Calculate ERA for 2 1/3 Innings Pitched

What's the Earned Run Average (ERA) of a pitcher who throws 2 and 1/3rd innings? Just enter the runs allowed and hit the calculate button.
Innings
Runs
ERA is the number of earned runs allowed per nine innings pitched.
If a pitcher allows 0 runs in 2 1/3 innings:
ERA = 0.00
ERA for 2 1/3 Innings Pitched
Based on runs allowed
Earned Runs ERA
1 3.86
2 7.71