#645900
Closest named color: Olive Brown (#645403). oklch(46% 0.096 101), rgb(100, 89, 0).
Aa
White text reads best on this color (7.06:1).
About this color
#645900 is a medium-dark, moderately saturated brown. In OKLCH its lightness is 46%, its chroma 0.096 and its hue 101°. Its hue sits on the warm side of the wheel. The nearest named color is Olive Brown (#645403), ΔE 0.015 away. White text reads best on it, at 7.06:1.
| Hue family | Browns |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.096) |
| Temperature | warm |
| Nearest name | Olive Brown (#645403) |
| Black text | 2.97:1 |
| White text | 7.06:1 |
Values
| HEX | #645900 |
| RGB | rgb(100, 89, 0) |
| HSL | hsl(53, 100%, 20%) |
| OKLCH | oklch(46% 0.096 101) |
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 #645900 | 7.06:1 | AAA | Lc -89.3 | Fine for body text |
| Black text on #645900 | 2.97:1 | Fails | Lc 19.7 | Dividers and decoration only |
| #645900 text on white | 7.06:1 | AAA | Lc 84.3 | Fine for body text |
| #645900 text on black | 2.97:1 | Fails | Lc -17.6 | 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 700.
-
Step 50
50
#F6F6F1
oklch(97.2% 0.007 106.5)
-
Step 100
100
#EBEAE0
oklch(93.5% 0.013 102)
-
Step 200
200
#DCDAC7
oklch(88.5% 0.026 102)
-
Step 300
300
#C7C2A0
oklch(80.9% 0.046 100.4)
-
Step 400
400
#AAA26B
oklch(70.6% 0.075 101)
-
Step 500
500
#968B42
oklch(63.1% 0.095 100.9)
-
Step 600
600
#81751F
oklch(55.7% 0.104 101.1)
-
Step 700
700 (this color)
#645900
oklch(46% 0.096 101)
-
Step 800
800
#595012
oklch(42.8% 0.08 100.7)
-
Step 900
900
#494217
oklch(37.6% 0.062 100.1)
-
Step 950
950
#2B270F
oklch(27.1% 0.039 100)
#645900 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) | #635600 | 0.009 |
| Deuteranopia (no green cones) | #665A09 | 0.006 |
| Tritanopia (no blue cones) | #6D514B | 0.090 |
| Achromatopsia (no color) | #585858 | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #645900
#645900
oklch(46% 0.096 101)
- #4F508C
#4F508C
oklch(45.9% 0.096 281.2)
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 #645900, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Olive Brown #645403 ΔE 0.015
- Greeny Brown #696006 ΔE 0.023
- Mud #735C12 ΔE 0.031
- Mud Green #606602 ΔE 0.038
- Army Green #4B5D16 ΔE 0.038
- Camo Green #526525 ΔE 0.041
- Camouflage Green #4B6113 ΔE 0.042
- Green Brown #544E03 ΔE 0.045
Use #645900 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.