# VO2 Max Calculator — Passive VO2 Max Calculator

> Passive VO2 Max calculator using heart rate data. (iPhone/iPad app by Theo Scott.)

- Source: https://appshunter.io/ios/app/vo2-max-calculator/id1586812282 (this page in markdown: same URL + `.md`)
- Developer: [Theo Scott](https://appshunter.io/developer/691156625)
- Category: Health & Fitness, Lifestyle
- Price: $1.99
- Rating: 2.40/5 from 14 App Store ratings · 13 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.6 · 1 MB
- Languages: American English
- Released: 2021-09-23
- Data updated: 2026-08-30
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/vo2-max-calculator/id1586812282/reviews.md

## What is VO2 Max Calculator?

Lay down and take a VO2 Max reading. 3 mins. Simple. 

How is this done?

Read this published scientific paper by UTH N., SORENSEN H., OVERGAARD K., PEDERSEN PK. (2004) Estimation of VO2max from the ratio between HRmax and HRrest--the Heart Rate Ratio Method. Eur J Appl Physiol. Jan;91(1):111-5.

For help watch this video https://youtu.be/lV5oyoW213A
or contact me on https://twitter.com/ZoneTrainingApp/ for help.

Note: This is not a medical test, and data use to calculate VO2Max is calibrated against the average population. 

Medical disclaimer:
The medical/health information is provided for general informational and educational purposes only and is not a substitute for professional advice. Accordingly, before taking any actions based upon such information, we encourage you to consult with the appropriate professionals. We do not provide any kind of medical/health advice. THE USE OR RELIANCE OF ANY INFORMATION CONTAINED ON OUR MOBILE APPLICATION IS SOLELY AT YOUR OWN RISK.

## Key features

- Passive VO2 Max reading
- 3-minute calculation
- Based on scientific research
- General health information
- Video tutorial available

## Recent user reviews (10 of 13)

All indexed reviews: https://appshunter.io/ios/app/vo2-max-calculator/id1586812282/reviews.md

### 4/5 — 1 year

*2023-11-21*

I only review products I’ve used consistently for at least 1 year. 

I was frustrated when I first downloaded it because the age font is small enough that I couldn’t get it to adjust. I worked that out after a few tries. 

My first few readings were high, these were taken without exercising, but when I took it during or immediately after a workout I found that it gave me a relatively close, although a bit low, reading. 

It has to be tight on my wrist to work properly. I now take 4-5 readings throughout the day with at least two during my workouts, then I average the results. 

For a free app I thinks it’s a great tool when used properly. Don’t expect to get a highly accurate reading from it, the technology just isn’t there yet, however using this beats paying thousands of dollars a year and cumbersome equipment to get a daily vo2 max reading.

**Developer response:** Thanks for your review. The VO2MAxX you getting is a rough estimate, calibrate statically against the averg population. A true Vo2Max can only be measured in lab, where you wear a oxygen mask that measures your O2 intake while doing an exercise (like running, cycling) that would exhaust the O2 in the blood.

### 5/5 — Very good VO2max estimate

*2023-03-15*

The only thing that’s missing is the ability to send the data to Apple’s Health (or keep track of the results itself).  We can still add the data manually to Apple’s Health, so I guess it’s ok.

**Developer response:** Thank you for the review.

### 1/5 — Yeah no…

*2023-02-02*

My VO2 max was calculated to be 81!!!! NO WAY!!!! DELETE

### 1/5 — Loved how this worked

*2023-01-25*

Completely inaccurate. My VO2 should be terrible but my result was 80. Free app or not there is no excuse for not following the equations available.

**Developer response:** Do you take any medication, like beta blockers ? If you take another test, do you still get a high result?

### 4/5 — Will have to do more testing

*2022-12-29*

For everyone that is complaining that it’s a waste of money, it’s a free app. I appreciate the fact that the developer created an app that doesn’t require in app purchases.

I’ll have to see if this is really that accurate. I’m sure it’s not as accurate as sports physiology testing equipment. That’s OK, provided that it is consistent. If it shows improvement overtime, it’s probably a useful tool to determine whether or not your cardiovascular fitness is improving. I’m not so worried about the absolute number, but I do hope that it is consistent and can be used to track progress overtime.

