# Fitness Age — Cardio Fitness Tracker

> Cardio fitness tracker calculating fitness age, relative age, and percentile. (iPhone/iPad app by AMPWATER APPS PTY LTD.)

- Source: https://appshunter.io/ios/app/fitness-age/id1619907572 (this page in markdown: same URL + `.md`)
- Developer: [AMPWATER APPS PTY LTD](https://appshunter.io/developer/1867141936)
- Category: Health & Fitness, Utilities
- Price: Free with in-app purchases
- Rating: 4.85/5 from 13 App Store ratings · 4 written reviews indexed
- Age rating: 4+
- Requires: iOS 17.0 · 6 MB
- Languages: English
- Released: 2022-04-29
- Data updated: 2026-08-21
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/fitness-age/id1619907572/reviews.md

## What is Fitness Age?

This app makes tracking your cardio fitness easy. Built to work with the Apple Health app, Fitness Age painlessly calculates your fitness age, relative age and percentile from your cardio fitness scores. You can track your progress over time with the History graph that you can pinch, zoom, resize and expand. Add the app to your Apple Watch for customised complications on your favourite watch face. Cardio fitness is an excellent measure of your overall health, and your fitness should be as easy to understand as possible. Stop looking up conversion tables, and give this app a whirl. 

What sets this app apart?
VO₂ max is the gold standard for measuring your cardio fitness but it's tricky to understand what is a good number for you. This app takes the guess work out of it and converts your VO₂ max score to something far easier to understand. The simplicity of this calculation is the major benefit of this app. Others may try to combine different factors to calculate an age using mysterious undocumented algorithms. The Fitness Age app is backed by a simple scientific data. This app's killer feature is the ability to choose between the two largest databases, or you can even use your own custom dataset to tailor the calculation to your specific fitness circumstances.

Features:
- Works with Apple Health
- Calculates your Fitness Age from your Cardio Fitness level and biological sex
- Converts your Fitness Age to an age-adjusted Relative Age or age-adjusted Percentile.
- Interactive and customisable History graphs to track your progress over time
- Improved UI and UX design. The app is easier to use than ever before.
- Data screen allows you to see the raw numbers in a convenient way
- Ability to add samples from within the app. Saves directly to Apple Health.
- Apple Watch app for quick updates and Watch face complications
- Multiple conversion algorithms available based on the FRIEND fitness data (Fitness Registry and the Importance of Exercise: A National Data Base). You can even create your own for a more customised experience.
- NEW: Easy sharing to make it simpler for you to keep your friends and family up to date

Fitness Age:
Your fitness age is calculated by comparing your cardio fitness scores to population averages. As you age, your cardio fitness is expected to decline which in turn causes your fitness age to rise. Frequent excercise will help to lower your fitness age.
		
Relative Age:
Your relative age is calculated as the difference between your fitness age and your actual age. As it is age adjusted, it remains stable over time. It is a good indicator of changing fitness levels over long periods of time.
		
Percentile:
Your percentile is calculated by comparing your fitness level to the fitness ranges of people your age. It is a good indicator of how you compare to other people your age.
		
VO₂ max:
Your VO₂ max is THE measure of your cardio fitness. This is the underlying measurement used to calculate your Fitness Age, Relative Age and Percentile. The Apple Health app, along with your Apple Watch can be setup to measure your VO₂ max data as 'Cardio Fitness'. You can read more about how VO₂ max is calculated in the Apple Health app.
		

* All calculations are estimates only, but are a simple, easy-to-understand, fitness value. Individual results will vary.

The app requires access to your 'Cardio Fitness' level (VO₂ max) to calculate your fitness age. Your age and sex is required in order to calculate your relative age & percentile. If the results don't seem quite right, make sure you have setup 'Cardio Fitness' measurements & your age and sex in the Apple Health app, and given the necessary permissions for this app to access health data in your device settings.

Unlock History:
The free version has a limited history (to the last 3 months). You can unlock this feature, and all future premium features, with an In-App Purchase.

## Key features

- Works with Apple Health
- Calculates Fitness Age, Relative Age, and Percentile
- Interactive History graphs
- Apple Watch app and complications
- Multiple conversion algorithms
- Improved UI/UX design
- Add samples from within the app

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Unlock All Features | $8.99 | one-time |


## Recent user reviews (4 of 4)

All indexed reviews: https://appshunter.io/ios/app/fitness-age/id1619907572/reviews.md

### 5/5 — Brilliant

*2024-06-18*

I am so young now! Love it. 🥰No idea if it is accurate.

