UTC/GMT/Z Time Conversion Info
Current Local Time
Current UTC Time
UTCLocal
00Z
03Z
06Z
09Z
UTCLocal
12Z
15Z
18Z
21Z
Temperature Conversion Info
Temperature

 From:
Farenheit
Celcius
Kelvin
Reaumur
Rankine
Romer
Delisle
Newton
Vapor Pressure Info
Dew Point F
Relative Humidity, Absolute Humidity & LCL Estimate Info
Temp FDew Point F
Dew Point, Heat Index &
Summer Simmer Index
Info
Temp FHumidity %
Wet Bulb, Theta-E, Mixing Ratio, Air Density, Specific Humidity, Virtual Temperature Info
Temp FHumidityPressure MB

Theta & Saturated Mixing Ratio Info
Temp FPressure MB 
Station Pressure Info
Altimeter INElevation FT
Wind Speed Conversion & Beaufort Number Info
Wind Speed

 From:
Miles per Hour
Knots
Kilometers per Hour
Meters per Second
Feet per Second
Distance Conversion Info
Distance

 From:
Miles
Nautical Miles
Kilometers
Meters
Yards
Feet
Inches
Centimeters
Millimeters
Altimeter Setting Info
Station Pressure INElevation FT
Wind Direction & Speed Info
U V
Wind U/V Components Info
Direction [°]Speed [kts]
Wind Degrees to Direction Info
Degrees
Wind Chill Info
Temp FSpeed MPH
Saturation Vapor Pressure Info
Temp F
Pressure Altitude Info
Pressure MB 
Coordinate Conversion Info
DegreesMinutesSeconds
Distance & Bearing Info
 LatitudeLongitude
Point A:
Point B:
  
Pressure Conversion Info
Pressure

 From:
Inches of Mercury
Millibars
Kilopascals
Pascals
Atmospheres
PSI
* Most of the calculations used can be found here.