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Unit Conversions – Volume/Capacity

Why This Matters for Nursing: IV fluids in liters, medications in milliliters, intake measured in ounces—nurses constantly convert between volume units. A single error can mean giving a patient 10x too much or too little fluid.

What You Need to Know

Metric Volume

Conversion Factor
1 liter (L) = 1,000 milliliters (mL)
1 mL = 1 cc (cubic centimeter)

US Customary Volume

Conversion Factor
1 cup = 8 fluid ounces (fl oz)
1 pint = 2 cups = 16 fl oz
1 quart = 2 pints = 32 fl oz
1 gallon = 4 quarts = 128 fl oz

US to Metric (Healthcare Key!)

Conversion Factor
1 fl oz ≈ 30 mL
1 cup ≈ 240 mL
1 liter ≈ 33.8 fl oz
1 teaspoon (tsp) = 5 mL
1 tablespoon (tbsp) = 15 mL
Volume Conversion Ladder 1 tsp = 5 mL × 3 ↓ 1 tbsp = 15 mL × 2 ↓ 1 fl oz ≈ 30 mL × 8 ↓ 1 cup = 8 fl oz ≈ 240 mL 1 Liter = 1,000 mL ≈ 33.8 fl oz mL = cc (identical!)

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