Inspect MediumTurquoise (#48D1CC) in HEX, RGB, HSL, LCH and OKLCH, check its contrast, and copy the value you need.
MediumTurquoise
#48D1CC
Black text reads best on this background, at 11.27:1.
MediumTurquoise is one of the 148 CSS named colors, and resolves to #48D1CC in every browser. In numbers that is rgb(72, 209, 204) and hsl(178, 60%, 55%). Perceptually it is a light, moderately saturated color: OKLCH puts its lightness at 79% and its chroma at 0.116. It sits in the cyans at 192 degrees of OKLCH hue, and reads as a cool color.
White text only reaches 1.86:1 here, so black text is the safer pairing at 11.27:1. That combination of lightness and chroma makes it a workable mid-tone, the kind of value that lands in the middle of a shade scale.
The closest CSS named colors to MediumTurquoise, measured with CIEDE2000, are DarkTurquoise (#00CED1), Turquoise (#40E0D0), LightSeaGreen (#20B2AA). If MediumTurquoise is not quite right, those are the nearest keywords to try before reaching for a custom value.
HEX
#48D1CC
RGB
rgb(72, 209, 204)
HSL
hsl(178, 60%, 55%)
HWB
hwb(178 28% 18%)
CMYK
cmyk(66%, 0%, 2%, 18%)
LAB
lab(76.56 -38.88 -8.97)
LCH
lch(76.56 39.9 192.99)
OKLCH
oklch(78.68% 0.1162 191.56)
WCAG asks for 4.5:1 between body text and its background. On #48D1CC white text measures 1.86:1 and black text 11.27:1, so black clears it and white does not.
White text on MediumTurquoise
WCAG 2.2
1.86:1
APCA
Lc 39
Fails AA body text
Fails AAA body text
Fails AA large text
Black text on MediumTurquoise
WCAG 2.2
11.27:1
APCA
Lc 69
Passes AA body text
Passes AAA body text
Passes AA large text
Check MediumTurquoise against any other color in the contrast checker.
MediumTurquoise sits at 79% OKLCH lightness. Holding its hue and chroma and moving only that value carries it up to #E4FFFD and down to #000807, which keeps the family recognizable instead of letting it drift toward gray the way a plain HSL ramp does.
#58DED9
20% lighter
#66EBE5
40% lighter
#74F8F2
60% lighter
#A3FFFA
80% lighter
#E4FFFD
100% lighter
#00A5A1
20% darker
#007976
40% darker
#004F4D
60% darker
#002928
80% darker
#000807
100% darker
Build a full accessible scale from #48D1CC in the shade generator.
Hues rotated around #48D1CC in OKLCH, then pulled back into the sRGB gamut. Each swatch is labelled with the nearest CSS named color so you have a keyword to start from.
MediumTurquoise sits at 192 degrees. Rotating it a half turn lands on 12 degrees, the hue directly opposite. It is the strongest pairing you can make without changing lightness, and the one most likely to vibrate if you use both at full chroma.
The neighbors of MediumTurquoise at 162 and 222 degrees. They stay close enough to read as the same family, which is what you want for hover states, secondary surfaces and gradients.
192, 312 and 72 degrees divide the wheel into thirds. Balanced enough to carry a whole palette without one color dominating the other two.
Instead of the complement at 12 degrees, this pair flanks it at 342 and 42. You keep most of the contrast of a complementary pairing while losing the harshness.
Explore more combinations around MediumTurquoise on the color wheel.
The biggest shift is under deuteranopia, where #48D1CC reads as #A0AACE, 26.7 CIEDE2000 units away. If MediumTurquoise is the only thing marking a state or a series, roughly one viewer in twelve will miss it.
Protanopia
#BDC1CC
Deuteranopia
#A0AACE
Tritanopia
#26DBCF
Achromatopsia
#B3B4B4
The nearest CSS keywords to #48D1CC, ranked by perceptual distance rather than by how close their hex digits happen to look.