Converters:
Computer data  Bytes  Resolution  Color code  Unicode
Length  Basic  Metric
Mass  Basic  Metric  American  British
Math  Positional notation  Angle  Numeral system
Speed  Basic
Temperature  Basic  Advanced
Time / date  Basic  Zodiac sign

Mass / weight units. Mass: American converter Mass units of the American customary system. All mass converters Basic mass converter (Dram, Grain, Gram, Hundredweight (British), Hundredweight (US), Ounce, Pound , Quarter (British), Quarter (US), Ton (British), Ton (US), Troy Ounce)  Metric mass converter (Yoctogram, Zeptogram, Attogram, Femtogram, Picogram, Nanogram, Microgram, Milligram, Centigram, Decigram, Gram, Decagram, Hectogram, Kilogram, Megagram (Tonne), Gigagram, Teragram, Petagram, Exagram, Zettagram, Yottagram)  American mass converter (Grain, Dram, Ounce, Pound, Quarter, Hundredweight, Ton)  British mass converter (Dram, Ounce, Pound, Stone, Quarter, Hundredweight, Ton) 
Mass fun fact The earth weighs approximately 5.9736 x 10^{24}kg (so that is 5,973,600,000,000,000,000,000,000).  source: NASA 

Common conversions:
Yoctogram to Microgram Ounce to Hundredweight Knot to Mile per hour Speed of sound to Meter per second Minute of arc to Degree Vigesimal (Base 20) to Quaternary (Base 4) Yoctogram to Decigram Inch to Kilometer Ton (US) to Ounce Milligram to Kilogram Megagram (Tonne) to Decagram Mile per second to Meter per second Dram to Ounce Octal (Base 8) to Quaternary (Base 4) Picogram to Petagram
Other conversions:
Unicode to Text Unicode to Unicode for HTML (hexadecimal) Date to Zodiac (Western) Text to Unicode Unicode to Unicode for HTML (decimal) Text to Unicode for HTML (hexadecimal) Text to Unicode for HTML (decimal) Date to Zodiac (Tropical) Resolution to Megapixel 