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The unit converters by Cactus2000 are also available as an Offline-Version. The collection of more than 100 converters may be ordered for a price of € 15.-.

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Unit Converters

Cactus2000 offers more than 100 unit converters and other calculators from physics, chemistry, meteorology, geometrie, money, date and time and miscellaneous. There is a choice from unit converters for classical problems like temperature units to special problems like measures of air pollutants. In addition there are calculators for frequently needed calculations like the calculations of percents and areas. Here is an overview:

Physics
Acceleration Area Area 2 Density Electric charge Electric resistance / conductance Electric resistivity / conductivity Energy Energy equivalents Energy per mass Flow rate (chemical) Flow rate (mass) Flow rate (volume)	Force Frequency Half-life Heat transfer coefficient Illuminance Length Length 2 Luminance Mass Mass 2 Mass to weight Ohm's Law - Power Power Power to Energy	Pressure Radioactivity Rotation Sound Speed Speed 2 Speed of sound Temperature Torque Viscosity Viscosity, dynam. Viscosity, kinem. Volume Volume 2 Wavelength
Chemistry, Meteorology
Air pollution Concentration Distance of lightning Energy (chem.) Hardness of water Humidity Ideal gas law	Mass mixing ratio Mixtures Ozone column Precipitation Rate constant (1. order)	Rate constant (2. order) Snow height Standard atmosphere Volume mixing ratio Wind direction Wind velocity
Date and time
Alarm clock Calendar Date of Easter	Day differences Difference clock Stop watch	Time differences Time units
Geometry
Area (square/circle) Angle Circle / Sphere Gradient	Linear interpolation Polar coordinates Quadratic equation	Rectangle Square / Cube Volume (cube/sphere)
Money
Comparison of electricity consumption Comparison of prices Costs of car fuel and CO₂ Euro	Gold in jewellery Increase of prices Interest on savings Price of electricity Price per small area	Price per large area Price per length Price per volume Price per weight Value added tax
Miscellaneous
Bits & bytes BMI Braking distance Data transfer	Fuel consumption Great circle Logarithms Map scale	MULTIPLES Numbering systems Percent calculations Transmission of bicycle UNIX file permissions

All converters are written in JavaScript. Therefore they might be used again and again without reloading the webpage.
With Cactus2000 converters you see the input value and the result for many units at the same time.
Only the most frequent units are considered to preserve overview.
Presently, 105 unit converters and similar tools are available.
With copy/paste-functions, e.g. Cntr-C/Cntr-V you may exchange data between Cactus2000 converters and other applications.
All of them are available as popups also. These are very handy when many windows are open on the screen.

POPUPs
Acceleration Air pollution Alarm clock Angle Area Area 2 Area (square/circle) Bits & Bytes BMI Braking distance Calendar Comparison of electricity consumption Comparison of prices Concentration Circle / Sphere Costs of car fuel and CO₂ Data transfer Date of Easter Day difference Density Difference clock Distance of lightning Electric charge Electric resistance / conductance Electric resistivity / conductivity Energy Energy (chem.) Energy equivalents Energy per mass Euro Flow rate (chemical) Flow rate (mass) Flow rate (volume)	Force Frequency Fuel consumption Gold in jewellery Gradient Great circle Half-life Hardness of water Heat transfer coefficient Humidity Ideal gas law Illuminance Increase of prices Interest on savings Length Length 2 Linear interpolation Logarithms Luminance Map scale Mass Mass 2 Mass mixing ratio Mass to weight Mixtures MULTIPLES Numbering systems Ohm's Law - Power Ozone column Polar coordinates Power Percent calculations Power to Energy Precipitation Pressure Price of electricity	Price per small area Price per large area Price per length Price per volume Price per weight Quadratic equation Radioactivity Rate constant (1. order) Rate constant (2. order) Rectangle Rotation Snowheight Sound Speed Speed 2 Speed of sound Standard atmosphere Square / Cube Stop watch Temperature Time difference Time units Torque Transmission of bicycle UNIX file permissions Value added tax Viscosity Viscosity, dynam. Viscosity, kinem. Volume Volume 2 Volume (cube/sphere) Volume mixing ratio Wavelength Wind direction Wind velocity