wikiHow Blood Volume Calculator Blood Volume (mL) = Body Weight (kg) x 70 mL/kg (for men) or 65 mL/kg (for women) For example, if a 70 kg man wants to estimate his blood volume: Blood Volume = 70 kg x 70 mL/kg = 4,900 mL or 4.9 liters Or if a 60 kg woman wants to estimate her blood volume: Blood Volume = 60 kg x 65 mL/kg = 3,900 mL or 3.9 liters It's important to note that this is just an estimate and may vary based on individual factors such as height, muscle mass, and hydration status. Consult with a healthcare professional if you have concerns about your blood volume. Page