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Converting ounces to grams

Aviation Mechanic General (AMG) practice question 18 of 25 on Mathematics. ACS element AM.I.H.K7 · difficulty: applied. Want to answer it in a timed quiz? Use the Aviation Mechanic General (AMG) practice mode.

Question bank updated 2026-09-22

QUESTIONA component is listed as weighing 12 ounces. What is its weight in grams?

  1. A0.4233 grams
  2. B3,402 grams
  3. C340.2 grams
Show the answer and explanation

Correct answer: C. 340.2 grams

  • A — incorrect Dividing 12 by 28.35 goes the wrong direction; a gram is smaller than an ounce, so the number of grams must be larger.
  • B — incorrect This misplaces the decimal point; 12 × 28.35 is 340.2, not 3,402.
  • C — correct To convert ounces to grams, multiply by 28.35: 12 × 28.35 = 340.2 grams.

BACKGROUND

The United States primarily uses the conventional (U.S. or English) system but is slowly integrating the metric (SI) system, so the mechanic must sometimes convert between them. The handbook gives conversion factors for length, area, volume, weight and temperature. One ounce equals 28.350 grams, so to convert ounces to grams, multiply the number of ounces by 28.35. The handbook example is 12 ounces = 12 × 28.35 = 340.2 grams. Likewise, inches are converted to millimeters by multiplying by 25.4.

STUDY TIP

Learn the two worked conversions in the handbook, inches × 25.4 = millimeters and ounces × 28.35 = grams, and check that the answer moves in the sensible direction.

KEY POINTS

  • Conversions are needed because the U.S. uses both conventional and metric units.
  • Ounces × 28.35 = grams; 12 oz = 340.2 g.
  • Inches × 25.4 = millimeters.

SOURCES

  • FAA-H-8083-30B ch03 "Measurement Systems & Conversions"
Practice the Aviation Mechanic General (AMG) test →Timed 60-question exam, by ACS area, or review your misses. Free.
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SkyDrill is not affiliated with the FAA. This is an original practice item based on FAA-H-8083-30B Aviation Maintenance Technician Handbook – General, 14 CFR part 43 and part 65. Regulations and handbooks are revised; confirm details against the current edition.