What is the standard FFP dose?

The standard dose is 10–15 mL per kilogram of body weight. A dose of 10 mL/kg is typical for mild-to-moderate coagulopathy; 15 mL/kg is used when more aggressive factor replacement is needed. Always follow institutional protocols and clinical judgment.

How many mL does one FFP unit contain?

A single FFP unit typically contains 200–280 mL depending on the donor and processing method. Most clinical calculators and blood banks use 250 mL as the standard approximation. Confirm with your blood bank for the actual volume used at your institution.

When is FFP indicated?

Common indications include warfarin reversal when vitamin K is insufficient, active bleeding with multiple coagulation factor deficiencies, liver disease with coagulopathy, DIC, massive transfusion protocols, and thrombotic thrombocytopenic purpura (TTP) as part of plasma exchange.

Is this calculator a substitute for clinical judgment?

No. This tool is for educational and reference purposes only. Actual FFP dosing must be guided by laboratory values (PT/INR, fibrinogen), clinical context, institutional protocols, and the treating physician's judgment.

Does FFP require ABO compatibility?

Yes. FFP should be ABO compatible with the recipient's red blood cells. Group AB FFP is the universal donor. Rh type is not a concern for FFP.

Why does the result round up?

FFP is dispensed as whole units. The calculator rounds up to ensure the patient receives at least the minimum calculated dose. Ordering a partial unit is not practical.

FFP Dose Calculator

Enter patient weight and dosing target to calculate total FFP volume (mL) and approximate number of units needed for coagulation factor replacement.

Patient & Dosing Parameters

Enter weight and dosing target to calculate FFP volume and units.

Patient Weight

Dosing Target (mL/kg)

mL/kg

10 — conservative 15 — aggressive

Volume per FFP Unit (mL)

Standard is 250 mL. Confirm with your blood bank.

Enter patient weight and click Calculate to see results.

FFP Dosing Reference

Dose	Context
10 mL/kg	Mild coagulopathy; initial or maintenance dosing
12–13 mL/kg	Moderate INR elevation or active bleeding
15 mL/kg	Severe coagulopathy; massive transfusion protocol
1 unit	~200–280 mL per bag (institution-dependent)

For educational reference only. Dosing decisions must be guided by laboratory values, clinical context, and institutional protocols.

Summary

Fresh Frozen Plasma (FFP) is used to replace coagulation factors in patients with bleeding disorders, liver disease, disseminated intravascular coagulation (DIC), or warfarin reversal. The standard dosing range is 10–15 mL per kilogram of body weight. Each unit of FFP typically contains 200–280 mL (commonly approximated as 250 mL). This calculator takes patient weight and the chosen dose per kg to output total volume required and the approximate number of FFP units to order.

How it works

Enter the patient weight in kilograms or pounds (automatic conversion applies).
Select or type a dosing target between 10 and 15 mL/kg — 10 mL/kg is a conservative starting dose; 15 mL/kg provides more aggressive factor replacement.
Enter the volume per FFP unit (default 250 mL; adjust if your blood bank uses a different standard).
The calculator multiplies weight (kg) by the dose to get total volume in mL.
It then divides total volume by mL per unit and rounds up to the nearest whole unit.
Review the summary and share with the clinical team or transfusion service.

Use cases

Calculating FFP dose for warfarin reversal prior to urgent surgery.
Estimating plasma units needed in a massive transfusion protocol (MTP).
Dosing FFP for patients with liver failure and coagulopathy.
Guiding FFP orders in DIC management.
Teaching medical students and residents how to calculate transfusion doses.
Cross-checking bedside dosing calculations in the emergency department.

Frequently Asked Questions

Last updated: 2026-06-18 · Reviewed by Nham Vu