Blood Volume Calculator

Estimate total blood volume (Nadler formula)

Use this when you need a fast, accurate result — no sign-up, works entirely in your browser.

Body weight (kg)

Height (cm)

Biological sex

Blood volume (L)—

Plasma (L)—

Red blood cells (L)—

How to Use

Enter your details into the fields above.
Click the calculate button to get your result instantly.
Use the clear button to start a new calculation.

Example

70 kg, 175 cm male → Blood volume ≈ 4.95 L (plasma ≈ 2.72 L, RBC ≈ 2.23 L)
80 kg, 180 cm, male → Blood volume ≈ 5.32 L (plasma 2.93 L, red cells 2.39 L)

Formula

Nadler formula: BV = 0.3669 × height^0.725 × weight^0.425 − 1.53 (men), with a similar expression for women. Plasma ≈ 55% of BV, red blood cells ≈ 45%.

About Blood Volume Calculator

Estimate total blood volume (Nadler formula). This free online tool gives you fast, accurate results without registration or downloads.

Everything runs locally in your browser, so your data is never uploaded or stored — privacy first.

Frequently Asked Questions

Is this tool free to use? +

Yes, it is completely free with no registration or download required.

Is my data private? +

Yes. Everything is processed locally in your browser. Nothing is uploaded or stored on our servers.

Does it work on mobile? +

Yes, it works on any device — phone, tablet, or desktop.