Because there's constantly an argument of what track is at what Altitude here's a calculator to give you real time numbers:

Example:

California Speedway (Fontana CA)

Base Altitude: 1100
Current Ait Temperature: 80 degrees F
Current Altimeter Setting: 29.21 inches Hg
Current Dew Point: 37 degrees F

Real Time Density Altitude: 3605 feet

http://wahiduddin.net/calc/calc_da.htm

take my 12.125 run at 3605 feet and convert it via the NHRA Conversion chart
and that run: 12.125 X .9562 = 11.593 at sea level

http://www.kallistimotorsports.com/t...artermile.html

Maybe the moderator can make this a sticky to help others calculate their local tracks and times