Forest Green (#228B22) is a medium, moderately saturated green hue. Forest green is a deep natural green that suits outdoor, camping and sustainability brands.
In RGB it is made of 34 red, 139 green and 34 blue. Its HSL hue angle is 120° with 61% saturation and 34% lightness, while its perceptual OKLCH lightness is 56% with a chroma of 0.169. For print, a starting CMYK mix is 76% cyan, 0% magenta, 76% yellow and 45% black.
As a text color on white, Forest Green has a contrast ratio of 4.39:1, which passes AA only for large text and UI parts. On black it reaches 4.78:1 and passes AA for normal text. If you use Forest Green as a background, put black (or very dark) text on it. The APCA lightness contrast is Lc 34 for black text and Lc -75 for white text.
Its perceptual complement is #A14AAC, close to plum. Colors that look most similar are green, sea green, olive. People with red-green color blindness see forest green quite differently (ΔE 12), so do not rely on it alone to signal meaning.