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# Metric System Conversion Factors1

J. Bryan Unruh, Barry J. Brecke, and Ramon G. Leon-Gonzalez 2

## Area Equivalents

### 1 Acre (A)

= 43,560 square feet (ft2)

= 4,840 square yards (yd2)

= 0.405 hectares (ha)

= 160 square rods (rd2)

= 4,047 square meters (m2)

### 1 Acre-inch (ac-in)

= 102.8 cubic meters (m3)

= 27,154 gallons, US (gal)

= 3,630 cubic feet (ft3)

### 1 Are (a)

= 100 square meters (m2)

= 119.6 square yards (yd2)

= 0.025 acre (A)

### 1 Cubic Foot (ft3)

= 1,728 cubic inches (in3)

= 0.037 cubic yards (yds3)

= 0.02832 cubic meters (cm3)

= 28,320 cubic centimeters (cm3)

### 1 Cubic Yard (yd3)

= 27 cubic feet (ft3)

= 0.764 cubic meters (m3)

### 1 Hectare (ha)

= 10,000 square meters (m2)

= 100 are (a)

= 2.471 acres (A)

### 1 Square Foot (ft2)

= 144 square inches (in2)

= 929.03 square centimeters (cm2)

= 0.0929 square meters (m2)

### 1 Square Mile (mi2)

= 27,878,400 square feet (ft2)

= 3,097,600 square yards (yd2)

= 640 square acres (A2)

= 2,589,988.11 square meters (m2)

### 1 Square Rod (rd2)

= 39,204 square inches (in2)

= 272.25 square feet (ft2)

= 30.25 square yards (yds2)

= 25.3 square meters (m2)

### 1 Square Yard (yd2)

= 9 square feet (ft2)

= 0.836 square meters (m2)

## Flow Equivalents

### 1 Gallon Per Minute (GPM, gal/min)

= 0.134 cubic feet/minute (CFMft3/min)

### 1 Cubic Foot Per Minute (CFM, ft3/min)

= 449 gallons per hour (GPH)

= 7.481 gallons per minute (GPM)

## Length Equivalents

### 1 Centimeter (cm)

= 0.3937 inch (in)

= 0.01 meter (m)

= 0.03281 foot (ft)

### 1 Chain, Gunter's or Surveyor's (ch)

= 792 inches (in)

= 66 feet (ft)

= 22 yards (yd)

= 4 rods (rd)

= 0.0125 miles (mi)

= 2011.68 centimeters (cm)

= 20.116 meters (m)

### 1 Foot (ft)

= 12 inches (in)

= 30.48 centimeters (cm)

= 0.3048 meters (m)

### 1 Inch (in)

= 0.08333 foot (ft)

= 25.4 millimeters (mm)

= 2.54 centimeters (cm)

= 0.0254 meters (m)

### 1 Kilometer (km)

= 39,370 inches (in)

= 3,281 feet (ft)

= 0.621 U.S. statute mile (mi)

= 100,000 centimeters (cm)

= 1,000 meters (m)

### 1 Meter (m)

= 39.4 inches (in)

= 3.28 feet (ft)

= 1.094 yards (yd)

= 1000 millimeters (mm)

= 100 centimeters (cm)

### 1 Micrometer (micron, µm)

= 0.001 millimeters (mm)

= 1 x 10-3 millimeters (mm)

### 1 Rod (rd)

= 198 inches (in)

= 16½ feet (ft)

= 5½ yards (yd)

= ¼ chain (ch)

= 502.92 centimeters (cm)

= 5.03 meters (m)

### 1 Statute Mile (mi)

= 5,280 feet (ft)

= 1,760 yards (yd)

= 1,609 meters (m)

= 1.61 kilometers (km)

### 1 Yard (yd)

= 36 inches (in)

= 3 feet (ft)

= 0.9144 meters (m)

## Liquid Equivalents

### 1 Acre-inch of Water (ac in)

= 27,154 gallons (gal)

= 3,630 cubic feet (ft3)

### 1 Cubic Foot of Water (ft3)

= 7.48 gallons, US (gal)

= 62.4 pounds, US (lb, #)

= 28.3 liters (L)

### 1 Cup, measuring (c)

= 8 fluid ounces (fl. oz.)

