1RM Calculator
1RM Calculator is made and published by Yuri Koshiishi. AppBrain is an independent app data site and isn't affiliated with Yuri Koshiishi. The app name, icon, screenshots and description belong to Yuri Koshiishi and are shown as published on the App Store.
AppBrain's verdict
EstablishedLoved by users- Rating on App Store
- 4.88
- 123 ratings
- Last updated
- October 5, 2026
- Size
- 27.6 MB
Users love it: 4.9 stars from 123 ratings.
User feedback
Ratings and reviews on the App StoreComments on 1RM Calculator for iOS
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Store listing
By Yuri Koshiishi, from the App Store
Description by Yuri Koshiishi Written by the developer, not by AppBrain. Click to read.
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/
Safety and technology
Found in the app by AppBrain- Price
- Free
- App size
- 27.6 MB
- Content rating
- Everyone
Technologies used by 1RM Calculator
Releases
Updates seen on the App Store- Version
- 1.8.0
- Launched
- May 2021
No changelog data
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Rankings
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About the app and developer
About 1RM Calculator
1RM Calculator is a health & fitness app developed by Yuri Koshiishi.
What is the rating of 1RM Calculator?
1RM Calculator is rated 4.88 out of 5 stars, based on 120 ratings.
Is 1RM Calculator free?
1RM Calculator is free. The app size is 27.59 MB. The latest version available is 1.8.0. The last update was on October 5, 2026.
What are the requirements for 1RM Calculator?
The app has a content rating of Everyone. The app has been available on the App Store since May 2021.
Developer information for Yuri Koshiishi
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