Metric System Conversion Factors
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1 133 Metric System Conversion Factors Area Equivalents 1 acre = 43,560 ft 2 = 4840 yd 2 = hectares = 160 rods 2 = 4047 m 2 = sq. mile 1 acre-inch = m 3 = 27,154 gal = 3630 ft 3 1 hectare (ha) = 10,000 m 2 = 100 are = acres = 107,639 ft 2 1 square meter (m 2 ) = 10,000 square centimeter (cm 2 ) 1 cubic foot (ft 3 ) = 1728 in 3 = yd 3 = m 3 = 28,320 cm 3 1 cubic yard (yd 3 ) = 27 ft 3 = m 3 1 square foot (ft 2 ) = 144 in 2 = cm 2 = m 2 1 square yard (yd 2 ) = 9 ft 2 = m 2 Liquid Equivalents 1 ft 3 of water = 7.5 gal = 62.4 lbs. = 28.3 liters 1 acre-inch of water = 27,154 gal = 3630 ft 3 1 liter (l) = pts. = 1000 ml = qts. = 33.8 fl.oz. = 0.26 gal = m 2 = 1,000 cm3 1 US gallon=4 qt.=8 pt. = 16 cups = 128 fl.oz. = lbs of water = L = 3785 ml = 231 in 3 = 256 tbsp. = ft 3 1 quart = liters = 2 pt. = 32 fl. oz. = 4 cups = 64 tablespoons (tbsp.)=57.75 in 3 = 0.25 gal = ml 1 pint = 16 fl. oz. = 2 cups = ml = 32 level tablespoons = gal = 0.5 qt 1 cup = 8 fl. oz. = ½ pt. = 16 tablespoons = ml 1 tablespoon = 14.8 ml = 3 teaspoons (tsp.) = 0.5 fl.oz. 1 milliliter (ml) = 1 cm 3 = fl.oz. = pts 1 US fluid ounce = ml = 2 tablespoons = 6 tsp. = qt 1 teaspoon = 4.93 ml = fl. oz. = 80 drops Temperature Equivalents degrees Centigrade = ( F-32)x5/9 degrees Fahrenheit = ( Cx9/5)+32 Pressure Equivalents 1 lb per square inch (PSI) = 6.9 kilopascal (kpa) 1 PSI = 2.31 feet head of water 1 atm = 760 mmhg = x 10 5 Pa = bar = psi 1 mmhg = Pa = kpa = 133,333 mpa 1Pa = 10-3 kpa = 10-6 mpa 1mPa = 10 3 kpa = 10 6 Pa 1kPa = 1cb = 0.001MPa =10 cm H 20 = 10 mbar = 0.01 bar = 1J/kg = atm. = psi Length Equivalents centimeter (cm) = inch = 0.01 m = ft. kilometer = statute mile = 1000 meters = 100,000 cm = 3281 ft = 39,370 in. inch = 2.54 cm = 25.4 mm = m = ft. yard = meters = 3 feet = 36 inches = cm meter (m) = 3.28 feet = 39.4 inches = 100 cm = yds = 1000 mm foot = meters = cm = 12 inches 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 = ft 3 /minute = liter/sec 1 fl.oz./100 gal = 75 ppm 1 qt/100 gal = 2 tablespoons/1.0 gal 1 ft 3 /min. (cfm) = 449 gal/hr. (gph) = gal/min 1 pt/100 gal = 1 teaspoons/1gal
