Dudes, I have some bad news for you. You haven't spent enough on your wife or girlfriend's Christmas presents. You will have to go back to the mall. Here's why.

According to a new survey, the average woman is expecting $480 worth of presents this year. And that's just the average! If you want to figure out exactly what your wife or girlfriend is expecting, the people running the survey came up with a rough formula you can use to figure out exactly what her expectations are. It's about 1% of your annual salary. So if you make $60,000 a year, she's probably expecting $600 in gifts. If you make $100,000, she's expecting $1,000.

Men's expectations are a little bit lower. The average man expects presents that cost about $320 total.

To figure out your husband or boyfriend's expectations, the rough formula for what men expect is 0.7% of your annual salary. So if you make $60,000, he's expecting about $420 in presents.