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: British converter Mass units of the British adaptation of the Avoirdupois 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:
CMYK to RGB Exagram to Zettagram Decimal (Base 10) to Quaternary (Base 4) Hectogram to Femtogram Kilometer per hour to Speed of light Yard to Foot Hundredweight to Ounce Duotrigesimal (Base 32) to Quinary (Base 5) Speed of light to Speed of sound Octal (Base 8) to Ternary (Base 3) Foot per second to Kilometer per hour Megagram (Tonne) to Centigram Speed of sound to Mile per hour Centigram to Milligram Microgram to Femtogram
Other conversions:
Unicode to Text Resolution to Megapixel Unicode to Unicode for HTML (decimal) Date to Zodiac (Tropical) Text to Unicode for HTML (hexadecimal) Unicode to Unicode for HTML (hexadecimal) Text to Unicode for HTML (decimal) Date to Zodiac (Western) Text to Unicode 