2 134 Weight Equivalents 1 ton (US) = 2000 lb = metric tons = kg 1 metric ton = 10 6 g = 1000 kg = 2205 lb 1 lb = 16 oz = grams (g) = kg 1 oz (weight) = g = lb 1 gram = 1000 mg = oz = kg = lb milligrams (mg) = grams 1 kilogram (kg) = 1000 grams = 35.3 oz = lbs microgram (µg) = 10-6 grams = mg nanogram (ng) = 10-9 grams = micrograms (:g) picogram = grams 1 ppm = % = 1 mg/kg = 1 mg/l = 1 µg/g = 1µl/l = 1µg/mL = g in 100 gal water = 8.34 x 10-6 lb/gal = fl oz in 100 gal 10 ppm = 0.001% = 10 mg/l 100 ppm = 0.01% = 100 mg/l 1000 ppm = 1 mg/g = 0.1% = 1000 mg/l 1 ppb = 1 µg/kg = 1 µg/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
3 135 Approximate Weight of Dry Soil Type g/cm 3 lbs/ft 3 (6 inches deep) lbs/acre sand (or 2700 lbs/yd 3 ) 2,143,000 loam 1.3 to ,714,000 clay or silt 1.0 to ,286,000 muck ,000 peat (compact) ,000 Sand weights (tons): = yd 3 x 1.3 Gravel weights (tons): = ft 3 x to 1-inch diameter gravel = 2,700 lbs/ton to 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 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 Depth (inches) Coverage (sq.ft.) 5.6 cu. ft. Bale (compressed) when loosened covers 4.0 cu.ft Bale (compressed) when loosened covers
4 136 Conversions for determining turfgrass irrigation needs 1 acre-inch = 27,154 gal = 43,560 cu.in. = 3,630 cu.ft. 1 inch/1000 sq.ft. = 620 gal = 83 cu.ft. 1 gallon = cu.ft. = 8.34 lbs 1 million gallon = 3.07 acre-feet 7½ gallons = 1 cu.ft. = 231 cu.in. 1 acre-foot = 325,851 gal = 43,560 cu.ft. 1 pound of water = gal Precipitation rate (in/hr) = gpm x 96.3 area (ft 2 ) Energy 1 calorie (cal) = Joule Water and Soil Calculations Joule (J) = 1 kg m 2 s -2 1 mmhos/cm = 1,000µmhos/cm = 1 ds/m = 1mS/cm 1 kcal = kj 1 meq/l = 1 mmol/l = 1mol/m 3 1 meq/100g = 1mmol/100g = cmol/kg
5 137 Acres (a) Hectare (ha) Acres 43,560 Sq. feet (ft 2 ) Acres Sq. kilometer (km 2 ) Acres 4047 Sq. meter (m 2 ) Acres 4840 Sq. yards (yd 2 ) Acre-feet 325,851 Sq. feet (ft 2 ) Acre-feet Cu. Feet (ft 3 ) Acre-feet m 3 Acre-inch m 3 Bar 14.5 lb/in 2 Bar g/cm 3 Bar inches 0 o C Bar 75 cm 0 o C Bar J/kg Bar 100 kpa Bushels (dry) m 2 Bushels ft 3 Calorie (cal) Joules (J) Centimeters (cm) Feet (ft) cm Inches (in) cm Yards (yd) cm 0.01 Meters (m) cm 10 Millimeters (mm) cm/sec ft/min cm/sec MPH cm 2 (square centimeters) ft 2 cm in 2 cm 3 (cubic centimeters) in 3 cm fl oz Cup 8 fl oz Cup cm 3 Feet (ft) cm
