#A51000
Closest named color: Burnt Red (#9F2305). oklch(45.9% 0.181 30.6), rgb(165, 16, 0).
Aa
White text reads best on this color (7.85:1).
About this color
#A51000 is a medium-dark, vivid red. In OKLCH its lightness is 46%, its chroma 0.181 and its hue 31°. Its hue sits on the warm side of the wheel. The nearest named color is Burnt Red (#9F2305), ΔE 0.019 away. White text reads best on it, at 7.85:1.
| Hue family | Reds |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.181) |
| Temperature | warm |
| Nearest name | Burnt Red (#9F2305) |
| Black text | 2.67:1 |
| White text | 7.85:1 |
Values
| HEX | #A51000 |
| RGB | rgb(165, 16, 0) |
| HSL | hsl(6, 100%, 32%) |
| OKLCH | oklch(45.9% 0.181 30.6) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #A51000 | 7.85:1 | AAA | Lc -90.0 | Fine for body text |
| Black text on #A51000 | 2.67:1 | Fails | Lc 18.9 | Dividers and decoration only |
| #A51000 text on white | 7.85:1 | AAA | Lc 85.1 | Fine for body text |
| #A51000 text on black | 2.67:1 | Fails | Lc -16.9 | Dividers and decoration only |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 800.
-
Step 50
50
#FFF2F0
oklch(97.1% 0.014 28)
-
Step 100
100
#FEE3DE
oklch(93.6% 0.031 30.2)
-
Step 200
200
#FECCC2
oklch(88.6% 0.059 31.3)
-
Step 300
300
#FDA797
oklch(80.9% 0.105 31)
-
Step 400
400
#F8715D
oklch(70.7% 0.17 30.4)
-
Step 500
500
#F03F2A
oklch(63.1% 0.216 30.6)
-
Step 600
600
#D61800
oklch(55.7% 0.219 30.6)
-
Step 700
700
#B51300
oklch(49.2% 0.193 30.7)
-
Step 800
800 (this color)
#A51000
oklch(45.9% 0.181 30.6)
-
Step 900
900
#7B1206
oklch(37.6% 0.14 30.7)
-
Step 950
950
#490E07
oklch(27% 0.09 30.6)
#A51000 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #473D00 | 0.195 |
| Deuteranopia (no green cones) | #695D00 | 0.175 |
| Tritanopia (no blue cones) | #B70010 | 0.038 |
| Achromatopsia (no color) | #525252 | 0.182 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #A51000
#A51000
oklch(45.9% 0.181 30.6)
- #006371
#006371
oklch(45.8% 0.08 211.5)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #A51000, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Burnt Red #9F2305 ΔE 0.019
- Carmine #9D0216 ΔE 0.026
- Rufous #AE2012 ΔE 0.028
- Deep Red #9A0200 ΔE 0.028
- Rust Red #AA2704 ΔE 0.028
- Auburn #9B2226 ΔE 0.030
- Blood Red #980002 ΔE 0.033
- Brown #A52A2A ΔE 0.034
Use #A51000 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.