Metric System Conversion Factors

133

Metric System Conversion Factors

Area Equivalents

1 acre = 43,560 ft2 = 4840 yd2 = 0.4047 hectares = 160 rods2 = 4047 m2 = 0.0016 sq. mile

2

1 hectare (ha) = 10,000 m = 100 are = 2.471 acres = 107,639 ft

2

1 square meter (m2) = 10,000 square centimeter (cm2)

1 cubic foot (ft3) = 1728 in3 = 0.037 yd3 = 0.02832 m3 = 28,320 cm3

2

2

2

1 acre-inch = 102.8 m3 = 27,154 gal = 3630 ft3

1 cubic yard (yd3) = 27 ft3 = 0.765 m3

2

1 square yard (yd2) = 9 ft2 = 0.836 m2

1 square foot (ft ) = 144 in = 929.03 cm = 0.09290 m

Liquid Equivalents

1 ft3 of water = 7.5 gal = 62.4 lbs. = 28.3 liters

1 acre-inch of water = 27,154 gal = 3630 ft3

2

1 liter (l) = 2.113 pts. = 1000 ml = 1.057 qts. = 33.8 fl.oz. = 0.26 gal = 0.0001 m = 1,000 cm3

1 US gallon=4 qt.=8 pt. = 16 cups = 128 fl.oz. = 8.337 lbs of water = 3.785 L = 3785 ml = 231 in3 = 256 tbsp. = 0.1337 ft3

1 quart = 0.9463 liters = 2 pt. = 32 fl. oz. = 4 cups = 64 tablespoons (tbsp.)=57.75 in3 = 0.25 gal = 946.4 ml

1 pint = 16 fl. oz. = 2 cups = 473.2 ml = 32 level tablespoons = 0.125 gal = 0.5 qt

1 cup = 8 fl. oz. = ? pt. = 16 tablespoons = 236.6 ml

1 tablespoon = 14.8 ml = 3 teaspoons (tsp.) = 0.5 fl.oz.

1 milliliter (ml) = 1 cm3 = 0.034 fl.oz. = 0.002 pts

1 US fluid ounce = 29.57 ml = 2 tablespoons = 6 tsp. = 0.03125 qt

1 teaspoon = 4.93 ml = 0.1667 fl. oz. = 80 drops

Temperature Equivalents

Pressure Equivalents

degrees Centigrade = (¡ãF-32)x5/9

1 lb per square inch (PSI) = 6.9 kilopascal (kPa)

degrees Fahrenheit = (¡ãCx9/5)+32

1 PSI = 2.31 feet head of water

1 atm = 760 mmHg = 1.013 x 105 Pa = 1.013 bar = 14.70 psi

1 mmHg = 133.32 Pa = 0.133 kPa = 133,333 mPa

1Pa = 10-3 kPa = 10-6 mPa

1mPa = 103 kPa = 106 Pa

1kPa = 1cb = 0.001MPa =10 cm H 2 0 = 10 mbar = 0.01 bar = 1J/kg =

0.0099 atm. = 0.145 psi

Length Equivalents

centimeter (cm) = 0.3937 inch = 0.01 m = 0.03281 ft.

meter (m) = 3.28 feet = 39.4 inches = 100 cm = 1.094 yds = 1000 mm

kilometer = 0.621 statute mile = 1000 meters = 100,000 cm = 3281 ft = 39,370 in.

inch = 2.54 cm = 25.4 mm = 0.0254 m = 0.08333 ft.

foot = 0.3048 meters = 30.48 cm = 12 inches

yard = 0.9144 meters = 3 feet = 36 inches = 91.44 cm

statute mile = 1760 yards = 5280 feet = 1.61 kilometers = 1609 meters

Mixture Ratios

Flow

1 mg/g = 1000 ppm

1 fl.oz./gal = 7490 ppm

1 gpm = 0.134 ft3/minute = 0.06308 liter/sec

1 fl.oz./100 gal = 75 ppm

1 qt/100 gal = 2 tablespoons/1.0 gal

1 ft3/min. (cfm) = 449 gal/hr. (gph) = 7.481 gal/min

1 pt/100 gal = 1 teaspoons/1gal

134

Weight Equivalents

1 ton (US) = 2000 lb = 0.907 metric tons = 907.2 kg

1 metric ton = 106 g = 1000 kg = 2205 lb

1 lb = 16 oz = 453.6 grams (g) = 0.4536 kg

1 oz (weight) = 28.35 g = 0.0625 lb

1 gram = 1000 mg = 0.0353 oz = 0.001 kg = 0.002205 lb

milligrams (mg) = 0.001 grams

1 kilogram (kg) = 1000 grams = 35.3 oz = 2.205 lbs

microgram (? g) = 10-6 grams = 0.001 mg

picogram = 10-12 grams

-9

nanogram (ng) = 10 grams = 0.001 micrograms (:g)

