Not only do women earn less for similar work, they also do more work for no pay at all.
Here’s a look at how much more unpaid work women do than men, around the developed world:
Source: Organization for Economic Cooperation and Development, national time use surveys.
The chart is from an Organization for Economic Cooperation and Development working paper titled “Cooking, Caring and Volunteering: Unpaid Work Around the World.” As you can see, in every country for which the organization had data, women spent much more time than men on unpaid work like child care and household chores like cooking and cleaning. Across the O.E.C.D., the average gap between time spent by women and by men on unpaid work is about two and a half hours.
On child care in particular, mothers spend more than twice as much time per day as fathers do: 1 hour 40 minutes for mothers, on average, compared to 42 minutes for fathers.
The numbers vary, of course, depending on whether each parent also has a paid job, but perhaps not by as much as you’d think, especially for the men. On average, working fathers spend only 10 minutes more per day on child care when they are not working, whereas working mothers spend nearly twice as much time (144 minutes vs. 74) when not working.