# Radiator Calculator — What size of radiator is best?

> Calculate optimal radiator size and quantity for any room based on detailed specifications. (iPhone/iPad app by Physmo.)

- Source: https://appshunter.io/ios/app/radiator-calculator/id1445426217 (this page in markdown: same URL + `.md`)
- Developer: [Physmo](https://appshunter.io/developer/333188621)
- Category: Utilities, Productivity
- Price: $1.99
- Rating: 4.80/5 from 4 App Store ratings · 11 written reviews indexed
- Age rating: 4+
- Requires: iOS 13.0 · 41 MB
- Languages: American English
- Released: 2018-12-13
- Data updated: 2026-09-08
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/radiator-calculator/id1445426217/reviews.md

## What is Radiator Calculator?

'Radiator Calculator' is the must have app for plumbers, builders or home DIY-ers. It quickly and easily allows you to calculate the ideal number and size of radiators for any room in the house.

Room details can be edited or saved for later use. You can even email the room specification and results to yourself or your clients. The app lets you adjust the following features for each room:

Room Type (e.g. Living Room / Kitchen)
Dimensions (switch between Feet and Metres easily)
Glazed Area
Glazing Type
Number of external walls
Wall type
Type of room below (e.g. heated/air gap)
Type of room above

## Key features

- Calculate ideal radiator size and quantity
- Input room details (dimensions, glazing, walls)
- Supports Feet and Metres
- Save room specifications
- Email results to clients or self
- Adjust room type and adjacent room conditions

## Recent user reviews (10 of 11)

All indexed reviews: https://appshunter.io/ios/app/radiator-calculator/id1445426217/reviews.md

### 5/5 — Brilliant

*2025-05-21*

Easy to use, and a very cheap price. Thanks 👍

### 4/5 — Good app

*2024-08-15*

It’s a great app but needs updating to include addition wall and ceiling heat loss values then it will be even better. Please update 🤞

### 1/5 — Not work

*2022-12-06*

I tried to calculate my bedrooms and all needs 16 btu. This app is joke. Don't buy it.

**Developer response:** Hi, sorry it’s not working for you. There was a temporary glitch with our server that was causing the problem you experienced but it should be ok now if you want to try again. Get in touch through the app settings button if you’d prefer a refund.

Thanks!

### 1/5 — Can only do delta 50

*2022-06-02*

Sorry, but this is no good for the new building registration part L, It needs to at least adjust to delta 35, this app will be useless for new installs after the 15/6/2022, it can still work out the heat loss for older existing installations designed on a 75oC flow rate.

**Developer response:** Hi, thanks for the feedback. I’ve released an update (v1.3) where you can now switch to a DeltaT of 35c in the settings menu (tap the cog icon).

If you enjoy the app I’d appreciate you rating it again as low ratings make a difference to my sales.

Thanks
Tony

### 1/5 — Internet

*2021-05-10*

App saying no internet or 4g found even though I have full internet connection.

### 3/5 — Good, solid, but not perfect

*2020-09-29*

Good app. Really easy to use. It could just do with the option to edit room names, so when I need to know which rad gos in which bedroom, for instance, I won’t have to redo the calculations.

**Developer response:** Hi, glad you like the app. Before you tap the save button on the results screen you can tap the name to edit it and give it a more useful name. I’ll look into a way of editing the names after they’ve been saved too. Thanks, Tony

### 4/5 — Great app

*2020-08-21*

Better if you could enter measurements rather than the sliders.

### 5/5 — Awesome

*2020-08-13*

I truly enjoyed it & managed to make my calculations

### 1/5 — Pointless app

*2020-06-07*

You can not get a full heat design for the entire house, you can only do each individual room. It takes a lot of time and effort copying and pasting the emailed report and then you have to manually type the BTU requirement in. Waste of money free ones online Tommie a better job

### 5/5 — Great

*2019-04-17*

Really useful app.

## Frequently asked questions about Radiator Calculator

### What is the price of Radiator Calculator?

Radiator Calculator is a paid app priced at $1.99. This one-time purchase grants you full access to all its features without any additional costs or subscriptions.

### Does Radiator Calculator have ads?

No, Radiator Calculator does not contain advertisements. The app is ad-free, providing an uninterrupted user experience for all calculations.

### What devices is Radiator Calculator compatible with?

Radiator Calculator is available for iPhone, iPad, and iPod touch devices. It is designed to run on Apple's iOS ecosystem.

### How often is Radiator Calculator updated?

The app was last updated on June 18, 2023, with version 1.4. Updates typically include feature enhancements and bug fixes to improve performance and reliability.

### What is the age rating for Radiator Calculator?

Radiator Calculator has an age rating of 4+. This indicates it is suitable for users of all ages, with no mature content.

### Can I save my room calculations with Radiator Calculator?

Yes, you can save room details and their calculated results for later use within the Radiator Calculator app. This allows you to revisit or manage multiple projects easily.

### What user sentiment is reported for Radiator Calculator?

Radiator Calculator has received excellent user feedback, indicated by a high rating of 4.8 stars from 4 ratings. Users appreciate its accuracy and ease of use for determining radiator sizes.

### Can Radiator Calculator be used for different measurement units?

Yes, Radiator Calculator allows you to easily switch between Feet and Metres for room dimensions. This flexibility ensures it can be used in various regions and by different users.

## Version history (last 5 releases)

### 1.4 — 2023-06-18

- Bug fixes to fix issues with failed BTU calculation result
- Update to recent iOS

### 1.3 — 2022-06-07

Bug fixes:
- Fix square-feet conversion (thanks to Charles)
- Added ability to toggle Delta-T between 35c and 50c in the settings menu

### 1.2 — 2022-04-30

Updated to iOS 15
Faster startup time

### 1.1 — 2020-06-26

Added BTU result when emailing the room information (thanks to Terry for the suggestion)
iOS 13 support
Faster start-up

### 1.0 — 2018-12-12

No release notes.

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## More apps by Physmo

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- [Mos Speedrun 2](https://appshunter.io/ios/app/mos-speedrun-2/id835098788)
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All apps by Physmo: https://appshunter.io/developer/333188621

## Related topics

[radiator calculator](https://appshunter.io/ios/topics/radiator-calculator) · [radiator size calculator](https://appshunter.io/ios/topics/radiator-size-calculator) · [radiator calculator pro](https://appshunter.io/ios/topics/radiator-calculator-pro) · [radiatoroutput](https://appshunter.io/ios/topics/radiatoroutput) · [radiator](https://appshunter.io/ios/topics/radiator)

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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 2026-09-08.*