RTD & thermocouple calculations
About this app
Retherm is a simple application that converts resistances from RTD sensors to temperature. This app can currently convert Pt100, Pt500 and Pt1000 resistances to degree Celsius or Fahrenheit. The standard equations are done to the popular European/DIN standard for the temperature range of -200°C to +850°C with an average margin of error of about 0.02°C. An option is available for calculations to the less used American standard for the range 0 to 100°C with an average margin of error of about 0.2°C.
Retherm has the option to convert thermocouple voltages to degrees. The calculations are based on a 0°C reference junction temperature and use NIST polynomial values to make conversions. Types B, E, J, K, N, R, S and T are supported with outputs showing in both centigrade and Fahrenheit depending on your preference.
Retherm also features handy links to useful websites with vital information about RTD sensors.
This app is for built for quick reference use. There may be errors, although I try my best to make sure there are none. I, The application creator, will not be held liable for any problems caused due to errors within the application. If any problems are found, feel free to raise these via Codeberg.
This application is open source, available under the MIT license, and can be found at the following URL: https://codeberg.org/danb/retherm
Licensed under MIT, by Dan Brown.
What's New in v2.0.3
Imported from the F-Droid repository index.
- * Updated layout to avoid overlapping with system bars.
- * Updated styles to use light status bar to avoid issue with invisible status bar text.
Version history
Oct 12, 2025 · 5.2 MB · Android API 26–36 · code 8
Imported from the F-Droid repository index.
- * Updated layout to avoid overlapping with system bars.
- * Updated styles to use light status bar to avoid issue with invisible status bar text.
SHA-256 5c6d7eda268d9b5cc4770bf449e408be1865c0bc87171425e4a3bd469adb0188
Will it run on your device?
78%
- Runs on a broad range of modern Android versions.
- ABI coverage is focused on newer 64-bit devices.
- Aligned with the latest Android target SDK expectations.
Installation Guide
Open Settings on your Android device
Go to Security → Unknown sources (or Install unknown apps)
Enable "Allow from this source" for your browser or file manager
Open the downloaded APK file from your Downloads folder
Tap "Install" and wait for installation to complete
Launch the app from your home screen
Make sure to re-enable Unknown Sources restrictions after installation for security.
How to install this safely
How to verify the file you downloaded
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How to roll back to an earlier version
No earlier build is on record for Retherm, so there is nothing to roll back to yet. When a second version is published, this section will explain how to move between them safely.
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The official store channel is almost always the right choice: it updates automatically and carries the publisher's own distribution guarantees. A direct APK is useful when a device has no store access, when a rollout has not reached your region, or when you need a specific version — and only when the publisher has authorized that copy. APKBrowse does not list pirated, cracked, or unauthorized rebuilds of Retherm, and a listing is removed when the evidence for it stops holding up.
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Other sources
F-Droid listing
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Source code
verified publisherThe upstream repository this build is compiled from.
We check legality and signature continuity, but device behaviour still varies. Install at your own discretion.
App Information
Security Verification
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SHA-256 Hash
5c6d7eda268d9b5cc4770bf449e408be1865c0bc87171425e4a3bd469adb0188
Signing certificate
62b28e48e8c12afe020618ea4b0c10c9567540049b2556e6e8fdc963d68a200c
Permissions Required
What each permission lets Retherm do. A highlighted one is worth a second look — not necessarily wrong, just worth asking whether this app needs it.
Previous Versions
No earlier build is on record — this is the first release we have listed.
The signing certificate fingerprint for this release is on record, so a build that does not match it did not come from this publisher.
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