Most likely you're trying to compare FTP (functional threshold power). To determine FTP, you'd perform a 20-minute TT effort (preferably doing this more than once with a full recovery between efforts, then taking the average of the efforts) Your FTP is 95% of your 20-minute power. Then you can just calculate your power-to-weight ratio. You can also test the other durations to compare your strengths or model your potential (ie are you a time trialist, a sprinter, an all-arounder, a fatt-butt, etc).

I don't encourage folks to compare themselves to anyone else. However, that's the purpose of this chart.