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:
Zettagram to Gram Ounce to Quarter (British) Kilogram to Centigram Delisle to Fahrenheit Octal (Base 8) to Duotrigesimal (Base 32) Centigram to Decigram Microgram to Centigram Pound to Grain Teragram to Gram Centimeter to Decimeter Unicode for HTML (decimal) to Unicode Foot per hour to Meter per hour Mile per hour to Speed of sound Quinary (Base 5) to Ternary (Base 3) Yottagram to Gigagram
Other conversions:
Text to Unicode Resolution to Megapixel Date to Zodiac (Tropical) Unicode to Unicode for HTML (decimal) Text to Unicode for HTML (decimal) Date to Zodiac (Western) Unicode to Text Text to Unicode for HTML (hexadecimal) Unicode to Unicode for HTML (hexadecimal) 