= ½ pint (pt)

= 16 tablespoons (tbsp)

= 236.6 milliliters (ml)

### 1 Fluid Ounce, US (fl. oz.)

= 6 teaspoons (tsp)

= 2 tablespoons (tbsp)

= 29.57 milliliters (ml)

### 1 Gallon, US (gal)

= 4 quarts (qt)

= 8 liquid pints (pt)

= 16 cups (c)

= 256 tablespoons (tbsp)

= 128 fluid ounces, US (fl. oz.)

= 8.337 pounds, US (lb, #) of water

= 3.785 liters (L)

= 3,785 milliliters (ml)

= 0.1337 cubic foot (ft3)

= 231 cubic inches (in3)

= 0.8333 Imperial gallon

### 1 Liquid Pint, US (pt)

= 2 cups (c)

= 32 tablespoons (tbsp)

= 16 fluid ounces, US (fl. oz.)

= 473.2 milliliters (ml)

### 1 Liquid Quart, US (qt)

= 2 liquid pints, US (pt)

= 4 cups (c)

= 64 tablespoons (tbsp)

= 32 fluid ounces, US (fl. oz.)

= 57.75 cubic inches (in3)

= 0.9463 liters (L)

### 1 Liter (L)

= 1,000 milliliters (ml)

= 33.8 fluid ounces, US (fl. oz.)

= 2.1 liquid pints, US (pt)

= 1.057 liquid quarts, US (qt)

= 0.26 gallons, US (gal)

### 1 Milliliter (mL)

= 1 cubic centimeter (cm3)

= 0.034 fluid ounces, US (fl. oz.)

= 0.002 liquid pint, US (pt)

### 1 Tablespoon (tbsp)

= 3 teaspoons (tsp)

= 14.8 milliliters (ml)

= ½ fluid ounces, US (fl. oz.)

### 1 Teaspoon (tsp)

= 80 drops

= 0.1667 fluid ounces, US (fl.oz.)

= 4.93 milliliters (ml)

### Mixture Proportions

1 pint/100 gallons = 1 teaspoon/1 gallon

1 quart/100 gallons = 2 tablespoons/1 gallon

### Pressure Equivalents

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

## Temperature Equivalents

### Convert degrees Centigrade (°C) to degrees Fahrenheit (°F)

degrees CentigradeC) = (°F - 32) x 5/9

### Convert degrees Fahrenheit (°F) to degrees Centigrade (°C)

degrees Fahrenheit F) = (°C x 9/5) + 32

## Weight Equivalents

### 1 Ton, US, short or net

= 2,000 pounds, US (lb, #)

= 0.907 metric tons

= 907.2 kilograms (kg)

### 1 Metric Ton

= 1,000 kilograms (kg)

= 106 (1 million) grams (g)

= 2,205 pounds, US (lb, #)

### 1 Pound, US (lb, #)

= 16 ounces, weight (oz.)

= 7,000 grains

about 1 liquid pint (pt)

= 453.6 grams (g)

= 0.4536 kilograms (kg)

### 1 Ounce, weight (oz.)

= 28.35 grams (g)

### 1 Kilogram (kg)

= 1,000 grams (g)

= 35.3 ounces, weight (oz.)

= 2.205 pounds, US (lb, #)

### 1 Gram (g)

= 1,000 milligrams (mg)

= 0.001 kilograms (kg)

= 0.035 ounces, weight (oz.)

