1RM Calculator1.8.0 - App Store
You'll be able to see results in few seconds.
Publisher Description
Estimate your one rep max (1RM) from any set. Enter the weight and reps you lifted, add RPE if you track it, and get your estimated max in seconds.
FEATURES
- 1RM calculator with optional RPE: reps left in the tank are counted, so 10 reps at RPE 7 is treated like a 13-rep max
- Transparent formulas: your estimate is the average of Epley, Brzycki (up to 12 reps), Wathan, and Mayhew
- Estimated rep maxes from 2 to 12 reps, each shown as a percentage of your 1RM, for planning working sets
- Save results to your history by exercise, including your own custom exercises
- Edit or backdate saved records
- Export your history as CSV
- kg or lbs, light or dark theme
- 9 languages
- No account needed: your records stay on your device
PRO
- 1RM progress chart for each exercise
- Rep max table with your best recorded set for each rep count
- No ads
Pro is available as a monthly or yearly subscription, or as a one-time lifetime purchase. Subscriptions renew automatically until canceled in your store account settings.
Your 1RM is an estimate, not a tested max. Estimates are most reliable at lower reps.
Terms: https://1rm.workoutwise.app/legal/terms/
Privacy Policy: https://1rm.workoutwise.app/legal/privacy-policy/
Version History - Training weights: Calculate working weights from a % of your 1RM or RPE, and see which plates to load on the bar.
- Tap your 1RM estimate to see how it was calculated and how reliable it is.
- Tap any record in History to see its estimated rep maxes. 1.8.0 Oct 5 - A new design: results update as you type, and RPE, unit, and formula settings are together in Calculator options.
- The exercise list shows your best 1RM, with cleaner history, chart, and rep max screens.
- Restore now tells you when no purchase is found.
- Fixed the Wathan and Mayhew formulas shown in About calculation. 1.7.1 Sep 29 - Expanded language support: French, Portuguese, German, Italian, Russian, Korean. 1.6.2 02/12/2025 - Added a search input to filter exercises.
- Added a chart to show 1RM progress over time.
- Added a table to show rep maxes for each lift. 1.6.1 02/07/2025 - Minor improvements & bug fixes. 1.4.0 10/25/2024 - Improved 1RM calculation logic.
- Added Spanish language support. 1.3.2 04/30/2024 - Enhanced stability and security. 1.3.1 12/28/2023 - Added RPEs with decimals.
- Improved 1RM calculation logic. 1.3.0 08/28/2023 - Added a feature to display a notification when 1RM is saved.
- Updated Screenshots. 1.2.1 06/12/2022 - Added a feature to delete an exercise.
- Added a feature to post a review.
- Fixed some texts. 1.1 05/10/2022 1.0 05/10/2021
About 1RM Calculator
The company that develops 1RM Calculator is Yuri Koshiishi. The latest version released by its developer is 1.8.0.
To install 1RM Calculator on your iOS device, just click the green Continue To App button above to start the installation process. The app is listed on our website since 2026-10-14 and was downloaded 0 times. We have already checked if the download link is safe, however for your own protection we recommend that you scan the downloaded app with your antivirus. Your antivirus may detect the 1RM Calculator as malware if the download link is broken.
How to install 1RM Calculator on your iOS device:
- Click on the Continue To App button on our website. This will redirect you to the App Store.
- Once the 1RM Calculator is shown in the iTunes listing of your iOS device, you can start its download and installation. Tap on the GET button to the right of the app to start downloading it.
- If you are not logged-in the iOS appstore app, you'll be prompted for your your Apple ID and/or password.
- After 1RM Calculator is downloaded, you'll see an INSTALL button to the right. Tap on it to start the actual installation of the iOS app.
- Once installation is finished you can tap on the OPEN button to start it. Its icon will also be added to your device home screen.
Program Details
System requirements
Download information
Pricing
Version History
version 1.8.0
posted on 2026-10-14
Version History - Training weights: Calculate working weights from a % of your 1RM or RPE, and see which plates to load on the bar.
- Tap your 1RM estimate to see how it was calculated and how reliable it is.
- Tap any record in History to see its estimated rep maxes. 1.8.0 Oct 5 - A new design: results update as you type, and RPE, unit, and formula settings are together in Calculator options.
- The exercise list shows your best 1RM, with cleaner history, chart, and rep max screens.
- Restore now tells you when no purchase is found.
- Fixed the Wathan and Mayhew formulas shown in About calculation. 1.7.1 Sep 29 - Expanded language support: French, Portuguese, German, Italian, Russian, Korean. 1.6.2 02/12/2025 - Added a search input to filter exercises.
- Added a chart to show 1RM progress over time.
- Added a table to show rep maxes for each lift. 1.6.1 02/07/2025 - Minor improvements & bug fixes. 1.4.0 10/25/2024 - Improved 1RM calculation logic.
- Added Spanish language support. 1.3.2 04/30/2024 - Enhanced stability and security. 1.3.1 12/28/2023 - Added RPEs with decimals.
