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# NIST National Institute

General Tables of Units.
Guide for the use of SI.

# Wikipedia Articles

Units of measurement.
International System.
Ancient Greek units. Three nations have not officially adopted the International System of Units as their primary or sole system of measurement: Liberia, Myanmar and the United States.

# Mid-States Brochures # Unit Conversion Chart

 If you know Multiply by To Get If you know Multiply by To Get Length inches 2.54 centimeters millimeters 0.04 inches foot 30 centimeters centimeters 0.4 inches yards 0.91 meters meters 3.3 feet miles 1.6 kilometers kilometers 0.62 miles Area sq. inches 6.5 sq. centimeters sq. centimeters 0.16 sq. inches sq. feet 0.09 sq. meters sq. meters 1.2 sq. yards sq. yards 0.8 sq. meters sq. kilometers 0.4 sq. miles sq. miles 2.6 sq. kilometers hectares 2.47 acres acres 0.4 hectares Mass (Weight) ounces 28 grams grams 0.035 ounces pounds 0.45 kilograms kilograms 2.2 pounds short ton 0.9 metric ton metric tons 1.1 short tons Volume teaspoons 5 milliliters milliliters 0.03 fluid ounces tablespoons 15 milliliters liters 2.1 pints fluid ounces 30 milliliters liters 1.06 quarts cups 0.24 liters liters 0.26 gallons pints 0.47 liters cubic meters 35 cubic feet quarts 0.95 liters cubic meters 1.3 cubic yards gallons 3.8 liters cubic feet 0.03 cubic meters cubic yards 0.76 cubic meters Temperature Fahrenheit (F - 32) x 5/9 Celsius Celsius (C x 9/5) + 32 Fahrenheit

 To Convert Multiply By To Obtain Acres 43,560 Sq. feet Acres 0.00405 Sq. kilometer Acres 4047 Sq. meter Acres 4840 Sq. yards Acre-feet 325,851 Sq. feet Acre-feet 43560 Cu. feet Acre-feet 1233.5 m (cubed) Bar 14.5 Lb/sq.in. Bar 1019.7 g/cm (cubed) Bar 29.53 inches Hg at 0 degrees C Bushels (dry) 0.03524 msquared Centimeters (cm) 0.03281 Feet Centimeters (cm) 0.3937 Inches Centimeters (cm) 0.1094 Yards Centimeters (cm) 0.01 Meters Centimeters (cm) 10 Millimeters (ml) cm/sec 1.9685 ft/min cm/sec 0.0223694 MPH cm (cubed) 0.0610237 inch (cubed) Cubic feet 0.0283 Cu. meter Cubic feet 7.4805 Gallons Cubic feet 1728 Cubic inches Cubic feet 0.037 Cubic yards Cup 8 fl oz Feet (ft) 30.48 Centimeters Feet (ft) 0.3048 Meters Feet per minute 0.01136 MPH Feet head of water 0.433 PSI Foot candle 10.764 Lux Gallons (gal) 3.785 Liters Gal 3785 Millimeters Gal 128 Ounces (liquid) Gal/acre 9.354 Liters/hectare Gal/acre 2.938 Oz/1000 ftsquared (liquid) Gal/1000 ftsquared 4.0746 L/100 msquared Gal/minute 2.228 x 10 (-3) Cubic feet/second Grams (g) 0.002205 Pounds Grams (g) 0.035274 oz G/ha 0.000893 lbs/a Grams per liter 1000 PPM Grams per liter 10 Percent Grams/sq.meter 0.00020481 lb/sq.feet G/cm (cubed) 0.036127 lb/in (cubed) G/cm (cubed) 62.428 lb/ft (cubed) Hectares (ha) 2.471 Acres Inches 2.54 Centimeters Inches 0.0254 Meters Inches 25.4 Millimeters Insquared 6.4516 cmsquared In (cubed) 16.3871 cm (cubed) Kilograms (kg) 2.2046 Pounds Kg/hectare 0.892 Pounds/acre Kg/ha 0.02048 lb/1000 ftsquared Kg/L 8.3454 lb/gal Kilometers (Km) 100,000 Centimeters Kilometers (Km) 3281 Feet Kilometers (Km) 1000 Meters Kilometers (Km) 0.6214 Miles Kilometers (Km) 1094 Yards Km/h 0.62137 MPH Km/h 54.6807 ft/min Kilopascals (kPa) 0.145 Pounds/sq.in. (psi) Liters (l) 0.2642 Gallons Liters (l) 33.814 Ounces Liters (l) 2.113 Pints Liters (l) 1.057 Quarts L/100 msquared 0.2454 gal/1000 ftsquared Liters/hectare 0.107 Gallons/acre Meters (m) 3.281 Feet Meters (m) 39.37 Inches Meters (m) 1.094 yards Meters (m) 100 Centimeters Meters (m) 0.001 Kilometers Meters (m) 1000 Millimeters Meters/sec 2.2369 MPH Msquared 10.764 ftsquared M (cubed) 35.3147 ft (cubed) M (cubed) 1.30795 yd (cubed) Miles (statute) 160,900 Centimeters Miles 5280 Feet Miles 1.609 Kilometers Miles 1760 Yards Miles/hour (mph) 1.467 Feet/second Miles/hour (mph) 88 Feet/minute Miles/hour (mph) 1.61 Kilometers/hour Miles/hour (mph) 0.447 meter/second Milliliters (ml) 0.0338 Ounces (fluid) Milliliters (ml) 0.0002642 Gallons Millimeters (mm) 0.03937 Inches 1 mm Hg @ 0 C 0.13332 kPa Ounces (fluid) 0.02957 Liters Ounces (fluid) 29.573 Milliliters Ounces (weight) 28.35 Grams Parts per million (ppm) 2.719 lb ai/acre foot of water PPM 0.001 Grams/l PPM 8.34 Lb/million gal PPM 1 mg/kg PPM 0.013 Ounces/100 gal of water PPM 0.3295 Gal/acre-foot of water PPM 8.345 lbs/million gal of water Percent (%) 10 g/kg Pint 0.473 liter pt/A 1.1692 L/ha pt/A 0.3673 oz/1000 ftsquared Pounds 0.4536 Kilograms Pounds 453.6 Grams Pounds/acre 1.12 Kg/hectare Pounds/A 0.02296 lb/1000 ftsquared Pounds/sq.ft. 4883 Grams/sq.meter Pounds/1000 ftsquared 43.5597 lb/A Pounds/yd (cubed) 0.0005937 G/cm (cubed) Pounds/gallon 0.12 Kg/liter PSI (lbs/sq.in.) 6.9 Kilopascals PSI (lbs/sq.in.) 0.06895 Bar PSI (lbs/sq.in.) 0.068046 atm PSI (lbs/sq.in.) 2.31 feet head of water PSI (lbs/sq.in.) 6.89 kPa Quarts 0.9463 Liters Qt/A 2.3385 L/ha Qt/A 0.7346 oz/1000 ftsquared Sq. centimeters 0.001076 Sq. feet Sq. centimeters 0.155 Sq. inches Sq. feet 929 Sq. centimeters Sq. feet 0.0929 Sq. meters Sq. feet 9.294 x 10 (-6) Hectares Sq. inch 6.452 Sq. centimeters Ton (2000 lbs) 907 kg Yards 91.44 Centimeters Yards 0.9144 Meters Yards 914.4 Millimeters yd (cubed) 27 ft (cubed) yd (cubed) 0.7645 m (cubed)

