Blood Volume Calculator

Standard donation: 450 mL (~8% of blood volume). Replaced within 24 hours. Plasma donation (safer): 650 mL × 1–2 times weekly. Whole blood: 6–8 weeks between donations.

Transfusion volume calculations. Shock assessment: blood loss < 15% asymptomatic; 15–30% tachycardia; > 30% hypotension/collapse. Guides ICU management.

Yes. Pregnancy: +30–50% (up to 5.5 L). Altitude: increased RBC production (higher blood volume). Chronic dehydration: lower effective volume (hemoconcentration).