Quick Reference
The International System of Units (SI) is a decimal-based measurement system widely used in healthcare.
1 US fluid ounce ≈ 30 mL = 30 cc.
Common Units
| Measurement | Units |
|---|---|
| Weight | Grams (g), kilograms (kg), pounds (lb) |
| Length | Millimeters (mm), centimeters (cm), meters (m), inches (in) |
| Volume | Milliliters (mL), liters (L), fluid ounces (fl oz) |
Metric Conversions
| Conversion | Equivalent |
|---|---|
| 1 kg | 1,000 g |
| 1 g | 1,000 mg |
| 1 L | 1,000 mL |
| 1 m | 100 cm |
| 1 cm | 10 mm |
Weight Conversions
- kg → lb: Multiply by 2.2.
- lb → kg: Divide by 2.2.
- 1 kg ≈ 2.2 lb.
Volume Conversions
- 1 US fluid ounce ≈ 30 mL.
- 1 mL = 1 cc.
- 1 L = 1,000 mL.
Examples
- 70 kg × 2.2 = 154 lb.
- 220 lb ÷ 2.2 = 100 kg.
- 8 fl oz × 30 = 240 mL.
- 500 mL = 500 cc.
Important Considerations
- Fluid ounces measure volume; ounces used for body weight measure mass.
- The 30 mL/fl oz conversion is rounded for routine CNA calculations.
- Record measurements with the correct units.
- Follow facility requirements for precision, rounding, and documentation.
- Use consistent methods when tracking changes over time.
Related
Sources
- CNA Module 7 — Weights and Measures
Flashcards
How many milliliters are in one liter?01-foundations / reference-guidelines
Answer
1,000 mL.
Approximately how many mL are in one US fluid ounce?01-foundations / reference-guidelines
Answer
30 mL.