### 5/5 — Thanks!!

*2023-05-25*

Really appreciate the accuracy and simple user interface. Thanks thanks thanks!!!

Syncs great with Apple Watch and I’ll be getting an auro ring as well soon so I’m excited.

### 5/5 — yay

*2023-03-29*

works so easily with apple watch data, thanks!!

### 3/5 — Waiting for data

*2023-01-02*

Life king Garmin user. So I don’t have enough data for the cardio fitness to track.  So we’ll see once it’s got enough data

## Frequently asked questions about Fitness Age

### What is Fitness Age?

Fitness Age calculates your fitness age by comparing your cardio fitness scores to population averages. As you age, your cardio fitness is expected to decline, causing your fitness age to rise. Frequent exercise can help lower your fitness age.

### How does Fitness Age calculate Relative Age?

Relative Age is calculated as the difference between your fitness age and your actual age. It is age-adjusted to remain stable over time and serves as a good indicator of changing fitness levels over long periods.

### What is the Percentile feature in Fitness Age?

The Percentile feature in Fitness Age compares your fitness level to the fitness ranges of people your age. It provides a good indicator of how you measure up against others in your age group.

### Does Fitness Age work with Apple Watch?

Yes, Fitness Age offers an Apple Watch app for quick updates and customizable complications on your watch face, allowing for easy access to your fitness data.

### What data does Fitness Age need to function?

Fitness Age requires access to your 'Cardio Fitness' level (VO₂ max) from Apple Health. Your age and sex are also needed to calculate your relative age and percentile.

### How often is Fitness Age updated?

The latest version of Fitness Age is 2.1, and it was last updated on July 30, 2025, indicating active development and regular improvements.

### What are the conversion algorithms used in Fitness Age?

Fitness Age utilizes multiple conversion algorithms based on the FRIEND fitness data (Fitness Registry and the Importance of Exercise: A National Data Base) to provide comprehensive fitness calculations.

### Is Fitness Age suitable for all ages?

Fitness Age is rated for ages 4 and up, making it accessible for a wide range of users interested in tracking their cardio fitness.

## Version history (last 5 releases)

### 2.2 — 2026-04-07

2.2:
- NEW: The percentile graph now also shows how man standard deviations your fitness is from the mean
- NEW: Easy sharing to make it simpler for you to keep your friends and family up to date
- NEW: You can now see the algorithm in the app for the first time — and even create your own for a more customised experience.
- Improved graph to always show your latest sample without averaging
- Graph settings now persist across launches so you can keep the settings exactly how you prefer them

2.1:
- NEW: iPad support. View your health data on the big beautiful screen of iPad.

2.0:
- NEW: Improved UI and UX design. The app is easier to use than ever before.
- NEW: Data screen allows you to see the raw numbers in a convenient way
- NEW: Ability to add samples from within the app. Saves directly to Apple Health.
- NEW: Ability to customise the history graph. Now you can show/hide elements to your exact preferences.
- Performance improvements across the board.
- Various fixes and stability improvements

### 2.1 — 2025-07-30

2.1:
- NEW: iPad support. View your health data on the big beautiful screen of iPad.

2.0:
- NEW: Improved UI and UX design. The app is easier to use than ever before.
- NEW: Data screen allows you to see the raw numbers in a convenient way
- NEW: Ability to add samples from within the app. Saves directly to Apple Health.
- NEW: Ability to customise the history graph. Now you can show/hide elements to your exact preferences.
- Performance improvements across the board.
- Various fixes and stability improvements

### 2.0 — 2025-07-29

- NEW: Improved UI and UX design. The app is easier to use than ever before.
- NEW: Data screen allows you to see the raw numbers in a convenient way
- NEW: Ability to add samples from within the app. Saves directly to Apple Health.
- NEW: Ability to customise the history graph. Now you can show/hide elements to your exact preferences.
- Performance improvements across the board.
- Various fixes and stability improvements

### 1.1.4 — 2023-06-03

Fixes a layout issue with the tab bar on Max devices.

### 1.1.3 — 2023-03-09

- Device will now push latest sample to your paired watch, in addition to receiving Apple Health updates. This eliminates the need to perform a workout on a new Watch to register a VO2 max.

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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 2026-08-21.*