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:
Ton to Grain Pound to Quarter Quarter to Ton Vigesimal (Base 20) to Hexadecimal (Base 16) Speed of light to Knot Knot to Foot per hour Decimal (Base 10) to Vigesimal (Base 20) Ton (US) to Quarter (British) Decimeter to Hectometer Yottagram to Centigram Newton to Delisle Vigesimal (Base 20) to Octal (Base 8) Hundredweight (US) to Dram Foot per second to Kilometer per hour Megagram (Tonne) to Kilogram
Other conversions:
Text to Unicode for HTML (decimal) Resolution to Megapixel Date to Zodiac (Western) Date to Zodiac (Tropical) Text to Unicode Text to Unicode for HTML (hexadecimal) Unicode to Text Unicode to Unicode for HTML (decimal) Unicode to Unicode for HTML (hexadecimal) 