Free Testosterone Calculator

Testosterone Units Conversion Tool

Click here for our testosterone unit conversion tool.

Find out more about TRT in the UK

TRT UK Guide

 

How to use this free testosterone calculator

Assuming you have had your testosterone blood testing done you may want to use our calculation tools to help you understand your results.

Total Testosterone is only part of the picture. If you let your doctor tell you that everything is fine or you are normal and they haven’t measured or calculated your FREE TESTOSTERONE, then your at risk of being misdiagnosed, and will continue to suffer through with symptoms of low testosterone levels.

Free Testosterone is the portion of unbound male hormone that is free from binding proteins.

Our calculator will help you either estimate or accurately determine what your Free Testosterone level is.

You will need the following in order to calculate:

Albumin:

This is a protein that weakly binds to your testosterone. The albumin and testosterone bound together is called bioavailable testosterone.

This complex can become more easily disassociated than the Testosterone bound to SHBG or sex hormone binding globulin.

Make sure you have the correct units before entering the albumin into the calculator. Albumin in the UK is normally expressed as g/L and the average is around 43g/L.

If you do not know your albumin level then use the preset number of 43 g/L.

SHBG:

This is the sex hormone binding globulin and this is expressed in the units nmol/L

Testosterone:

This is the Total Testosterone and this is used to calculate your free testosterone based on the albumin and the SHBG levels.

Optimal Testosterone Levels

Measurements in SI Units (nmol/L)
Age	Total Test	Stand Dev	Free Test	Stand Dev	SHBG	Stand Dev
25-34	21.4	5.9	0.43	0.10	35.5	8.8
35-44	23.1	7.4	0.36	0.04	40.1	7.9
45-54	21	7.4	0.31	0.08	44.6	8.2
55-64	19.5	6.8	0.29	0.07	45.5	8.8
65-74	18.2	6.8	0.24	0.08	48.7	14.2
75-83	16.3	5.8	0.21	0.08	51.0	22.7
85-100	13	4.6	0.19	0.08	65.9	22.8

 

Measurements in Conventional Units (ng/dl) SHBG in (nmol/L)
Age	Total Test	Stand Dev	Free Test	Stand Dev	SHBG	Stand Dev
25-34	617	170	12.3	2.8	35.5	8.8
35-44	668	212	10.3	1.2	40.1	7.9
45-54	606	213	9.1	2.2	44.6	8.2
55-64	562	195	8.3	2.1	45.5	8.8
65-74	524	197	6.9	2.3	48.7	14.2
75-83	471	169	6.0	2.3	54.0	22.7
85-100	376	134	5.4	2.3	65.9	22.8

 

Normal Testosterone Levels in men (non-diabetic)

Measurements in SI Units (nmol/L)
Age	Total Test	Stand Dev	Median TT	5th %	10th %	95th %
<25	24.0	5.5	24.2	14.2	16.2	33.1
25-29	23.2	7.1	22.1	13.5	15.2	34.8
30-34	21.5	6.7	20.7	12.1	13.5	33.8
35-39	20.7	6.6	19.7	11.4	13.5	32.8
40-44	20.7	6.9	20.7	11.0	13.1	32.4
45-49	18.9	5.7	18.3	11.4	12.4	29.3
50-54	18.9	6.5	17.9	10.0	12.1	32.4
55-59	19.1	6.0	19.0	11.0	11.7	30.0

Source: Androgens and the Aging Male – B.J. Oddens, A. Vermeulen

If you are looking to get your testosterone levels optimised and are thinking about how to get TRT, consider speaking to us today.