Conversions: Metric and Household Systems Chapter 4 Conversions: Metric and Household Systems © 2013 Delmar Cengage Learning. All Rights Reserved. May not be scanned, copied, duplicated, or posted to a publicly accessible website, in whole or in part.

Conversion Slide Use this diagram when converting dosages within the metric system Move decimal point three places to the left for each step kg g mg mcg Move decimal point three places to the right for each step © 2013 Delmar Cengage Learning. All Rights Reserved. May not be scanned, copied, duplicated, or posted to a publicly accessible website, in whole or in part.

Unit Conversions Determining the need for and calculating unit conversions is the first step in dosage calculations © 2013 Delmar Cengage Learning. All Rights Reserved. May not be scanned, copied, duplicated, or posted to a publicly accessible website, in whole or in part.

Math Tip A clue to remember the approximate equivalent 2 pounds for every kilogram The number of kilograms weighed is about half the number of pounds weighed 1 kg 2.2 lbs © 2013 Delmar Cengage Learning. All Rights Reserved. May not be scanned, copied, duplicated, or posted to a publicly accessible website, in whole or in part.

Approximate Equivalents 1 t = 5 mL 1 T = 3 t = 15 mL = ½ fl oz 1 fl oz = 30 mL = 6t © 2013 Delmar Cengage Learning. All Rights Reserved. May not be scanned, copied, duplicated, or posted to a publicly accessible website, in whole or in part.

Approximate Equivalents 1 L = 1 qt = 32 fl oz = 2 pt = 4 cups 1 pt = 500 mL = 16 fl oz = 2 cups 1 cup = 250 mL = 8 fl oz 1 kg = 2.2 lb 1 in = 2.5 cm © 2013 Delmar Cengage Learning. All Rights Reserved. May not be scanned, copied, duplicated, or posted to a publicly accessible website, in whole or in part.

Weight and Volume Equivalents fl oz 6 30 t 5 mL © Cengage Learning 2013 © 2013 Delmar Cengage Learning. All Rights Reserved. May not be scanned, copied, duplicated, or posted to a publicly accessible website, in whole or in part.

Weight and Volume Equivalents Weight Equivalents g 15 1,000 gr mg 60 © Cengage Learning 2013 © 2013 Delmar Cengage Learning. All Rights Reserved. May not be scanned, copied, duplicated, or posted to a publicly accessible website, in whole or in part.

Conversion Factor Method To convert from one unit of measurement to another Recall the equivalents Multiply or divide © 2013 Delmar Cengage Learning. All Rights Reserved. May not be scanned, copied, duplicated, or posted to a publicly accessible website, in whole or in part.

Conversion Factor Method Identify the conversion factor Multiply by the conversion factor to convert to a smaller unit: Think larger to smaller (×) Divide by the conversion factor to convert to a larger unit: Think smaller to larger (÷) © 2013 Delmar Cengage Learning. All Rights Reserved. May not be scanned, copied, duplicated, or posted to a publicly accessible website, in whole or in part.

Math Tip Shortcut for dividing 5,000 by 1,000 Move the decimal three places to the left Eliminate unnecessary zeros 5,000  1,000 = 5.000. = 5 © 2013 Delmar Cengage Learning. All Rights Reserved. May not be scanned, copied, duplicated, or posted to a publicly accessible website, in whole or in part.

Metric Conversions with Conversion Factor Method Multiply to convert from a larger unit to a smaller unit, or move the decimal point to the right © 2013 Delmar Cengage Learning. All Rights Reserved. May not be scanned, copied, duplicated, or posted to a publicly accessible website, in whole or in part.

Metric Conversions with Conversion Factor Method (Continued) Example: 3 L = ? mL Think: Larger to Smaller (×) Equivalent: 1 L = 1,000 mL 3 L = 3 × 1,000 or 3.000 = 3,000 mL k h d Base d c m © 2013 Delmar Cengage Learning. All Rights Reserved. May not be scanned, copied, duplicated, or posted to a publicly accessible website, in whole or in part.

Metric Conversions with Conversion Factor Method (Continued) Divide to convert from a smaller unit to a larger unit, or move the decimal point to the left © 2013 Delmar Cengage Learning. All Rights Reserved. May not be scanned, copied, duplicated, or posted to a publicly accessible website, in whole or in part.

Metric Conversions with Conversion Factor Method (Continued) Example: 400 mg = ? g THINK: Smaller to Larger (÷) Equivalent: 1 g = 1,000 mg 400 mg = 400 ÷ 1,000 or 400. = 0.4 g k h d Base d c m © 2013 Delmar Cengage Learning. All Rights Reserved. May not be scanned, copied, duplicated, or posted to a publicly accessible website, in whole or in part.

Shortcut Conversion Rule Example Order: 125 mcg of Digoxin to be given daily © 2013 Delmar Cengage Learning. All Rights Reserved. May not be scanned, copied, duplicated, or posted to a publicly accessible website, in whole or in part.

Shortcut Conversion (Continued) Supply: Digoxin 0.25 mg scored tablets How many tablets should be administered? 0.25 mg x 1,000 mcg/mg = 0.250. = 250 mcg © 2013 Delmar Cengage Learning. All Rights Reserved. May not be scanned, copied, duplicated, or posted to a publicly accessible website, in whole or in part.

Conversion Set up your conversion problem so you can cancel what is given and end up with what you are converting to © 2013 Delmar Cengage Learning. All Rights Reserved. May not be scanned, copied, duplicated, or posted to a publicly accessible website, in whole or in part.

Conversion (Continued) Find: 12 fl oz = ______ cup(s) Use the formula 1 cup = 8 fl oz © 2013 Delmar Cengage Learning. All Rights Reserved. May not be scanned, copied, duplicated, or posted to a publicly accessible website, in whole or in part.

Conversion (Continued) 1 in = 2.5 cm 1 ft = 12 in © 2013 Delmar Cengage Learning. All Rights Reserved. May not be scanned, copied, duplicated, or posted to a publicly accessible website, in whole or in part.

Conversion (Continued) 1 kg ≈ 2.2 lb 150 pounds ≈ ____ kg © 2013 Delmar Cengage Learning. All Rights Reserved. May not be scanned, copied, duplicated, or posted to a publicly accessible website, in whole or in part.

Quick Review Move decimal point to right to convert from a larger unit to a smaller unit Move decimal point to left to convert from a smaller unit to larger unit © 2013 Delmar Cengage Learning. All Rights Reserved. May not be scanned, copied, duplicated, or posted to a publicly accessible website, in whole or in part.