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The following calculators help you

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

Degrees to Radians and vice versa

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

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

Temperature Equivalents
F:
C:

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

Energy To 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