**Developer response:** Thank you for the review.  You are correct when you say the app is not going to be as accurate as a proper medical test, but is a simple guide and the hope is to encourage people to take up exercise. Users that use the Apple Watch workout app will find it will records your VO2 for particular workouts, and yes it is a more accurate measurement because it is an active measurement.

### 1/5 — Don’t waste your time

*2022-11-25*

The app just doesn’t work. I get no results when using.

**Developer response:** Not sure how you paid any money ("Don’t waste your money"). The app is free to download.

If by "Just doesn’t work" you mean that it did not give you a result you liked, how is that the fault of the app or the scientific paper mentioned in the description?

Editing: 27 November 2022
It does work!

Below is a youtube video I have taken (just for you), where I download the app, grant heart rate permissions, run the app, and after a few mins you see the VO2Max Result. https://youtu.be/lV5oyoW213A

You can also tweet me at https://twitter.com/ZoneTrainingApp/  or can continue to waste your time ("Don’t waste your time") by adding to this review, helping me to help you.

### 1/5 — Waste

*2022-10-21*

Doesn’t work

**Developer response:** Why do you say it does not work? Or is this a 1 star review given because you did not understand the instructions ?

### 1/5 — This app does nothing, purchased, set my age, and then it doesn't capture my hr.

*2022-08-26*

Waste of a purchase.

**Developer response:** If it does not capture your heart rate, then either your watch is not able to measure your heart or some reason (is loose around your wrist, hair or sweat preventing the sensor to function correctly. You can check this by using Apple Watch Heart app) , or you have not grant permissions for the app to read your heart rate.

### 4/5 — Spot In

*2022-04-21*

I have used this for a couple weeks now and it’s in line with readings off my HR monitor. 

Does what it says and as far as I know the reading is accurate

**Developer response:** Thank you for your kind review.

### 5/5 — Thank you, Theo

*2022-04-16*

Suffering from COPD, the app helps me with keeping the eye on my cardiac health.   Nothing is perfect, but it has helped me move in the right direction.  Thank you.

**Developer response:** Thanks for that 5 star review, never expected it for such a simplistic, "gadget" app.

## Frequently asked questions about VO2 Max Calculator

### What is VO2 Max Calculator?

VO2 Max Calculator is a mobile application designed to estimate your VO2 Max, a measure of your body's maximum oxygen uptake during intense exercise. It uses a simple heart rate method based on published scientific research.

### How does VO2 Max Calculator work?

The app utilizes the Heart Rate Ratio Method, as described in a scientific paper by UTH N. et al. (2004). You lay down and the app guides you through a 3-minute process to collect the necessary heart rate data for calculation.

### Is VO2 Max Calculator a medical device?

No, VO2 Max Calculator is not a medical test. The data used for calculation is calibrated against the average population, and the information provided is for general informational and educational purposes only. It is not a substitute for professional medical advice.

### What devices does VO2 Max Calculator support?

VO2 Max Calculator is available for watch, iPhone, and iPod devices, allowing for convenient use across Apple's ecosystem.

### How much does VO2 Max Calculator cost?

VO2 Max Calculator is a paid application, available for $1.99. There are no in-app purchases or advertisements associated with its use.

### When was VO2 Max Calculator last updated?

The latest version of VO2 Max Calculator is 1.1.3, which was last updated on December 3, 2025. This indicates ongoing support and potential for future improvements.

### What is the user sentiment for VO2 Max Calculator?

Based on the available data, VO2 Max Calculator has a rating of 2.4 stars from 14 ratings. This suggests that user satisfaction may be mixed, with some users finding it less helpful than others.

### Does VO2 Max Calculator have ads?

No, VO2 Max Calculator does not contain advertisements. The application is ad-free, providing an uninterrupted user experience.

## Version history (last 5 releases)

### 1.1.3 — 2025-12-03

updated for watchOS26

### 1.1.2 — 2023-02-07

- Make the app more idiot-proof. 
- Fix a bug where heart rate is sometimes displayed instead of VO2Max result.

### 1.1.1 — 2022-12-02

Add youtube video showing the app *does* work.

### 1.1 — 2022-04-19

Fix spelling mistakes.

### 1.0 — 2021-09-23

No release notes.

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## More apps by Theo Scott

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All apps by Theo Scott: https://appshunter.io/developer/691156625

## Related topics

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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 2026-08-30.*