# Bio-T Testosterone calculator

> Medical calculator for bioavailable and free testosterone levels. (iPhone/iPad app by Niedertronics.)

- Source: https://appshunter.io/ios/app/bio-t-testosterone-calculator/id308770722 (this page in markdown: same URL + `.md`)
- Developer: [Niedertronics](https://appshunter.io/developer/306360019)
- Category: Medical
- Price: Free
- Rating: 2.50/5 from 41 App Store ratings · 9 written reviews indexed
- Age rating: 4+
- Requires: iOS 16.6 · 1 MB
- Languages: American English
- Released: 2009-03-27
- Data updated: 2026-06-08
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/bio-t-testosterone-calculator/id308770722/reviews.md

## What is Bio?

The Bioavailable Testosterone calculator calculates bioavailable and free testosterone from total testosterone, sex hormone binding globulin (SHBG) and albumin. It is intended to be used by qualified healthcare professionals.

The application is an adaptation of the algorithm published in Vermeulen A, Verdonck L, Kaufman JM: A Critical Evaluation of Simple Methods for the Estimation of Free Testosterone in Serum, J. Clin. Endocrinol. Metab. Oct 1, 1999; 84: 3666-3672.

## Key features

- Calculates bioavailable testosterone
- Calculates free testosterone
- Uses total testosterone, SHBG, and albumin
- Based on published algorithm
- Intended for healthcare professionals

## Recent user reviews (9 of 9)

All indexed reviews: https://appshunter.io/ios/app/bio-t-testosterone-calculator/id308770722/reviews.md

### 2/5 — Needs updated

*2017-10-16*

Will not work with iOS11

### 5/5 — Great App!

*2015-02-01*

Great, simple and easy to use application!

### 3/5 — Needs to accept SI units

*2013-01-10, version 0*

Not a useful app at all if you have test results in SI units.  Online calculators allow you to choose units, so should this app.

### 5/5 — Superb

*2011-06-02*

This has to be the best handheld application for determining bioavailable testosterone levels ever written.  Ignore those over priced competitors, use this app!

### 3/5 — International units

*2011-05-18, version 0*

A version of this app with international units would be greatly appreciated.

### 5/5 — Great App, use it every day

*2011-01-19*

Great app for the urology/ andrology community

### 5/5 — Excellent!!!

*2009-04-12*

I use this every single day in practice and had to do it online. Now I don't have to go online and have it readily available. Thanks!

### 1/5 — ?

*2009-04-04*

?

### 1/5 — Hmmm

*2009-04-01*

Bioavalible isn't a word developer. Look it up.

## Frequently asked questions about Bio

### What is Bio-T Testosterone calculator used for?

Bio-T Testosterone calculator is used to calculate bioavailable and free testosterone levels from total testosterone, SHBG, and albumin. It is intended for use by qualified healthcare professionals.

### What is the scientific basis for Bio-T Testosterone calculator?

The application is an adaptation of the algorithm published in Vermeulen A, Verdonck L, Kaufman JM: A Critical Evaluation of Simple Methods for the Estimation of Free Testosterone in Serum, J. Clin. Endocrinol. Metab. Oct 1, 1999; 84: 3666-3672.

### Who is the target audience for Bio-T Testosterone calculator?

This application is intended for use by qualified healthcare professionals who require estimations of testosterone levels in their practice.

### Is Bio-T Testosterone calculator free to use?

Yes, Bio-T Testosterone calculator is available for free.

### What devices does Bio-T Testosterone calculator support?

Bio-T Testosterone calculator currently supports iPhone devices.

### How often is Bio-T Testosterone calculator updated?

The latest version, 2.0, was released on February 9, 2026, indicating ongoing development and updates.

### What is the user rating for Bio-T Testosterone calculator?

Bio-T Testosterone calculator has a rating of 2.5 stars from 41 ratings.

### Does Bio-T Testosterone calculator have ads?

No, Bio-T Testosterone calculator does not contain advertisements.

## Version history (last 2 releases)

### 2.0 — 2026-02-09

Completely rebuilt for modern iOS. New interface, same trusted Vermeulen algorithm.

### 1.0 — 2009-03-27

No release notes.

## More apps by Niedertronics

- [PSA Net](https://appshunter.io/ios/app/psa-net/id306360016)
- [Just Kegel Timer](https://appshunter.io/ios/app/just-kegel-timer/id6754208010)
- [MyGantt](https://appshunter.io/ios/app/mygantt/id6761502656)

All apps by Niedertronics: https://appshunter.io/developer/306360019

## Related topics

[testosterone calculator](https://appshunter.io/ios/topics/testosterone-calculator)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-08.*