A Collection of Helpful or Amusing Javascripts
Automotive 

Spring Rate Calculator  Calculates Primary Spring Rate when using dualrate springs 
Airflow needed  Estimate airflow needed for horsepower 
Horsepower  Estimate Horsepower from intake airflow 
Carburetor Size  Calculates required carburetor size 
Fuel injector flow vs. pressure  Calculates fuel injector flow when changing fuel pressure 
Compression Ratio  Calculates Compression Ratio 
HP gain from boost  Estimate HP gain from boost pressure 
1/4 Mile MPH  Calculate 1/4 mile MPH from vehicle horsepower and weight 
1/4 Mile ET  Calculate 1/4 Mile ET from horsepower 
1/4 Mile Horsepower  Calculate Vehicle Horsepower from 1/4 mile MPH 
1/4 Mile Horsepower  Calculate Vehicle Horsepower from 1/4 mile ET 
MPH from gear ratios  Estimate MPH based on gear ratios and tire size 
Engine Size  Calculates engine size/bore/stroke/rod ratio 
Scientific, Mathematic and Misc. Scripts 

General Conversions  lb to Kg, ft/lb to NM, HP to KW, MPH to KPH... 
Periodic Table  A periodic table of the elements 
Temperature Converter  Converts between Celsius and Fahrenheit 
Coin Flipper  Randomly flips a coin 
Text Encrypter  Encrypts and decrypts text into binary form 
Quadratic solver  Solves that pesky quadratic formula 
Roman Numeral Converter  Converts regular numbers into Roman Numerals 
2nd order Polynomial  Calculates the real or complex roots of a 2nd order polynomial 
Acceleration Equivalents  Converts acceleration units 
Area Equivalents  Converts units of area 
Cylinder Volume  Calculates the volume of a cylinder 
Base Converter  Converts input between binary, ternary, quintal, octal, decimal, and hexadecimal bases 
Degrees to Radians  Converts degrees to radians 
Energy Equivalents  Converts Energy equivalents 
Your age in dog years  Calculates your age in dog years 
Wavelength  Calculates wavelength of a frequency 
WindChill  Calculates wind chill temperature 
Your Japanese Name  Tells you how to pronounce your name in Japanese 
Polygon  Figures characteristics of polygons 
Prime Number  Determines if input is prime 
Pythagorean Theorem  Enter a and b and the script solves for c 
Length Equivalents  Converts units of length 
Mass Equivalents  Converts units of mass 
Atmospheric Calculations  Provides atmospheric calculations based on altitude and speed 
LCM and GCD  Calculate the Least Common Multiple and Greatest Common Divisor of two numbers 
Factors  Determines factors of a number 
Kinetic Energy  Calculates Kinetic energy 
Driving Distance  Estimates Driving Distance between cities 
Airport Distance  Distances between major airports 
Morse Code  Converts typed words into Morse Code 
Power Equivalents  Converts Power units 
Pressure Equivalents  Convert Pressure units 