Chapter 1. Basic Concepts in Nutrition

# Units of Measure

In nutrition, there are two systems of commonly used measurements: Metric and US Customary. We need both because the US won’t adopt the metric system completely.

## The Metric and US Customary System

These are commonly used prefixes for the Metric System:

 Micro- (μ) 1/1,000,000th (one millionth) Milli- (m) 1/1000th (one thousandth) Centi- (c) 1/100th (one hundredth) Deci- (d) 1/10th (one tenth) Kilo- (k) 1000x (one thousand times)

### Mass

 Metric System US Customary System Conversions Microgram (μg) Ounce (oz) 1 oz = 28.35 g Milligram (mg) Pound (lb) 1 lb = 16 oz Gram (g) 1 lb = 454 g Kilogram (kg) 1 kg = 2.2 lbs

### Volume

 Metric System US Customary System Conversions Milliliter (mL) Teaspoon (tsp) 1 tsp = 5 mL Deciliter (dL) Tablespoon (tbsp) 1 tbsp = 3 tsp = 15 mL Liter (L) Fluid ounce (fl oz) 1 fl oz = 2 tbsp = 30 mL Cup (c) 1 c = 8 fl oz = 237 mL Pint (pt) 1 pt = 2 c = 16 fl oz Quart (qt) 1 qt = 4 c = 32 fl oz = 0.95 L Gallon (gal) = 4 qt 1 gal = 4 qt

### Length

 Metric System US Customary System Conversions Millimeter (mm) Inch (in) 1 in = 25.4 mm Centimeter (cm) Foot (ft) 1 ft= 30.5 cm Meter (m) Yard (yd) 1 yd = 0.9 m Kilometer (km) Mile (mi) 1 mi = 1.6 km 