- Improved 1RM calculation logic. 1.3.0 08/28/2023 - Added a feature to display a notification when 1RM is saved.
- Updated Screenshots. 1.2.1 06/12/2022 - Added a feature to delete an exercise.
- Added a feature to post a review.
- Fixed some texts. 1.1 05/10/2022 1.0 05/10/2021
version 1.8.0
posted on 2026-10-06
Version History - Training weights: Calculate working weights from a % of your 1RM or RPE, and see which plates to load on the bar.
- Tap your 1RM estimate to see how it was calculated and how reliable it is.
- Tap any record in History to see its estimated rep maxes. 1.8.0 1d ago - A new design: results update as you type, and RPE, unit, and formula settings are together in Calculator options.
- The exercise list shows your best 1RM, with cleaner history, chart, and rep max screens.
- Restore now tells you when no purchase is found.
- Fixed the Wathan and Mayhew formulas shown in About calculation. 1.7.1 Sep 29 - Expanded language support: French, Portuguese, German, Italian, Russian, Korean. 1.6.2 02/12/2025 - Added a search input to filter exercises.
- Added a chart to show 1RM progress over time.
- Added a table to show rep maxes for each lift. 1.6.1 02/07/2025 - Minor improvements & bug fixes. 1.4.0 10/25/2024 - Improved 1RM calculation logic.
- Added Spanish language support. 1.3.2 04/30/2024 - Enhanced stability and security. 1.3.1 12/28/2023 - Added RPEs with decimals.
- Improved 1RM calculation logic. 1.3.0 08/28/2023 - Added a feature to display a notification when 1RM is saved.
- Updated Screenshots. 1.2.1 06/12/2022 - Added a feature to delete an exercise.
- Added a feature to post a review.
- Fixed some texts. 1.1 05/10/2022 1.0 05/10/2021
version 1.7.1
posted on 2026-10-03
Version History - A new design: results update as you type, and RPE, unit, and formula settings are together in Calculator options.
- The exercise list shows your best 1RM, with cleaner history, chart, and rep max screens.
- Restore now tells you when no purchase is found.
- Fixed the Wathan and Mayhew formulas shown in About calculation. 1.7.1 3d ago - Expanded language support: French, Portuguese, German, Italian, Russian, Korean. 1.6.2 02/12/2025 - Added a search input to filter exercises.
- Added a chart to show 1RM progress over time.
- Added a table to show rep maxes for each lift. 1.6.1 02/07/2025 - Minor improvements & bug fixes. 1.4.0 10/25/2024 - Improved 1RM calculation logic.
- Added Spanish language support. 1.3.2 04/30/2024 - Enhanced stability and security. 1.3.1 12/28/2023 - Added RPEs with decimals.
- Improved 1RM calculation logic. 1.3.0 08/28/2023 - Added a feature to display a notification when 1RM is saved.
- Updated Screenshots. 1.2.1 06/12/2022 - Added a feature to delete an exercise.
- Added a feature to post a review.
- Fixed some texts. 1.1 05/10/2022 1.0 05/10/2021
version 1.6.2
posted on 2026-09-26
Version History - Expanded language support: French, Portuguese, German, Italian, Russian, Korean. 1.6.2 02/12/2025 - Added a search input to filter exercises.
- Added a chart to show 1RM progress over time.
- Added a table to show rep maxes for each lift. 1.6.1 02/07/2025 - Minor improvements & bug fixes. 1.4.0 10/25/2024 - Improved 1RM calculation logic.
- Added Spanish language support. 1.3.2 04/30/2024 - Enhanced stability and security. 1.3.1 12/28/2023 - Added RPEs with decimals.
- Improved 1RM calculation logic. 1.3.0 08/28/2023 - Added a feature to display a notification when 1RM is saved.
- Updated Screenshots. 1.2.1 06/12/2022 - Added a feature to delete an exercise.
- Added a feature to post a review.
- Fixed some texts. 1.1 05/10/2022 1.0 05/10/2021
version 1.6.2
posted on 2025-02-12
Feb 12, 2025
Version 1.6.2
- Expanded language support: French, Portuguese, German, Italian, Russian, Korean.
version 1.6.2
posted on 2025-02-12
- Expanded language support: French, Portuguese, German, Italian, Russian, Korean.
version 1.4.0
posted on 2024-10-25
Oct 25, 2024
Version 1.4.0
- Minor improvements & bug fixes.
version 1.3.2
posted on 2024-04-30
Apr 30, 2024
Version 1.3.2
- Improved 1RM calculation logic.
- Added Spanish language support.
version 1.3.1
posted on 2023-12-28
Dec 28, 2023
Version 1.3.1
- Enhanced stability and security.
version 1.3.0
posted on 2023-08-28
Aug 28, 2023
Version 1.3.0
- Added RPEs with decimals.
- Improved 1RM calculation logic.
Disclaimer
Official App Store Link
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