Weights and Measures
Liquid
1 mililiter (ml) = 1 cubic centimeter (cc)
1 teaspoon (tsp) = 5 milliliter (ml)
3 teaspoons (tsp) = 1 tablespoon (Tbsp)
1 tablespoon (Tbsp) = 15 milliliter (ml)
2 tablespoons (Tbsp) = 1 ounces (oz)
16 tablespoons (Tbsp) = 1 cup (c.)
1 cup (c.) = 8 ounces (oz)
2 cups (c.) = 1 pint (pt)
1 pint (pt) = 16 ounces (oz)
2 pints (pt) = 1 quart (qt)
8 pints (pt) = 1 gallon (gal)
1 gallon (gal) = 128 ounces (oz)
1 gallon (gal) = 3785 mililiters (ml)
Weight
1 ounce (oz) = 28.4 grams (gm)
16 ounces (oz) = 1 pound (lb)
1 pound (lb) = 454 grams (gm)
1 kilogram (kg) = 2.2 pounds (lbs)
Length and Area
1 mile (mi) = 5,280 feet (ft)
1 mile (mi) = 320 rods
1 rod = 16.5 feet (ft)
1 mile (mi) = 1.6 kilometers (K)
1 acre (A) = 43,560 square feet (sq ft)
1 square rod (sq rod) = 272.3 square feet (sq ft)
1 acre (A) = 160 square rods (sq rod)
Pints of Commercial Material Needed Per Acre
for given amounts of active ingredient (ai)
lb ai/gal of commercial material 
Recommended rate in pounds of active ingredient per acre (lbs of ai/A) 

0.25 
0.5 
0.75 
1.0 
1.5 
2.0 

Pints of commercial material per acre 

1.00 
2 
4 
6 
8 
12 
16 
2.00 
1 
2 
3 
4 
6 
8 
2.64 
0.75 
1.5 
2.25 
3 
4.5 
6 
3.00 
0.7 
1.33 
2 
2.7 
4 
5.33 
3.34 
0.6 
1.2 
1.8 
2.4 
3.6 
4.8 
4.00 
0.5 
1 
1.5 
2 
3 
4 
5.00 
0.4 
0.8 
1.2 
1.6 
2.4 
3.2 
6.00 
0.33 
0.7 
1 
1.33 
2 
2.7 
6.70 
0.3 
0.6 
0.9 
1.2 
1.8 
2.4 
7.00 
0.29 
0.57 
0.87 
1.14 
1.7 
2.3 
8.00 
0.25 
0.5 
0.75 
1.0 
1.5 
2.0 
Amount of Chemical Needed
for 1 sq rod and 1,000 sq ft
Applied at the rate of 1 lb of ai/A
Liquid 

lb ai/gal 
milliliters (ml) 

per sq rod 
per 1,000 sq ft 

0.67 
35 
130 
1.00 
24 
87 
1.50 
16 
58 
2.00 
12 
43 
2.50 
10 
35 
3.00 
8 
29 
3.34 
7 
26 
4.00 
6 
22 
6.00 
4 
14 
7.00 
3.5 
12 
Dry 

percent (%) ai 
grams (g) 

per sq rod 
per 1,000 sq ft 

100 
2.8 
10 
90 
3.1 
12 
80 
3.5 
13 
75 
3.8 
14 
70 
4.0 
15 
65 
4.4 
16 
60 
4.7 
17 
50 
5.6 
21 
40 
7.0 
26 
30 
9.4 
35 
20 
14.1 
52 
10 
28.3 
104 
5 
56.6 
208 
4 
71.0 
261 
3 
94.6 
347 
2 
142.0 
521 
1 
284.0 
1,042 
How to Determine the Amount of Herbicide Needed
If rate is recommended for
Liquid commercial product:
Rate of product/acre x acres treated = total volume
Example: 1.5 pt/A x 20 A = 30 pt product
30 pt ÷ 8 pt/gal = 3.75 gal product
If rate is recommended as
Active ingredient (ai) for liquid product:
Rate of ai/A ÷ lb ai/gal product = gal product/A
Gal product/A x A treated = total gallons product
Example: 0.5 lb ai ÷ 4 lb ai/gal = 0.125 gal/A
0.125 gal/A x 20 A = 2.5 gal product
If rate is recommended for
A dry commercial product:
Rate of product/A x A treated = total weight
Example: 15 lb/A x 50 A = 750 lb product
If rate is recommended as
Active ingredient (ai) for a dry product
Rate of ai/A ÷ lb ai/lb product = lb product/A
lb product/A x acres = total weight
Example: 2 lb ai/A ÷ 0.8 lb ai/lb product = 2.5 lb product/A
2.5 lb/A x 30 A = 75 lb product
Method for Applying Correct Amount of Spray Solution per Acre
To determine the spray volume of a hydraulic sprayer, use the following shortcut calibration formulas. 

1. Determine application speed in miles per hour (mph) 
mph = (feet traveled ÷ time in seconds) x 0.6818 

2. Determine nozzle output in gallons/minute (gal/min) 
gal/min = ounces collected ÷ (2.13 x seconds) 

3. Determine sprayer output in gallons/acre (gal/A) 
gal/A = [(5,940 x gal/min per nozzle) ÷ (nozzle spacing in inches x mph)] 

* Based on 2,4 D formulation with a 4 lb acid equivalent (ae)/gal 

Teaspoon Volume Equivalents To prepare one gallon of spray solution (using standard kitchen measuring spoons, level measure) 

Chemical 
Rate per Acre 
Volume water per Acre 
Tablespoons of chemical for 
2,4 D amine * 
3 pint (1.5 lb) 
50 gallons 
2.0 
2,4 D amine * 
1 pint (0.5 lb) 
10 gallons 
3.2 
2,4 D lowvolatile ester * 
3 pint (1.5 lb) 
50 gallons 
2.0 
2.4 D lowvolatile ester * 
1 pint (0.5 lb) 
10 gallons 
3.2 
glyphosate 
2 quart (1.5 lb) 
50 gallons 
2.6 
naptalam 
2 gallons (4.0 lb) 
50 gallons 
10.2 