Diener's SWLS
Life Satisfaction
Five statements, two minutes. Short, but one of the most-cited scales in positive psychology.
SWLS doesn't measure mood or happiness. It measures how you rate your life as a whole, in your own terms, not against anyone else. The scale was published in 1985 and has been used in thousands of studies. It's simple but honest: it gives you a number and a general context, not a diagnosis.
BeginSWLS - Satisfaction with Life Scale, Ed Diener et al., 1985. It's a self-report on subjective satisfaction, not a diagnosis of depression or any other condition. Your result can shift with the season of your life, and that's normal.