#B45737
Closest named color: Burnt Siena (#B75203). oklch(56.5% 0.13 39.3), rgb(180, 87, 55).
Aa
White text reads best on this color (4.81:1).
About this color
#B45737 is a medium-dark, moderately saturated red. In OKLCH its lightness is 57%, its chroma 0.130 and its hue 39°. Its hue sits on the warm side of the wheel. The nearest named color is Burnt Siena (#B75203), ΔE 0.031 away. White text reads best on it, at 4.81:1.
| Hue family | Reds |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.130) |
| Temperature | warm |
| Nearest name | Burnt Siena (#B75203) |
| Black text | 4.35:1 |
| White text | 4.81:1 |
Values
| HEX | #B45737 |
| RGB | rgb(180, 87, 55) |
| HSL | hsl(15, 53%, 46%) |
| OKLCH | oklch(56.5% 0.13 39.3) |
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 #B45737 | 4.81:1 | AA | Lc -78.3 | Fine for body text |
| Black text on #B45737 | 4.35:1 | AA large text | Lc 31.2 | Non-text elements, placeholder text |
| #B45737 text on white | 4.81:1 | AA | Lc 72.9 | Content text, not long reading |
| #B45737 text on black | 4.35:1 | AA large text | Lc -28.8 | 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 600.
-
Step 50
50
#FAF4F2
oklch(97.1% 0.007 39.5)
-
Step 100
100
#F5E6E2
oklch(93.6% 0.017 35.3)
-
Step 200
200
#EDD2CA
oklch(88.4% 0.032 37.1)
-
Step 300
300
#E3B5A5
oklch(81% 0.058 40.1)
-
Step 400
400
#D38C75
oklch(70.6% 0.093 38.7)
-
Step 500
500
#C66E51
oklch(63.1% 0.12 38.9)
-
Step 600
600 (this color)
#B45737
oklch(56.5% 0.13 39.3)
-
Step 700
700
#984427
oklch(49.1% 0.121 39.1)
-
Step 800
800
#7B3921
oklch(42.7% 0.099 40.1)
-
Step 900
900
#643120
oklch(37.7% 0.079 39)
-
Step 950
950
#3B1D14
oklch(27% 0.05 37.5)
#B45737 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) | #706534 | 0.125 |
| Deuteranopia (no green cones) | #877A35 | 0.115 |
| Tritanopia (no blue cones) | #C54450 | 0.063 |
| Achromatopsia (no color) | #727272 | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B45737
#B45737
oklch(56.5% 0.13 39.3)
- #00839F
#00839F
oklch(56.4% 0.103 219.8)
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 #B45737, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Burnt Siena #B75203 ΔE 0.031
- Burnt Orange #C04E01 ΔE 0.036
- Brick Orange #C14A09 ΔE 0.037
- Copper #B66325 ΔE 0.037
- Cinnamon #AC4F06 ΔE 0.038
- Rust Orange #C45508 ΔE 0.039
- Earth #A2653E ΔE 0.042
- Sienna #A0522D ΔE 0.043
Use #B45737 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.