Approximately how many gallons of blood does an average adult human have?

• A. About 3.5 gallons
• B. About 6 gallons
• C. About 1.5 gallons
• D. About 0.5 gallon

Answer: (C)

Verified step by step guidance

1. Understand that the average adult human blood volume is typically measured in liters or gallons and varies based on factors like body size and sex.
2. Recall that the average blood volume for an adult is approximately 7% to 8% of their total body weight.
3. Convert this percentage into volume by knowing that 1 liter of blood roughly equals 0.264 gallons.
4. Estimate the average adult body weight (for example, around 70 kg or 154 lbs) and calculate the blood volume in liters using the percentage (e.g., 7% of 70 kg = 4.9 liters).
5. Convert the calculated blood volume from liters to gallons using the conversion factor (liters × 0.264) to find the approximate number of gallons of blood in an average adult.