Cubic Measure
1,728 Cubic Inches      =          1 Cubic Foot
27 Cubic Feet              =          1 Cubic Yard

Linear Measure
12 Inches                     =          1 Foot
3 Feet                          =          1 Yard

16 ½ Feet or
5 ½ Yards                    =          1 Rod

660 Feet
220 Yards or
40 Rods                       =          1 Furlong

5,280 Feet
1,760 Yards
320 Rods or
8 Furlongs                    =          1 Mile

Dry Measure
50-60 Drops                =          1 Level Teaspoon
3 Level Teaspoons       =          1 Level Tablespoon
2 Level Tablespoons     =          1 Fluid Ounce
8 Fluid Ounces             =          1 Cup
2 Cups (4 Gills)            =          1 Pint
2 Pints                          =          1 Quart
4 Quarts                       =          1 Gallon
31 ½ Gallons                =          1 Barrel

Square Measure
144 Square Inches        =          1 Square Foot
9 Square Feet               =          1 Square Yard
30 Square Yards          =          1 Square Rod

43,560 Square Feet
4,840 Square Yards Or
160 Square Rods         =         1 Acre

 640 Acres                    =          1 Square Mile

Volume
1 Gallon (U.S.)             =          128 Fluid Ounces (U.S.)
                                    =          231 Cubic Inches
                                    =          0.833

 Liquid Measure
50-60 Drops                =          1 Teaspoonful
3 Teaspoonful*             =          1 Tablespoonful
2 Tablespoonful*          =          1 Fluid Ounce
8 Fluid Ounces             =          1 Cupful
2 Cupfuls (4 Gills)         =          1 Pint
2 Pints                          =          1 Quart
4 Quarts                       =          1 Gallon
31 ½ Gallons                =          1 Barrel

*Level Spoonfuls

The following table can be used to mix different amounts of a spray of the same mixture when using wettable powers.

Example:  If the label specifies that 3 lbs. of a wettable powder pestidie material are to be added to 100 gallons of water, then 1.5 T. of the pesticide material would make 1 gallon of similar spray mixture.

(The above measurements of WP are acceptable for practical purposes.)

Tablespoon measurements will vary depending on the weight of the soluble powder.  Tablespoons are really not intended for weight measurements and are offered solely as a convenience to the user.  Different amounts of similar spray can be made from the following table, when liquid pesticide material (emulsifiable concentrates or EC) are used.  When reducing the amount of spray mixture, be sure to stay in the right column and line as indicated above.

The above tables are strictly based on information that should be found on the label of the particular pesticide that will be used.

For amounts of spray not listed, the tables above can be halved, doubled or by adding combinations as needed.

Key for teaspoons and tablespoons:
T. = Tablespoons
t. = Teaspoons

The first step in calibrating spraying, dusting or granulating equipment is to read the entire label of the pesticide you are about to use.  Then decide on the dosage listed on the label that fits the needs for controlling that particular pest.  Next follow this check list:

   1.    Select nozzles to provide the proper application rate within the recommended range of pressures.
   2.    Adjust nozzles so that the coverage is uniform.
   3.    Regulate the pressure to give proper nozzle discharge rate and spray pattterns.
   4    Regulate and maintain ground speed for applying the correct amount of pesticide.
   5.    Prepare to calibrate equipment correctly.

Calibration of Hand Sprayers (Single Nozzle).
   1.    Mark off an area 10 feet by 10 feet.
   2.    Fill sprayer with water to known mark and spray area.
   3.    Refill sprayer, measuring the amount of water required to refill to original level.
   4.    Determine per acre rate of spray delivery from:

Example: To determine rate for wettable powder in hand sprayer when using package directions that call for making large amounts of diluted finish spray note this example.  If the package says to add 2 pounds of soluble concentrate to 55 gallons of water and your back pack sprayer holds only 3 gallons of water, you must first convert the pounds to ounces.  In this case 2 pounds = 32 dry ounces.  Multiply the 32 ounces by the capacity of the back pack sprayer, which in this case is 3 gallons.  Next, multiply that answer by the 55 gallons and you will have your ounces in dry ounces.  32 times 3 divided by 55 = 1.745 ounces of dry concentrate needed for the three gallon sprayer.

2 lbs     x    55 gallons            x            3 gallon sprayer
32 oz.   x    3                        x                    55            =    1.7 oz. dry in 3 gallons of water

Formula:         (lbs. insecticide used) x (% active ingredient)
                           (gallons of spray mixture) x (8.3)

Example: Eight pounds of Captan 50 percent wettable powder were mixed in 100 gallons of water.  What percentage of Captan did the finished spray contain?

                    8 x 50        =        0.48% Captan
                  100 x 8.3

2.    To determine the pounds of wettable powder needed to mix a spray contain a given percentage of active ingredients:

Formula:        (gallons of spray wanted) x (% active ingredient wanted) x (8.3 lbs.)
                                        (% active ingredient in insecticide used)

Example: Start with the gallons of finished diluted spray you wish to make and multiply it by the percentage of active ingredient you wish the finished spray to have.  Take that number and multiply it by the weight of 1 gallon of water (8.3 lbs.), then divide that number by the percentage of active ingredient listed on the dry concentrate package.

Example: How many pounds of Lindane 25 percent wettable powder are needed to make 100 gallons of spray containing 0.03 percent Lindane?

                100 x 0.03 x 8.3        =        1.0 lb.
                            25

3.     To determine the gallons of emulsifiable concentrate needed to mix a spray containing a given percentage of active ingredient:

Formula:        (gallons of spray wanted) x (% active ingredient wanted) x (8.3 lbs)
                                (lbs. active ingredient per gallon of concentrate) x (100)

Example: How many gallons of 25 percent emulsifiable concentrate (2 pounds per gallon) are needed to make 100 gallons of spray containing 0.25 percent insecticide?

                100 x 0.25 x 8.3          =        1.04 gallons
                        2 x 100