= 0.0022 pounds, US (lb, #)

### 1 Milligram (mg)

= 0.001 grams (g)

= 10-3 grams (thousandth)

### 1 Microgram (µg)

= 0.001 milligrams (mg)

= 10-6 grams (millionth)

### 1 Nanogram (ng)

= 0.001 micrograms (µg)

= 10-9 grams (billionth)

### 1 Picogram (pg)

= 10-12 grams (trillionth)

### 1 Part Per Billion (ppb)

= 1 nanogram per gram (ng/g)

= 1 microgram per kilogram (µg)/kg)

= 1 microgram per liter (µg/L)

### 1 Part Per Million (ppm)

= 1 milligram per liter (mg/L)

= 1 milligram per kilogram (mg/kg)

= 1 microgram per gram (µg/g)

= 0.0001 percent (%)

= 0.013 fluid ounces per 100 gallon water

### 1 Part Per Trillion (ppt)

= 1 picogram per gram (pg/g)

### 1 Percent (%)

= 10,000 parts per million (ppm)

= 10 grams per liter (g/L)

= 1.33 ounces (oz.) by weight per 1 gallon water

= 8.34 pounds (lb, #) per 100 gallons water

### Mixture Ratios

1 milligram per gram (mg/g) = 1,000 parts per million (ppm)

1 fluid ounce, US per 1 gallon, US (1 fl. oz./1 gal) = 7,490 parts per million (ppm)

1 fluid ounce, US per 100 gallons, US (1 fl. oz./100 gal) = 75 parts per million (ppm)

10% = 6° = 10:1

18% = 10° = 6:1

25% = 14° = 4:1

33% = 18° = 3:1

50% = 26° = 2:1

100% = 45° = 1:1

### Tables

Table 1.

Metric prefix definitions, multiples, and equivalents.

 PREFIX MULTIPLE EQUIVALENT tera - 1012 trillionfold giga - 109 billionfold mega - 106 millionfold kilo - 103 thousandfold hecto - 102 hundredfold deca - 101 tenfold PREFIX SUBMULTIPLE EQUIVALENT deci - 10-1 tenth centi - 10-2 hundredth milli - 10-3 thousandth micro - 10-6 millionth nano - 10-9 billionth pico - 10-12 trillionth Note: basic metric unit = 1
Table 2.

Conversion factors.

