If you have an accurate meat thermometer these are the recommended internal temperatures for steak.

Steak Internal Temperature
Rare
120 to 129 degrees
Medium Rare
130 to 144 degrees
Medium
145 to 154 degrees
Ruined
155 degrees or higher

The following cooking times were taken from a chart that came with an order of Omaha Steaks.

   
Red-Hot Grill
Oven Broiler
Thickness
Doneness
First Side
Second Side
First Side
Second Side
Rare
3 mins
1 min
4 mins
3 mins
½"
Medium
4 mins
2 mins
7 mins
4 mins
Ruined
6 mins
4 mins
9 mins
7 mins
Rare
4 mins
2 mins
5 mins
4 mins
¾"
Medium
5 mins
3 mins
7 mins
5 mins
Ruined
7 mins
5 mins
10 mins
8 mins
Rare
5 mins
3 mins
6 mins
5 mins
1"
Medium
6 mins
4 mins
8 mins
6 mins
Ruined
8 mins
6 mins
11 mins
9 mins
Rare
5 mins
4 mins
7 mins
5 mins
1¼"
Medium
7 mins
5 mins
8 mins
7 mins
Ruined
9 mins
7 mins
12 mins
10 mins
Rare
6 mins
4 mins
7 mins
6 mins
1½"
Medium
7 mins
6 mins
9 mins
7 mins
Ruined
10 mins
8 mins
13 mins
11 mins
Rare
7 mins
5 mins
8 mins
7 mins
1¾"
Medium
8 mins
7 mins
9 mins
8 mins
Ruined
11 mins
9 mins
14 mins
12 mins

 

Cooking - Steak Temperatures & Times