6 138 ft m ft 305 mm ft 2 (square feet) 929 cm 2 ft m 2 ft x 10-6 Hectares (ha) ft 3 (cubic feet) m 3 ft Gallons ft Cubic inches (in 3 ) ft Cubic yards (yd 3 ) ft Liters (L) ft 3 /1,000 ft m 3 /100 m 2 Feet per minute MPH Feet head of water PSI Foot candle Lux Gallons (gal) Liters Gal 3785 Milliliters Gal 128 Ounces (liquid) Gal ft 3 Gal/acre (gpa) Liters/hectare gpa L/100 m 2 gpa oz/1,000 ft 2 (liquid) Gal/1,000 ft L/100 m 2 Gal/minute x 10-3 Cubic feet/second Gal/min L/sec Gal/min m 3 /hr Grams (g) Pounds Gram oz g/cm lb/in 3 g/cm lb/ft 3 g/ft 2 96 lb/acre g/ha lbs/acre g/ha oz/acre
7 139 g/kg 0.10 percent (%) g/liter 1000 PPM g/liter 10 Percent g/liter lbs/gal g/liter oz/gal g/m lb/ft 2 g/m lbs/1,000 ft 2 Hectares (ha) Acres Ha 107,639 ft 2 Ha ,000 ft 2 horsepower (hp) (electrical or mechanical) 746 watts hp 550 ft-pounds/sec hp metric horsepower Inches Centimeters Inches Meters Inches Millimeters Inches of mercury 3.4 kilopascals (kpa) in/ft mm/mm in cm 2 in cm 3 in fl oz in qt Joules per kilograms (J/kg) 1 kpa kilo Pascal (kpa) 1 J/kg kpa bar kpa 0.01 bar Kilograms (kg) Pounds kg/hectare Pounds/acre kg/ha lb/1,000 ft 2 kg/100 m lbs/1,000 ft 2 kg/l lb/gal Kilometers (Km) 100,000 Centimeters
8 140 Kilometers 3281 feet Kilometers 1000 meters Kilometers miles Kilometers 1094 yards Km/h MPH Km/h ft/min Kilopascals (kpa) lbs/in 2 (psi) kpa bar kpa 1 J/kg Liters (L) gallons L ounces L pints L quarts L ft 3 L/m ft 3 /1,000 ft 2 L/100 m gal/1,000 ft 2 L/100 m pt/1,000 ft 2 Liters/hectare gallons/acre L/ha gal/1,000 ft 2 L/ha oz/1,000 ft 2 L/ha pt/a L/min gal/hr Meters (m) Feet Meters Inches Meters yards Meters 100 Centimeters Meters Kilometers Meters 1000 Millimeters Meters/sec mph M 2 (square meters) ft 2 M 2 1,550 in 2 M yd 2
9 141 M 3 (cubic meters) ft 3 M yd 3 M 3 /ha ft 3 /acre M 3 /ha yd 3 /1,000 ft 2 M 3 /ha ft 3 /1,000 ft 2 mil inch mil millimeters Miles (nautical) Miles (statute) Miles (statute) 160,900 Centimeters Miles 5280 Feet Miles Kilometers Miles 1760 Yards Miles/hour (mph) Feet/second mph 88 Feet/minute mph 1.61 Kilometers/hour mph meter/second mg/kg 1 Parts per million (ppm) Milliequivalents per liter (meq/l) 1 Millimoles per liter (mmol/l) Milliequilvalents per 100 g (meq/100g) Eq. wt. x 10 Parts per million (ppm) Millimhos per centimeter (mmhos/cm) 1 Decisiemens per meter (ds/m) mmhos/cm 1,000 Micromhos per centimeter (µmhos/cm) Milliliters (ml) Ounces (fluid) ml Gallons ml/m oz/1,000 ft 2 ml/l oz/gal ml/10,000 L fl oz/1,000 gal Millimeters (mm) Inches 1 mm 0 C kpa 1 mm Hg mpa Ounces (fluid) Liters Ounces (fluid) Milliliters Ounces (fluid) qt.
