Heart & coagulation

Factor X activity unit converter

Activity of coagulation factor X

Also known as: Factor X, FX, Faktor X, Coagulation factor X

Converter

Enter a value in any unit and all other units fill in.

IU/mL % = IU/dL

Worked example

100 % (middle of the reference range) = 1 IU/mL

Conversion formulas

IU/mL	IU/mL = % × 0.01	% = IU/mL × 100

Good to know

The activity of coagulation factor X is reported in % or in IU/dL (identical) or in IU/mL.

1 IU/dL = 1 %; 1 IU/mL = 100 %.
Children, newborns and people on anticoagulants have different values, so the range shown applies to untreated adults.

Reference range

Unit	Adults
IU/mL	0.5 – 1.5
% = IU/dL	50 – 150

Source: Newcastle Hospitals Laboratories: Factor X Assay · Last reviewed: 2026-10-19

Note from the source: 50-150 IU/dL (= 50-150 %) (Newcastle Hospitals Laboratories). Children have different ranges; assay-specific

Frequently asked questions

How do I convert Factor X activity from % to IU/mL?

IU/mL = % × 0.01. In the other direction: % = IU/mL × 100.

What is the reference range of Factor X activity?

For adults the range is 50 – 150 % (Newcastle Hospitals Laboratories: Factor X Assay). Reference ranges differ between laboratories and partly by sex and age; use the range printed on your lab report.

Which units are used for Factor X activity?

Common units are IU/mL, %.