 TO CONVERT MULTIPLY BY TO OBTAIN Acres 43,560 Square Feet (ft2) Acres 0.00405 Square Kilometer (km2) Acres 4050 Square Meter (m2) Acres 4840 Square Yards (yd2) Acre-Feet 324,851 Square Feet (ft2) Acre-Feet 43,560 Cubic Feet (ft3) Acre-Feet 1233.5 Cubic Meters (m3) Bar 14.5 Pounds Per Square Inch (psi, lb/sq.in., #/in2) Bar 1019.7 Grams Per Cubic Centimeters (g/cm3) Bar 29.53 Inches of Mercury at Zero Degrees Centigrade (in hg @ o¡c) Centimeters (cm) 0.03281 Feet (ft) Centimeters 0.3937 Inches (in) Centimeters 0.1094 Yards (yd) Centimeters 0.01 Meters (m) Centimeters 10 Millimeters (MM) Centimeters Per Second (cm/sec) 1.9685 Feet Per Minute (ft/min) Centimeters Per Second (cm/sec) 0.0223694 Miles Per Hour (mph) Cubic Centimeters (cm3) 0.0610237 Cubic Inches (in3) Cubic Feet (ft3) 0.0283 Cubic Meter (m3) Cubic Feet 7.4805 Gallons (gal) Cubic Feet 1728 Cubic Inches (in3) Cup 8 Fluid Ounces (fl oz.) Feet (ft) 30.48 Centimeters (cm) Feet 0.3048 Meters(m) Foot Candle 10.764 Lux Gallons (gal) 3.785 Liters (l) Gallons 3,785 Milliliters (ml) Gallons 128 Ounces, Liquid (fl oz.) gal/Acre (GPA) 9.354 Liters/Hectare (l/ha) gal/1000 ft2 4.0746 Liters/100 Square Meters (l/100m3) GAL/Minute (gpm) 2.228 X 10-3 Cubic Feet/Second (ft3/sec) Grams (g) 0.002205 Pounds, US (lbs, #) Grams 0.0235274 Ounces, US Weight (oz.) Grams Per Liter (g/l) 1,000 ppm Grams Per LITER (g/l) 10 Percent (%) Grams/Square Meter (g/m2) 0.00020481 Pounds Per Square Feet (lb/sq ft, #/ft2) Grams Per Cubic Meter (g/cm3) 0.036127 Pounds Per Cubic Inch (lb/in3) Grams Per Cubic Meter (g/cm3) 62.428 Pounds Per Cubic Foot (lb/ft3) Hectares (ha) 2.471 Acres (A) Inches 2.540 Centimeters (cm) Inches 0.0254 Meters (m) Inches 25.40 Millimeters (mm) Square Inches (in2) 6.4516 Square Centimeters (cm2) Cubic Inches (in3) 16.3871 Cubic Centimeters (cm3) Kilograms (kg) 2.2046 Pounds, US (lbs, #) Kilograms/Hectare (kg/ha) 0.892 Pounds/Acre Kilograms/Hectare (kg/ha) 0.02048 Pounds Per 1000 Square Feet (lb/1000 ft2) Kilogram Per Liter (kg/l) 8.3454 Pounds Per Gallon (lb/gal) Kilometers (km) 100,000 Centimeters (cm) Kilometers 3,281 Feet (ft) Kilometers 1,000 Meters (m) Kilometers 0.6214 Miles (mi) Kilometers 1,094 Yards (yd) Kilometers Per Hour (km/h) 0.62137 Miles Per Hour (mph) Kilometers Per Hour (km/h) 54.6807 Feet Per Minute Liters (l) 0.2642 Gallons (gal) Liters 2.113 Pints (pt) Liters 1.057 Quarts (qt) Liters/Acre 0.107 Gallons/Acre Liters/100 Square Meters (l/100 m2) 0.2454 Gallons/1000 Square Feet (gal/1000ft2) Liters/Hectare (l/ha) 0.107 Gallons Per Acre Meters (m) 3.281 Feet (ft) Meters 39.37 Inches (in) Meters 1.094 Yards (yd) Meters 100 Centimeters (cm) Meters 0.001 Kilometers (km) Meters 1,000 Millimeters (mm) Meters Per Second (m/sec) 2.2369 Miles Per Hour (mph) Square Meters (m2) 10.764 Square Feet (ft2) Cubic Meters (m3) 35.3147 Cubic Feet (ft3) Cubic Meters (m3) 1.30795 Cubic Yards (yd3) Miles (mi) 160,900 Centimeters (cm) Miles 5280 Feet (ft) Miles 1.609 Kilometers (km) Miles 1760 Yards (yd) Miles/Hour (mph) 1.467 Feet/Second (ft/sec) Miles/Hour 88 Feet/Minute (ft/min) Miles/Hour 1.61 Kilometers/Hour (km/hr) Miles/Hour 0.447 Meter/Second (m/sec) Milliliters (ml) 0.0338 Ounces, Fluid (fl oz.) Millimeters (mm) 0.03937 Inches (in) Ounces, Fluid (fl. oz.) 0.02957 Liters (l) Ounces, Fluid (fl. oz.) 29.573 Milliliters (ml) Ounces, US, Weight (oz.) 28.35 Grams (gm) Parts Per Million (ppm) 2.719 Pounds of Active Ingredient (lb ai)/Acre-foot of Water PPM 0.001 Grams/Liter (gm/l) PPM 8.34 Pounds/Million gal (lb/Mgal) PPM 1 Milligrams/Kilograms (mg/kg) PPM 0.013 Ounces/100 gal of Water PPM 0.3295 Gallons/Acre-foot of Water PPM 8.345 Pounds/Million gal of Water Percent (%) 10 Grams/Kilograms (g/kg) Pint, Liquid (pt.) 0.473 Liter (l) Pint Per Acre (pt/a) 1.1692 Liter Per Hectare (l/ha) Pounds, US (lb, #) 0.4536 Kilograms (kg) Pounds 453.6 Grams (g) Pounds/Acre 1.12 Kilograms/Hectare (km/ha) Pounds/Acre (lb/a) 0.02296 Pounds Per 1000 Square Feet (lb/1000 ft2) Pounds/Square Feet (lb/ft2) 4883 Grams/Square meter (gm/m2) Pounds/Gallon 0.12 Kilogram/Liter (kg/l) PSI; Pounds Per Square Inch (lbs/in2) 6.9 Kilopascals (kPa) PSI 0.06895 Bar PSI 0.062046 Atmosphere (atm) Quarts, Liquid (qt) 0.9463 Liters (l) Quarts Per Acre (qt/a) 2.3385 Liters Per Hectare (l/ha) Square Centimeters (cm2) 0.001076 Square Feet (ft2) Square Centimeters 0.1550 Square inches (in2) Square Feet (ft2) 929 Square Centimeters (cm2) Square Feet 0.0929 Square Meters (m2) Square Feet 9.294 X 10-6 Hectares (ha) Square Inch 6.452 Square Centimeters (cm2) Ton (2000 lbs) 907 Kilograms (kg) Yards (yd) 91.44 Centimeters (cm) Yards 0.9144 Meters (m) Yards 914.4 Millimeters (mm) Cubic yards (Yd3) 0.7645 Cubic Meters (m3) Phosphoric Acid (P2O5) 0.437 Phosphorus (P) Potassium Oxide (K2O) 0.830 Potassium (K) Calcium Oxide (CaO) 0.715 Calcium (Ca) Magnesium Oxide (MgO) 0.602 Magnesium (Mg)
Table 3.

