios computed from WCAG 2.x relative luminance; AA needs 4.5:1 for normal text and 3:1 for large text (18pt+ or 14pt+ bold), AAA needs 7:1 and 4.5:1 respectively.

Shades & tints

#13746B

#1EB6A7

#40E0D0

#82EBE0

#C4F5F0

Lightness stepped ±15% and ±30% in HSL space at constant hue and saturation (174°, 72.1%) — a shade darkens toward black, a tint lightens toward white.

Color harmonies

Hue-wheel relationships computed at this color's exact hue (174°), holding saturation and lightness constant.

Complementary

#E04050

rgb(224, 64, 80)

Analogous −30°

#40E080

rgb(64, 224, 128)

Analogous +30°

#40A0E0

rgb(64, 160, 224)

Triadic 120°

#D040E0

rgb(208, 64, 224)

Triadic 240°

#E0D040

rgb(224, 208, 64)

Split-complementary −150°

#E08040

rgb(224, 128, 64)

Split-complementary +150°

#E040A0

rgb(224, 64, 160)

Nearest named colors

Turquoise (ΔE 0.0)
MediumTurquoise (ΔE 9.1)
DarkTurquoise (ΔE 11.9)
Aqua (ΔE 14.7)
Cyan (ΔE 14.7)

Ranked by CIE76 Delta-E distance in Lab space — the lower the number, the closer the perceptual match to this exact color.

Perceptual profile

Hue 174° places this color in the cool range of the wheel. At 72.1% saturation it reads as moderately saturated, and at 56.5% lightness it sits at mid-tone. In OKLCH — the newer, perceptually uniform color space — this color's lightness is 0.8223, chroma 0.1307, hue 185.1°, which is a more accurate predictor of how "bright" this color will look next to others than HSL lightness alone.

Use in CSS

This is a cool hue at 72.1% saturation and 56.5% lightness. Drop it into a stylesheet as a custom property:

:root {
  --color-40e0d0: #40E0D0;
}
.el {
  color: var(--color-40e0d0);
}

Part of the open CSS/X11 named-color set — see methodology.