On this page I collected a few Java Scripts to convert all kinds of units. (Also, the scripts were broken somehow. I hopefully fixed them)
We have:


 
 



Acceleration Equivalents
First, type the number you wish converted here: 
Then, click radio buttons for desired conversion:
From: cm/sec/sec
m/sec/sec
m/hr/sec
km/hr/sec
ft/hr/sec
ft/sec/sec
ft/min/min
mi/hr/sec
knots/sec
To: cm/sec/sec
m/sec/sec
m/hr/sec
km/hr/sec
ft/hr/sec
ft/sec/sec
ft/min/min
mi/hr/sec
knots/sec

Area Equivalents
First, type the number you wish converted here: 
Then, click radio buttons for desired conversion:
From: Square Meters
Square Inches
Square Feet
Square Yards
Square Rods
Square Chains
Roods

Acres

Square Miles
To: Square Meters
Square Inches
Square Feet
Square Yards
Square Rods
Square Chains
Roods

Acres

Square Miles

Energy/Work Equivalents
First, type the number you wish converted here: 
Then, click radio buttons for desired conversion:
Fm: Joules
Kg-meters
Ft-lbs
Kw-hrs
Metric Hp-hrs
US Hp-hrs
Liter-atm
K-cal
Btu
To: Joules
Kg-meters
Ft-lbs
Kw-hrs
Metric Hp-hrs
US Hp-hrs
Liter-atm
K-cal
Btu

Length Equivalents
First, type the number you wish converted here: 
Then, click radio buttons for desired conversion:
From: Centimeters
Inches
Feet
Yards
Meters
Chains
Kilometers
Miles
To: Centimeters
Inches
Feet
Yards
Meters
Chains
Kilometers
Miles

U.S. Fluid or Liquid Equivalents
First, type the number you wish converted here: 
Then, click radio buttons for desired conversion:
From: Minims
Drams
Ounces
Gills
Pints
Quarts
Gallons
Barrels*
To: Minims
Drams
Ounces
Gills
Pints
Quarts
Gallons
Barrels*


*42 Gallon Unrefined petroleum oil - no "standard" liquid barrel

Mass Equivalents
First, type the number you wish converted here: 
Then, click radio buttons for desired conversion:
From: Kilograms

Grains

Troy Ounces
Avoirdupois Ounces*
Troy Pounds
Avoirdupois Pounds*
Short Tons
Long Tons
Metric Tons
To: Kilograms

Grains

Troy Ounces
Avoirdupois Ounces*
Troy Pounds
Avoirdupois Pounds*
Short Tons
Long Tons
Metric Tons


* Also known as Apothecary Ounces and Pounds

Metrology Equivalents
First, type the number you wish converted here: 
Then, click radio buttons for desired conversion:
From: Angstrom Units
Surface Microinch
Surface Microns
Light Bands*
Precision tenths
Close Tol. thousandths
Metric Milimeters
U.S. Inches
To: Angstrom Units
Surface Microinches
Surface Microns
Light Bands*
Precision tenths
Close Tol. thousandths
Metric Milimeters
U.S. Inches


* Monochromatic helium count

Power Equivalents
Type the number you wish converted here: 
Then click radio buttons for desired conversion:
From: Hp
Metric hp
Kw
Poncelets
Kg-m/sec
Ft-lb/sec
Kcal/sec
Btu/sec
To: Hp
Metric Hp
Kw
Poncelets
Kg-m/sec
Ft-lb/sec
Kcal/sec
Btu/sec

Velocity Equivalents
First, type the number you wish converted here: 
Then, click radio buttons for desired conversion:
Fm: cm/sec
m/sec
m/min
km/hr
ft/sec
ft/min
mi/hr
Knots
To: cm/sec
m/sec
m/min
km/hr
ft/sec
ft/min
mi/hr
Knots

Volume/Capacity Equivalents
First, type the number you wish converted here: 
Then, click radio buttons for desired conversion:
From: Cubic Inches
Cubic Feet
Cubic Yards
US Fluid Ounces*
US Liquid Quarts
US Dry Quarts
US Gallons
US Bushels
Liters

To: Cubic Inches
Cubic Feet
Cubic Yards
US Fluid Ounces*
US Liquid Quarts
US Dry Quarts
US Gallons
US Bushels
Liters



* Apothecary

Pressure Equivalents
First, type the number you wish converted here: 
Then, click radio buttons for desired conversion:
Fm: megadynes/
sq cm
kg/
sq cm
lb/
sq in
atmos-
pheres
Hg*
Meters
Hg*
Inches
H2O*
Meters
H20*
Inches
H20*
Feet
To: megadynes/
sq cm
kg/
sq cm
lb/
sq in
atmos-
pheres
Hg*
Meters
Hg*
Inches
H2O*
Meters
H2O*
Inches
H20*
Feet


*Standard columns of Mercury at 0o C, g = 980.665 cm/sec/sec
Standard columns of Water at 60o F, g = 32.1756 ft/sec/sec