That’s nearly an extra three months of work, and translates to $13,570 less per year, according to the National Women’s Law Center. The wage gap widens for mothers and women of color….The wage gap is calculated by comparing the median earnings for all women working full-time year-round compared to that of all men working full-time year-round, says Vasu Reddy, director of state policy for workplace justice at the National Women’s Law Center. “Even if you compare just within jobs or within education level, you still see gaps. It’s estimated that at least one third of the wage gap is unaccounted for by other factors. Therefore, we can assume it’s down to discrimination.”

The fact that women are overrepresented in the lowest-paying jobs and men are more concentrated in the highest-paying jobs also pushes the median wages down for women. “And because we have stagnating wage growth, especially at the lower levels of earnings, that gap just continues to widen,” says Reddy.