# T Calc

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

- Source: https://appshunter.io/ios/app/t-calc/id989710656 (this page in markdown: same URL + `.md`)
- Developer: [ViralMD](https://appshunter.io/developer/989710655)
- Category: Medical
- Price: Free
- Rating: 2.70/5 from 3 App Store ratings · 4 written reviews indexed
- Age rating: 4+
- Requires: iOS 13.0 · 2 MB
- Languages: American English, Danish, European Portuguese, Russian, European Spanish, Swedish, Ukrainian
- Released: 2015-06-15
- Data updated: 2026-06-11
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/t-calc/id989710656/reviews.md

## What is T Calc?

The Free Testosterone and Bioavailable Testosterone Calculator application is designed to assist clinicians in accurately determining circulating bioactive testosterone levels. Simply plug in the appropriate lab values and push a button for fast, accurate results.

How to use the Free & Bioavailable Testosterone Calculator 

The Free & Bioavailable Testosterone Calculator reduces the risk of errors that can occur when performing complicated calculations by hand. To use the app, input current lab values into the specified boxes for:

- Albumin
- SHBG
- Testosterone 

Once lab values are in place, press the calculate button and let the Free & Bioavailable Calculator app do the math.

Free & Bioavailable Testosterone

Testosterone and dihydrotestosterone (DHT) circulate in plasma unbound (free approximately 2-3 percent), bound to specific plasma proteins (SHBG), and weakly bound to non-specific proteins such as albumin. The SHBG-bound fraction is biologically inactive because of the high binding affinity of SHBG for testosterone. 

Bioavailable testosterone measurement includes the free plus the weakly bound.  Free testosterone measures the free fraction.

Certain health conditions and medications, such as corticosteroids, can affect SHBG levels, impacting total serum testosterone concentration. Combining albumin, sex hormone-binding globulin (SHBG) and testosterone levels provides a more precise measurement of total serum testosterone concentration. 

Free Testosterone Reference Range
Males (16 years and above): 9-30 ng/dL
Females: 0.3–1.9 ng/dL

Bioavailable Testosterone Reference Range

Males:
20-29 years: 83-257 ng/dL
30-39 years: 72-235 ng/dL
40-49 years: 61-213 ng/dL
50-59 years: 50-190 ng/dL
60-69 years: 40-168 ng/dL
>69 years: not established

Females (non-oophorectomized)
20-50 years (on oral estrogen): 0.8-4.0 ng/dL
20-50 years (not on oral estrogen): 0.8-10 ng/dL
>50 years: not established

This website/app has been developed in part through an educational grant from Besins Healthcare (UK) Ltd. The company has no editorial control on its content.
 
IMPORTANT LIMITATIONS:  This calculator is an educational tool and should not be solely relied upon in making any clinical decision.  No responsibility whatsoever is assumed for its correctness or suitability for any given purpose. Please consult your health care provider first for any health concerns.

Additionally, the calculated free and bioavailable testosterone should not be relied upon in situations with potential massive interference by steroids binding to SHBG (e.g. in women during pregnancy, in men during treatment inducing high levels of DHT or Mesterolone.

## Key features

- Calculate free testosterone
- Calculate bioavailable testosterone
- Input lab values (Albumin, SHBG, Testosterone)
- Reduce manual calculation errors
- Fast and accurate results
- Reference ranges provided

## Recent user reviews (4 of 4)

All indexed reviews: https://appshunter.io/ios/app/t-calc/id989710656/reviews.md

### 1/5 — Doesn’t Work

*2024-02-03, version 2.2*

Any numbers entered from keyboard doesn’t show, only blanks.

### 3/5 — Good App. Latest update causes letters to be invisible

*2021-06-01*

Latest update causes the letters to be invisible

### 5/5 — Pharamcist

*2015-10-26, version 1.0.2*

Works great. Very helpful when helping hormone patients.

### 5/5 — Easy and simple

*2015-07-19, version 1.0.1*

Nice and simple. Does exactly what I need.

## Frequently asked questions about T Calc

### What is T Calc used for?

T Calc is a medical calculator designed to help clinicians accurately determine circulating free and bioavailable testosterone levels by inputting lab values for Albumin, SHBG, and Testosterone.

### How does T Calc work?

Users input current lab values for Albumin, SHBG, and Testosterone into the app. Once the values are entered, the app performs the calculations to provide free and bioavailable testosterone results.

### Can T Calc be used for clinical decisions?

T Calc is an educational tool and should not be solely relied upon for clinical decisions. Users are advised to consult a healthcare provider for any health concerns.

### What are the reference ranges for testosterone provided by T Calc?

T Calc provides reference ranges for both free and bioavailable testosterone for males and females across different age groups, aiding in result interpretation.

### What devices does T Calc support?

T Calc is available for iPhone and iPod devices, running on iOS.

### How often is T Calc updated?

The latest version of T Calc is 2.3.1, and it was last updated on April 4, 2024, indicating regular maintenance and updates.

### Is T Calc free to use?

Yes, T Calc is completely free to download and use, with no in-app purchases or advertisements.

### What is the user rating for T Calc?

T Calc has a rating of 2.7 stars based on 3 user ratings, suggesting mixed user experiences.

## Version history (last 5 releases)

### 2.3.1 — 2024-04-04

Support the latest version.

### 2.3 — 2024-04-01

Support the latest version.

### 2.2 — 2021-05-31

Update iOS SDK

### 2.1 — 2018-08-22

This app has been updated by Apple to display the Apple Watch app icon.

- Support iPhone X

### 2.0 — 2017-04-06

Improve Overall User Experience and Support for International Users.

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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 2026-06-11.*