Here are some key features of "WM9 Bitrate Calculator":

· Calculates the required video bit rate for a target WMV file size
· Supported movie length: 99 hours 59 minutes 59 seconds
· Unlimited file size support under Custom File Size based mode
· Supported Disk Size Based modes: 1/3, 1/2, 1, 2, 3, 4, or 5 disks of 650 MB, 700 MB, 800 MB, 870 MB, 2.60 GB, 3.95 GB or 4.70 GB
· Supported Audio bit rate modes: No Audio, 48 Kbps, 64 Kbps, 96 Kbps, 128 Kbps, 160 Kbps, 224 Kbps, 256 Kbps, 320 Kbps, 384 Kbps, 440 Kbps, 640 Kbps and 768 Kbps
· Percentage Error gives you the ability to increase the target video bit rate from -9% to 9% (this is useful if you keep getting lower/higher file sizes for 2-pass VBR encodes in your PC)
· File > Always On Top
· Edit > Copy video bit rate, copies the current video Bitrate to clip board
· Edit > Save to Notepad: displays a summary of the calculation in Notepad
· Edit > Save to Log: enabled by default. Logs the summary of the calculation if the movie title was given
· Tools > Total Frames Calculator quickly shows the total number of frames in PAL/NTSC for the given movie length
· Tools > Movie Resolution Calculator calculates the width and height of the movie to resize preserving the aspect ratio
· Mode > Audio Mode: aimed for audio file calculations
· Remembers last used values in a XML file.