A full-time stay-at-home mother would earn $134,121 a year if paid for all her work, an amount similar to a top U.S. ad executive, a marketing director or a judge, according to a study released on Wednesday.

A mother who works outside the home would earn an extra $85,876 annually on top of her actual wages for the work she does at home, according to the study by Waltham, Massachusetts-based compensation experts Salary.com.

To reach the projected pay figures, the survey calculated the earning power of the 10 jobs respondents said most closely comprise a mother's role -- housekeeper, day-care teacher, cook, computer operator, laundry machine operator, janitor, facilities manager, van driver, chief executive and psychologist.

"You can't put a dollar value on it. It's worth a lot more," said Kristen Krauss, 35, as she hurriedly packed her four children, all aged under 8, into a minivan in New York while searching frantically for her keys. "Just look at me."