# Fresh Frozen Plasma Dose Calculator

URL: https://speedycalculator.com/calculators/health/fresh-frozen-plasma-dose/
Last updated: 2026-10-30

> The fresh frozen plasma dose calculator estimates the volume and number of units of FFP for a patient from weight at the usual 10–20 mL/kg, as used to correct clotting factor deficiencies.

## Inputs

- Weight (kg, lb, st, g)
- Dose (mL/kg)
- Volume per unit (mL)

## Results

- FFP volume
- Number of units

## Formula

```
FFP volume (mL) = weight (kg) × dose (mL/kg)
Units = volume ÷ unit volume (about 250 mL)
```

## Explanation

FFP contains all clotting factors. The usual starting dose of 10–15 mL/kg raises factor levels by about 15–25%. It is used for bleeding with multiple factor deficiencies, massive transfusion and some plasma exchange; for warfarin reversal, prothrombin complex concentrate is preferred.

### How to use the Fresh Frozen Plasma Dose Calculator

- **Weight**
- **Dose**
- **Volume per unit**

Results update as you type, and every field accepts the units shown in its menu.

### How it works

Enter weight, dose per kg and the volume of a unit at your blood bank. Final dosing is a clinical decision.

### Inputs explained

FieldWhat to enterWeightUnits: kg, lb, st, gDoseIn mL/kgVolume per unitIn mL

### What each result means

- **FFP volume** = [Weight]×[Dose]
- **Number of units** = ceil([FFP volume]÷[Volume per unit])

### Example values

How the main result changes when **Weight** changes and everything else stays at the example values above:

Weight (kg)FFP volume (mL)3552552.5788701,05087.51,3131051,5751402,100
*Health note: this calculator is for education and screening only and is not a diagnosis or treatment advice. Discuss your results with a qualified clinician.*

## Worked example

Inputs — Weight: 70 kg; Dose: 15 mL/kg; Volume per unit: 250 mL.

Results — **FFP volume = 1,050 mL**; Number of units = 5.

## Key terms

- **FFP**: Fresh frozen plasma.

## FAQ

**What is the usual FFP dose?**
10–15 mL/kg, up to 20 mL/kg in massive bleeding.

**How long does FFP take to thaw?**
About 20–30 minutes.

**Is FFP used to reverse warfarin?**
Prothrombin complex concentrate and vitamin K are preferred where available.


## Sources

- [British Society for Haematology – Guidelines on the use of plasma](https://b-s-h.org.uk/guidelines)