All birds are different & have a different life expectancy. To answer this question we would need the average age your bird will live to and the life expectancy of a human (around 80). We take life expectancy of humans and divide by the bird's life expectancy. So for example, the budgie's life expectancy is about 7 years. So dividing 80 by 7 gives us about 11 years. Birds do not experience 11 years in one of our years. They see one year as one year based on seasonal changes. The concept of bird years is just something made up by people to make them feel that their pets are living a full life.

It depends on the bird and its age. You're probably looking for a simple answer, but there isn't any simple correct answer.

Some of the longest lived birds such as large parrots or albatrosses may live as long as people (at least in captivity - in the wild they tend to get eaten when they get older and slower). You might therefore think one human year would be equivalent to one macaw year, but it's not that simple. A macaw grows to full size in less than a year, but isn't fully sexually mature until three or four years. That doesn't correspond to humans at all - we tend to reach full size and sexual maturity about the same time. Still, a macaw's first four years are each equivalent to perhaps 5 human years. After that, a year for them is like a year for us.

On the other hand, your common wrens, hummingbirds, or warblers live for only maybe 5 years. Each year of their life would be like 15 of ours.

Ducks, geese, hawks and eagles can live over 20 years in the wild, so they're somewhere in between. Their first two years might be like 7-8 human years. After that, each year for them might be like two for us.