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:
Hectometer to Meter Decameter to Decimeter Mile per second to Mile per hour Teragram to Picogram Foot per second to Meter per hour Quinary (Base 5) to Binary (Base 2) Quarter to Hundredweight Picogram to Attogram Milligram to Nanogram Quinary (Base 5) to Octal (Base 8) Vigesimal (Base 20) to Decimal (Base 10) Megagram (Tonne) to Microgram Exagram to Gram Duotrigesimal (Base 32) to Vigesimal (Base 20) Speed of light to Foot per second
Other conversions:
Text to Unicode Resolution to Megapixel Unicode to Unicode for HTML (decimal) Unicode to Text Date to Zodiac (Tropical) Unicode to Unicode for HTML (hexadecimal) Text to Unicode for HTML (decimal) Text to Unicode for HTML (hexadecimal) Date to Zodiac (Western) 