10 142 Oz (fluid)/gal 7.81 ml/l Ounces (fluid)/acre L/ha Ounces (fluid)/acre 73.1 ml/ha Ounces (fluid)/1,000 ft L/ha oz (weight) Grams oz (weight) lb oz (weight)/acre 0.07 kg/ha oz (weight)/acre 70 g/ha oz (weight)/1,000 ft kg/ha oz (weight)/ft g/m 2 oz (weight)/gal 7.5 g/l oz (weight)/1,000 ft g/m 2 Percent (%) 10 g/kg Pint (liquid) liter pt/a L/ha pt/a oz/1,000 ft 2 pt/1,000 ft L/100 m 2 Parts per million (ppm) lb ai/acre foot of water PPM 2.0 lbs/acre slice 7-in. deep PPM 2.25 kg/ha slice 7-in. deep PPM g/l PPM 8.34 lb/million gal PPM 1 mg/kg PPM Ounces/100 gal of water PPM Gal/acre-foot of water PPM lbs/million gal of water Pounds (lbs) Kilograms (kg) Pounds Grams Pounds/acre 1,120 g/hectare Pounds/acre 1.12 kg/hectare Pounds/acre g/100 ft 2 Pounds/acre lb/1,000 ft 2
11 143 Pounds/acre g/m 2 Pounds/acre-foot g/m 3 Pounds/acre-foot kg/m 3 Pounds/ ft g/m 2 Pounds/ft kg/m 3 Pounds/1,000 ft g/m 2 Pounds/1,000 ft kg/ha Pounds/1,000 ft lb/a Pounds/1,000 ft g/100 m 2 Pounds/1,000 ft kg/100 m 2 Pounds/1,000 ft lbs/100 yd 2 Pounds/1,000 ft lbs/1,000 ft 2 Pounds/yd g/cm 3 Pounds/yd g/m 3 Pounds/yd kg/m 3 Pounds/gallon 0.12 kg/liter Pounds/1,000 gal 0.12 g/1,000 L PSI (pounds per square inch) 6.89 Kilopascals (kpa) PSI Bar PSI Atmosphere (atm) PSI 2.31 feet head of water Quarts Liters Quarts 946 Millimeters Qt/A L/ha Qt/A oz/1,000 ft 2 Qt/100 gal 2.5 ml/l
12 144 Ton (metric) 2,205 lb Ton (metric) 1,000 kg Ton (metric) ton (2,000 lb) Yards (yd) Centimeters Yards Meters Yards Millimeters yd M 2 yd 3 (cubic yards) 27 ft 3 yd 3 46,656 in 3 yd m 3 yd L yd 3 /1,000 ft m 3 /100 m 2 P 2O P K 2O K CaO Ca MgO Mg meq Ca +2 /100 g soil 400 lbs Ca +2 per acre furrow slice meq K + /100 g soil 780 lbs K + per acre furrow slice meq Na + /100 g soil 460 lbs Na + per acre furrow slice meq Mg +2 /100 g soil 109 lbs Mg +2 per acre furrow slice meq Fe +3 /100 g soil 372 lbs Fe +3 per acre furrow slice meq Zn +2 /100 g soil 654 lbs Zn +2 per acre furrow slice meq H + /100 g soil 20 lbs H + per acre furrow slice meq Al +3 /100 g soil 180 lbs Al +3 per acre furrow slice meq Ca +2 /100 g soil 9.2 lbs Ca +2 per 1,000 sq.ft. furrow slice meq K + /100 g soil 18 lbs K + per 1,000 sq.ft. furrow slice meq Na + /100 g soil 10.6 lbs Na + per 1,000 sq.ft. furrow slice meq Mg +2 /100 g soil 2.5 lbs Mg +2 per 1,000 sq.ft. furrow slice meq Fe +3 /100 g soil 8.5 lbs Fe +3 per 1,000 sq.ft. furrow slice
13 145 meq Zn +2 /100 g soil 15 lbs Zn +2 per 1,000 sq.ft. furrow slice meq H + /100 g soil 0.46 lbs H + per 1,000 sq.ft. furrow slice meq Al +3 /100 g soil 4.1 lbs Al +3 per 1,000 sq.ft. furrow slice Decimal and Millimeter Length Equivalents Fraction (inch) Decimals (inch) Millimeters / / / ¾ / / / ½ / / / / / ¼ / / / / / / / / / / / / / [ / / /
14 146 5/ / / / / Slopes 10% = 6Ε = 10:1 33% = 18Ε = 3:1 18% = 10Ε = 6:1 50% = 26Ε = 2:1 25% = 14Ε = 4:1 100% = 45Ε = 1:1
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