## Area Equivalents

1 acre = 43,560 ft squared = 4840 yd 2 = 0.4047 hectares = 160 rods squared = 4047 m 2 = 0.0016 sq. mile
1 acre-inch = 102.8 m 3 = 27,154 gal = 3630 ft 3
1 hectare (ha) = 10,000 m 2 = 100 are = 2.471 acres = 107,639 ft squared
1 cubic foot (ft 3 ) = 1728 in 3 = 0.037 yd 3 = 0.02832 m 3 = 28,320 cm 3
1 square foot (ft 2 ) = 144 in 2 = 929.03 cm 2 = 0.09290 m 2
1 square yard (yd 2 ) = 9 ft 2 = 0.836 m 2
1 cubic yard (yd 3 ) = 27 ft 3 = 0.765 m 3

 Units Sq. In. Sq. Ft. Sq Yd. Sq. cm Sq. m Sq. In. 1 0.006944 0.0007716 6.452 0.000645 Sq. Ft. 144 1 0.1111 929 0.0929 Sq Yd. 1296 9 1 8361 0.8361 Sq. cm 0.155 0.001076 0.0001196 1 0.0001 Sq. m 1550 10.76 1.196 10,000 1

## Liquid Equivalents

1 ft (cubed) 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) = 2.113 pts. = 1000 ml = 1.057 qts. = 33.8 fl.oz. = 0.26 gal
1 US gallon=4 qt.=8 pt. = 16 cups = 128 fl.oz. = 8.337 lbs of water = 3.785 L = 3785 ml = 231 in 3 = 256 tbsp. = 0.1337 ft3
1 quart = 0.9463 liters = 2 pt. = 32 fl. oz. = 4 cups = 64 tablespoons (tbsp.)=57.75 in 3 = 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. = = ½ pt. = 16 tablespoons = 236.6 ml
1 tablespoon = 14.8 ml = 3 teaspoons (tsp.) = 0.5 fl.oz.
1 milliliter (ml) = 1 cm 3 = 0.34 fl.oz. = 0.002 pts
1 teaspoon = 4.93 ml = 0.1667 fl. oz. = 80 drops
1 US fluid ounce = 29.57 ml = 2 tablespoons = 6 tsp. = 0.03125 qt

## Temperature Equivalents

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

 Units Dyne Lb. Newton Dyne 1 2.248x10-6 10-5 Lb. 444,823 1 4.448 Newton 100,000 0.2248 1

## 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

1 mg/g = 1000 ppm
1 fl.oz./gal = 7490 ppm
1 fl.oz./100 gal = 75 ppm
1 pt/100 gal = 1 teaspoons/1gal
1 qt/100 gal = 2 tablespoons/1 gal

## Flow

1 gpm = 0.134 ft 3 /minute
1 ft (cubed) /min. (cfm) = 449 gal/hr. (gph) = 7.481 gal/min.

## Weight Equivalents

1 ton (US) = 2000 lb = 0.907 metric tons = 907.2 kg
1 metric ton = 10 6 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 (mg) = 10 -6 grams = 0.001 mg
nanogram (ng) = 10 -9 grams = 0.001 micrograms (mg)
picogram = 10 -12 grams
1 ppm= 0.0001%= 0.013 fl oz in 100 gal =1 mg/kg=1 mg/L=1 mg/g= 0.379 g in 100 gal water= 8.34 x 10 -6 lb/gal=1ml/l
10 ppm = 0.001% = 10 mg/L 100 ppm = 0.01% = 100 mg/L1000 ppm = 1mg/g = 0.1% = 1000 mg/L
1 ppb = 1 ug/kg or 1 ug/L or 1 ng/g
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  Mid-States     HQ: 1716 Guinotte Avenue, Kansas City, Missouri 64120, US :: 800.825.1410