1 ppm = 0.0001% = 1 mg/kg = 1 mg/L = 1 ? g/g = 1?l/l = 1?g/mL = 0.379 g in 100 gal water = 8.34 x 10-6 lb/gal = 0.013 fl oz in 100 gal

10 ppm = 0.001% = 10 mg/L

100 ppm = 0.01% = 100 mg/L

1 ppb = 1 ?g/kg = 1 ?g/L = 1 ng/mL = 1 ng/1,000,000,000

1 ppt = 1 picogram/g

1% = 10,000 ppm = 10g/L = 1g/100ml = 10g/kg = 1.33 oz by weight/gal water = 8.34 lbs/100 gal water

1% (v/v) = 1.28 fl.oz./gal = 1 gal/100 gal

1000 ppm = 1 mg/g = 0.1% = 1000 mg/L

135

Approximate Weight of Dry Soil

Type

g/cm3

lbs/ft3

lbs/acre

(6 inches deep)

sand

1.6

100 (or 2700 lbs/yd3)

2,143,000

loam

1.3 to 1.55

80-95

1,714,000

clay or silt

1.0 to 1.30

65-80

1,286,000

0.65

40

860,000

0.325

20

430,000

muck

peat (compact)

3

Sand weights (tons):

=

yd

x

1.3

Gravel weights (tons):

=

ft3

x

110

-0.5- to 1-inch diameter gravel

=

2,700 lbs/ton

-0.25- to 0.375-inch diameter gravel

=

3,000 lbs/ton

Approximate Organic Materials for six inch depth per 1,000 sq.ft. (variance in volume of organic materials used may occur).

Desired Organic Materialo Volume in Mix

(%)

Approximate thickness applied to soil surfaces

(inches)

Organic Material Needed (cu. yd.)

per 1,000 sq.ft.

5

0.33

1.0

10

0.67

2.0

15

1.00

3.0

20

1.33

4.0

25

1.67

5.0

30

2.00

6.0

Example: If 10% organic materials is to be incorporated into the top 6-inches of a 1,000 sq.ft. area. From the chart below: the organic material is applied to a depth of 0.67 inches and 2.0 cu. yds. will

be needed.

Peat Moss Coverage

Coverage (sq.ft.)

Depth (inches)

5.6 cu. ft. Bale (compressed) when loosened covers

4.0 cu.ft Bale (compressed) when loosened covers

0.25

480

346

0.50

240

173

1.00

120

86

2.00

60

43

3.00

40

29

4.00

30

22

6.00

20

14

136

Conversions for determining turfgrass irrigation needs

1 acre-inch

=

27,154 gal

=

43,560 cu.in.

1 inch/1000 sq.ft.

=

620 gal

=

83 cu.ft.

1 gallon

=

0.134 cu.ft.

=

8.34 lbs

1 million gallon

=

3.07 acre-feet

7? gallons

=

1 cu.ft.

=

231 cu.in.

1 acre-foot

=

325,851 gal

=

43,560 cu.ft.

1 pound of water

=

0.1199 gal

Precipitation rate (in/hr)

=

gpm x 96.3

area (ft2)

Water and Soil Calculations

1 mmhos/cm = 1,000?mhos/cm = 1 dS/m = 1mS/cm

1 meq/L = 1 mmol/L = 1mol/m3

1 meq/100g = 1mmol/100g = cmol/kg

=

3,630 cu.ft.

Energy

1 calorie (cal)

=

4.184 Joule

Joule (J)

=

1 kg m2 s-2

1 kcal

=

4.184 kJ

137

Metric Conversion Factors

To Convert

Multiply by

To Obtain

Acres (a)

0.4047

Hectare (ha)

Acres

43,560

Sq. feet (ft2)

Acres

0.00405

Sq. kilometer (km2)

Acres

4047

Sq. meter (m2)

Acres

4840

Sq. yards (yd2)

Acre-feet

325,851

Sq. feet (ft2)

Acre-feet

43560

Cu. Feet (ft3)

Acre-feet

1233.5

m3

Acre-inch

102.8

m3

Bar

14.5

lb/in2

Bar

1019.7

g/cm3

Bar

29.53

inches Hg @ 0oC

Bar

75

cm Hg @ 0oC

Bar

0.001

J/kg

Bar

100

kPa

0.03524

m2

Bushels

1.245

ft3

Calorie (cal)

4.184

Joules (J)

Bushels (dry)

Centimeters (cm)

0.03281

Feet (ft)

cm

0.3937

Inches (in)

cm

0.1094

Yards (yd)

cm

0.01

Meters (m)

cm

10

Millimeters (mm)

cm/sec

1.9685

ft/min

cm/sec

0.0223694

MPH

2

0.001076

ft2

0.1550

in2

0.0610237

in3

cm (square centimeters)

cm2

3

cm (cubic centimeters)

cm3

0.0338

fl oz

Cup

8

fl oz

Cup

236.6

cm3

Feet (ft)

30.48

cm

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