Circular Measure

Troy Weight

Second (") = 1/60 minute

Minute (') = 60 seconds

Degree (°) = 60 minutes

Right angle = 90 degrees

Straight angle = 180 degrees

Circle = 360 degrees

24 grains = 1 pennyweight (dwt)

20 pennyweights = 1 ounce troy (oz t) = 480 grains

12 ounces troy = 1 pound troy (lb t) = 240 pennyweights

= 5,760 grains

Apothecaries Weights

20 grains = 1 scruple (s ap)

3 scruples = 1 dram apothecaries (dr ap) = 60 grains

8 drams apothecaries = 1 ounce apothecaries (oz ap) = 24 scruples = 480 grains

12 ounces apothecaries = 1 pound apothecaries

(lb ap) = 96 drams apothecaries = 288 scruples = 5, 760 grains

Inches (in) x 25.4 = millimeters

Feet (ft) x .3 = meter

Yards (yd) x .9 = meters

Miles (mi) x 1.6 = kilometers

Square inches (in²) x 6.5 = sq centimeters

Square Feet (ft²) x .1 = sq meter

Square yards (yd²) x .8 = sq meter

Acres x .4 = hectare

Cubic Feet (ft³) x .03 = cu meter

Cord (cd) x 3.6 = cu meter

Quarts (lq) (qt) x .9 = liter

Gallons (gal) x .004 = cu meters

Ounces (oz) (avdp) x 28.4 = grams

Pounds (lb) (avdp) x .5 = kilogram

Horsepower (hp) x .7 = kilowatt Degrees

Fahrenheit (-32) x 5/9 = degrees Celsius

Millimeters (mm) x .04 = inch

Meters x 3.3 = feet

Meters (m) x 1.1 = yards

Kilometers x .6 = mile

Sq centimeters (cm²) x .2 = sq inch

Sq meter (m²) x 10.8 = sq feet

Sq meter (m²) x 1.2 = sq yards

Hectare (ha) x 2.5 = acres

Cu meters (m³) x 35.3 = cu feet

Liters (l) x 1.1 = quarts (lq)

Cu meters (m³) x 284.2 = gallons

Grams (g) x .04 = ounce (avdp)

Kilograms (kg) x 2.2 lbs (avdp)

Kilowatts (kW) x 1.3 = horsepower

Degrees Celsius x 9/5 + 32 = degrees Fahrenheit

Customary

Metric

Metric

Customary

Inch (in)

= 25.4 millimeters

Millimeter (mm)

= .001 meter = .039 inch

Foot (ft)

= 12 in - .305 meter

Centimeter (cm)

= .01 meter = .394 inch

Yard (yd)

= 36 in or 3 ft = .914 meter

Decimeter (dm)

= .1 meter = 3.937 inch

Mile (mi)

= 5,280 ft = 1.609

kilometer Meter (m)

= 3.281 feet

In² (sq in)

= 6.453 cm²

Kilometer (km)

= 1,000 meters = .621 mile

Ft² (sq ft)

= 144 sq in = .093 m²

Sq millimeter (mm²)

= .000001 m² = .002 sq in

Yd² (sq yd)

= 1,296 sq in = .836 m² = 9 sq ft

Sq centimeter (cm²)

= .0001 m² = .155 sq in

Acre

= 43,560 sq ft = .405 ha

Sq decimeter (dm²)

= .01 m² = 15.5 sq in

Mile² (sq mi)

= 640 acres = 2.59 km²

Sq meter (m²)

= 10.764 sq ft

Hectare (ha)

= 10,000 m² = 2.471 acres

Sq kilometer (km)²

= 1,000,000 m² = .386 sq miles