1 fluid ounce = 1.04 ounces (avoirdupois) = 29.5 ml
1 ounce (avoirdupois) = 28.35 grams
1 lb = 16.0 ounces (avoirdupois) = 454 grams
1 gallon = 4 quarts = 8 pints = 16 cups = 128 fluid ounces
1 gallon = 231 cu in= 8.33 lbs (pure water weight) = 3.79 liters
Note: 1 English (Imperial gallon) = 1.2 U.S. gallons
1 quart = 2 pints = 4 cups = 32 ounces = .945 liters
1 pint = 16 ounces = 2 cups
1 cup = 8 ounces = 16 tablespoons = 236 ml
1 tablespoon = 3 teaspoons
1 teaspoon = 5 ml = 110 drops (depends on dropper)
1 gallon/hr = 3.82 cu in/min
1 gallon/minute = 60 gallons/hour
1 gallon/second = 60 gallons/min = 3600 gallons/hour
1 ton = 2000 pounds = 240 gallons of water
1 pound per hundred gallons = 1200 ppm = 1.20 ppt = 0.120 %
1 foot = 12.0 inches = 0.305 meters
1 yard = 3.00 feet = 36.0 inches = .914 meters
1 mile = 5280 feet = 1.61 kilometers
1 acre = 4356 square feet
1 cu in = 0.00433 gal = .0164 liters = 16.4 ml
1 cu ft = 1728 cu in = 7.48 gal = 28.3 liters
1 liter (l) = 1000 milliliters (ml) = 0.001 cu meters = 0.264 gal = 61.0 cu in
1 liter/hr = 1.02 cu in/min
1 meter = 100 centimeters = 3.28 feet = 39.4 inches = 1.09 yards
1 centimeter = 10 millimeters
1 micron = 0.000001 meters = .0001 centimeter
1 kilometer = 1000 meters = 0.621 miles
1 ml water = 1 gram = 1 cubic centimeter
1 kilogram (kg) = 1000 grams (g) = 1000000 milligrams (mg) = 2.20 lb
1 percent (%) = 10 parts per thousand (ppt) = 10000 parts per million (ppm)
1 ppm = 1 mg/l = 1 pound per 120,000 gallons = 1 ounce per 7500 gallons
1 minute = 60 seconds
1 hour = 60 minutes = 3600 seconds

Temperature Fahrenheit <=> Centigrade
^OF = 9/5 ^OC + 32
^OC = (^OF - 32) 5/9