1RM Calculator

Name: 1RM Calculator
Rating: 4.9 (113 reviews)
Author: Yuri Koshiishi

One Rep Max & RPE Calculator

Free · In‑App Purchases · Designed for iPad. Not verified for macOS.

113 Ratings
Age Rating

4+
Years
Category

Health & Fitness
Developer

Yuri Koshiishi
Language

EN
English
Size

28.7
MB

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/

Ratings & Reviews

4.9

out of 5

113 Ratings

Cool Little App!
07/09/2022
Slink McDink
Haven‘t had this app very long, but it does what I need it to for myself and my clients. The lbs/kg option is nice, and the RPE is nice to have if you’re someone who uses RPE. I love being able to save my lifts on here as well.
Cool Little App!
07/09/2022
Slink McDink

Haven‘t had this app very long, but it does what I need it to for myself and my clients. The lbs/kg option is nice, and the RPE is nice to have if you’re someone who uses RPE. I love being able to save my lifts on here as well.
Awesome App
05/10/2024
Dawson Davenport
It helps me determine a path to strength growth without always using maximum weight which if not lifted strictly with a partner could injure me! At 68 years old injuries are not my friend!
Awesome App
05/10/2024
Dawson Davenport

It helps me determine a path to strength growth without always using maximum weight which if not lifted strictly with a partner could injure me! At 68 years old injuries are not my friend!
Nice But….
04/04/2025
Longtimelifter
Need to be able to change date of entry. I have some past lifts that I want to enter but can only enter as current date and don’t see where date of lift can be changed.
Nice But….
04/04/2025
Longtimelifter

Need to be able to change date of entry. I have some past lifts that I want to enter but can only enter as current date and don’t see where date of lift can be changed.
Good but
02/06/2025
GrumpyWolfdog
Lost all my data from last year 🙁
Good but
02/06/2025
GrumpyWolfdog

Lost all my data from last year 🙁

- 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.

Version 1.7.1 1d ago

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More

Accessibility

Information

Seller: Yuri Koshiishi
Size: 28.7 MB
Category: Health & Fitness
Compatibility: Requires iOS 15.0 or later.

iPhone
Requires iOS 15.0 or later.

iPad
Requires iPadOS 15.0 or later.

iPod touch
Requires iOS 15.0 or later.

Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.

Apple Vision
Requires visionOS 1.0 or later.
Languages: English
Age Rating: 4+

4+

Learn More

Contains
Advertising
In-App Purchases: Yes

1 Rep Max Pro Monthly $1.99

1 Rep Max Pro Annual $9.99

1 Rep Max Pro Lifetime $29.99

Learn More