# Conversion Factors for the National Swine Nutrition Guide

Several methods exist for expressing units of weight, concentration and volume in swine nutrition. The objective of this factsheet is to show how to perform unit conversions for weight (Table 1), concentration (Table 2) and volume (Table 3).

For example, assume a diet you are evaluating contains 75 mg/lb of iron. You want to know the iron concentration in ppm. Find the line in Table 2 that indicates “mg/lb to ppm (line 17). The conversion factor is 2.2. Multiply 2.2 by 75. The diet contains 165 ppm of iron.

Table 1. Weight conversion factorsa
Line no. To convert: Multiply by:
1 g to mg 1,000
2 mg to g 0.001
3 g to μg 1,000,000
4 μg to g 0.000001
5 kg to g 1,000
6 g to kg 0.001
7 kg to mg 1,000,000
8 mg to kg 0.000001
9 kg to lb 2.2046
10 lb to kg 0.4536
11 lb to g 453.6
12 g to lb 0.0022
13 mg to μg 1,000
14 μg to mg 0.001

ag = gram; mg = milligram; μg = microgram; kg = kilogram; lb = pound.

Table 2. Concentration conversion factorsa
Line no. To convert: Multiply by:
1 g/lb to % 0.220
2 % to g/lb 4.536
3 g/tonb to ppm 1.102
4 ppm to g/ton 0.907
5 Mcal/lb to kcal/lb 1,000
6 kcal to Mcal 0.001
7 Mcal to MJ 4.184
8 MJ to Mcal 0.239
9 mg/g to mg/lb 453.6
10 mg/lb to mg/g 0.0022
11 mg/g to ppm 1,000
12 ppm to mg/g 0.001
13 mg/kg to % 0.0001
14 % to mg/kg 10,000
15 mg/kg to ppm 1
16 ppm to mg/kg 1
17 mg/lb to ppm 2.2
18 ppm to mg/lb 0.4536
19 mg/lb to g/ton 2
20 g/ton to mg/lb 0.5
21 ppm to % 0.0001
22 % to ppm 10,000
23 μg/g to mg/g 0.001
24 mg/g to μg/g 1000
25 % to lb/ton 20
26 lb/ton to % 0.05

ag = gram; lb = pound; % = percent; ppm = parts per million; Mcal = Megacalorie; kcal = kilo- calorie; MJ = megajoule; mg = milligram; kg = kilogram; μg = microgram.

bOne ton = 2000 lb.

Table 3. Volume (fluid) conversion factorsa
Line no. To convert: Multiply by:
1 c to L 0.237
2 L to c 4.227
3 c to gal 0.063
4 gal to c 16
5 gal to L 3.785
6 L to gal 0.264
7 mL to cc 1
8 cc to mL 1
9 mL to tsp 0.203
10 tsp to mL 4.929
11 mL to tbs 0.067
12 tbs to mL 14.787
13 oz to mL 29.574
14 mL to oz 0.034
15 qt to L 0.946
16 L to qt 1.057

ac = cup (US); L = liter; gal = gallon (US); mL = milliliter; cc = cubic centimeter; tsp = teaspoon (US); tbs = tablespoon (US); oz = ounce (US); qt = quart (US).

References

1. 1988. Nutrient Requirements of Swine. 9th ed. National Academy Press, Washington, DC.
2. Online Conversion. 20 http://www.onlineconversion.com/volume.htm. Accessed February 10, 2009.