Inspect OrangeRed (#FF4500) in HEX, RGB, HSL, LCH and OKLCH, check its contrast, and copy the value you need.
OrangeRed
#FF4500
Black text reads best on this background, at 6.1:1.
OrangeRed is one of the 148 CSS named colors, and resolves to #FF4500 in every browser. In numbers that is rgb(255, 69, 0) and hsl(16, 100%, 50%). Perceptually it is a mid-toned, vivid color: OKLCH puts its lightness at 66% and its chroma at 0.229. It sits in the oranges at 35 degrees of OKLCH hue, and reads as a warm color.
White text only reaches 3.44:1 here, so black text is the safer pairing at 6.1:1. At this chroma it is loud enough to be an accent or a call to action, but it will fight anything else vivid placed next to it.
The closest CSS named colors to OrangeRed, measured with CIEDE2000, are Red (#FF0000), Tomato (#FF6347), Coral (#FF7F50). If OrangeRed is not quite right, those are the nearest keywords to try before reaching for a custom value.
HEX
#FF4500
RGB
rgb(255, 69, 0)
HSL
hsl(16, 100%, 50%)
HWB
hwb(16 0% 0%)
CMYK
cmyk(0%, 73%, 100%, 0%)
LAB
lab(58.52 69.17 70.9)
LCH
lch(58.52 99.05 45.71)
OKLCH
oklch(66.02% 0.2294 35.4)
WCAG asks for 4.5:1 between body text and its background. On #FF4500 white text measures 3.44:1 and black text 6.1:1, so black clears it and white does not.
White text on OrangeRed
WCAG 2.2
3.44:1
APCA
Lc 65
Fails AA body text
Fails AAA body text
Passes AA large text
Black text on OrangeRed
WCAG 2.2
6.1:1
APCA
Lc 43
Passes AA body text
Fails AAA body text
Passes AA large text
Check OrangeRed against any other color in the contrast checker.
OrangeRed sits at 66% OKLCH lightness. Holding its hue and chroma and moving only that value carries it up to #FFF6F4 and down to #120100, which keeps the family recognizable instead of letting it drift toward gray the way a plain HSL ramp does.
#FF7754
20% lighter
#FF9C82
40% lighter
#FFBCAA
60% lighter
#FFDAD0
80% lighter
#FFF6F4
100% lighter
#C93400
20% darker
#962500
40% darker
#661600
60% darker
#390800
80% darker
#120100
100% darker
Build a full accessible scale from #FF4500 in the shade generator.
Hues rotated around #FF4500 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.
OrangeRed sits at 35 degrees. Rotating it a half turn lands on 215 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 OrangeRed at 5 and 65 degrees. They stay close enough to read as the same family, which is what you want for hover states, secondary surfaces and gradients.
35, 155 and 275 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 215 degrees, this pair flanks it at 185 and 245. You keep most of the contrast of a complementary pairing while losing the harshness.
Explore more combinations around OrangeRed on the color wheel.
The biggest shift is under protanopia, where #FF4500 reads as #6F5300, 35.7 CIEDE2000 units away. If OrangeRed is the only thing marking a state or a series, roughly one viewer in twelve will miss it.
Protanopia
#6F5300
Deuteranopia
#997600
Tritanopia
#FF2C31
Achromatopsia
#686867
The nearest CSS keywords to #FF4500, ranked by perceptual distance rather than by how close their hex digits happen to look.