Decimal and millimeter length equivalents.

 FRACTION (inch) = DECIMALS (inch) = MILLIMETERS 1 1.00 25.4 15/16 0.9375 23.812 7/8 0.875 22.225 13/16 0.8125 20.638 3/4 0.75 19.05 11/16 0.6875 17.462 5/8 0.625 15.875 9/16 0.5625 14.288 1/2 0.5 12.70 7/16 0.4375 11.112 3/8 0.3750 9.525 11/32 0.34375 8.731 5/16 0.3125 7.938 9/32 0.28125 7.144 1/4 0.25 6.350 15/64 0.234375 5.953 7/32 0.21875 5.556 13/64 0.203125 5.159 3/16 0.1875 4.762 11/64 0.171875 4.366 5/32 0.15625 3.969 9/64 0.140625 3.572 1/8 0.1250 3.175 7/64 0.109375 2.778 3/32 0.09375 2.381 5/64 0.078125 1.984 1/16 0.0625 1.588 3/64 0.046875 1.191 1/32 0.03125 0.794 1/64 0.015625 0.397

### Footnotes

1. This document is AGR39, one of a series of the Environmental Horticulture Department, UF/IFAS Extension. Original publication date November 1993. Revised August 2006 and December 2014. Reviewed December 2017. Visit the EDIS website at https://edis.ifas.ufl.edu.
2. J. Bryan Unruh, associate center director and professor, Environmental Horticulture Department; Barry J. Brecke, adjunct professor, Agronomy Department; and Ramon G. Leon-Gonzalez, Agronomy Department, UF/IFAS West Florida Research and Education Center; UF/IFAS Extension, Gainesville, FL 32611.

### Publication #AGR39

Date: 2018-01-31
Unruh, Joseph Bryan
Brecke, Barry J
Environmental Horticulture

### Related Topics • Joseph Unruh