Average Human Blood Weight: Density, Volume, and Weight Calculation

Blood weight can be calculated from its density and volume.

Key Values

• Density of whole blood: ~1.06 g/mL (1060 kg/m³)
• Average blood volume:
  • Adult male: ~5.6 L (70–75 mL/kg)
  • Adult female: ~4.7 L (65–70 mL/kg)

Calculated Blood Weight

• Adult male: 5.6 L × 1.06 kg/L = 5.94 kg (13.1 lbs)
• Adult female: 4.7 L × 1.06 kg/L = 4.98 kg (11.0 lbs)

Clinical Context

• Blood accounts for ~7–8% of total body weight.
• Volume varies with body size, fitness, altitude, pregnancy (↑ 30–50%), and pathology.
• Donation removes ~450–500 mL (~0.48 kg / 1 lb).

These are population averages; individual values differ.