HOW DO I CALIBRATE A HOSEEND SPRAYER? (For Spraying Plants)
1. Select a single plant or a group of plants (e.g., a tree, a 20foot row of vegetable plants, or a 100 ft^{2} flower bed).

one 10foot apple tree 

2. Do not add pesticide to the water used in this step because you are merely trying to determine how long it takes to treat the designated plant(s). Using plain water in your hoseend sprayer, spray the plant(s) designated in Step 1 until all of the leaves, stems, and trunks are completely covered. Record how much time it takes. Note: Many product labels instruct you to spray until runoff, i.e., until the spray material begins to drip off the leaves.
However, it is better to stop just before that point is reached because the material that drips onto the ground is wasted. 
35 seconds required to treat the 10foot apple tree 
3. Spray water into a bucket for the amount of time determined in Step 2.
Measure and record the amount of water collected in the bucket. 
2 qt water collected in 35 seconds 

4. Determine the total number of plants or overall size of the planting that will be treated (e.g., 6 trees or a 100ft row of vegetables). 
6 apple trees will be treated 
5. Multiply the number of plants or length of the overall planting from Step
4 by the amount of water collected in Step 3. This will determine the total amount of water required for the job. 
6 trees x 2 qt water/tree = 12 qt
12 qt ÷ 4 qt/ gal = 3 gal water required for the job

HOW DO I CALIBRATE A HOSEEND SPRAYER? (For Spraying Turf)
Calibration Steps 
Sample Problem 
1. Attach the hoseend sprayer (container empty) to the hose and open the water faucet fully


2. Spray the test area with plain water and record the amount of time it takes to cover the test area while walking at a comfortable, consistent speed.

20 seconds to walk and cover 250 ft^{2} 
3. Using the hoseend sprayer, spray plain water into a bucket for the time recorded in Step 2, then measure the amount of water collected.

1.25 gal of water collected in 20 seconds

4. Divide the total area to be treated by the area covered in Step 2. Multiply the result by the number of gallons collected in Step 3 to determine the total gallons of water that would be applied to a 1000 squarefoot lawn at your walking speed 
1000 ft^{2} ÷ 250 ft^{2 }= 4
4 x 1.25 gal = 5 gal of water

5. Check the product label for the required amount of water per 1000 square feet (this is not always provided) and compare it to the amount obtained in Step 4. In this example, the label said to use 24 gallons of water per 1000 square feet.

5 gallons of water will be too much based on the label requirement 
6. Recalibrate your sprayer by walking over the test area somewhat faster than in Step 2, and premeasured the amount of water as in Step 3 
During the second test, you walked the 250 ft^{2}test area in 15 seconds and sprayed 0.75 gal of water into a bucket.
For 1000 ft^{2}; 4 x 0.75 gal =3 gal/1000 ft^{2}

7a. Compute the amount of water that will be required to treat the lawn by first dividing its total area by 1000 square feet.
7b. Multiply the amount of water required per 1000 sq ft times the number in 7a

6300 ft^{2} ÷1000 ft2= 6.3
3 gal/1000 ft^{2}x 6.3 = 18.9 gal required

8. Compute the amount of product needed to treat the lawn by multiplying the amount of product required per 1000 sq ft times the number in 7a.

4 oz/1000 ft^{2}x 6.3 =
25.2 oz of product needed (round off to 25 oz) 