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:
Picogram to Nanogram Kilogram to Zeptogram Zettagram to Gram Hectometer to Kilometer Ton (US) to Quarter (British) Meter to Decimeter Decigram to Decagram Duotrigesimal (Base 32) to Decimal (Base 10) Knot to Foot per hour Duodecimal (Base 12) to Quaternary (Base 4) Kilogram to Femtogram Hectogram to Yottagram Ounce to Hundredweight (US) Meter to Kilometer Binary (Base 2) to Decimal (Base 10)
Other conversions:
Unicode to Unicode for HTML (hexadecimal) Date to Zodiac (Western) Unicode to Unicode for HTML (decimal) Date to Zodiac (Tropical) Unicode to Text Text to Unicode for HTML (decimal) Text to Unicode for HTML (hexadecimal) Resolution to Megapixel Text to Unicode 