Best Rep Calculator Apps

250+ iOS apps curated and reviewed

4.6 avg rating
19 free apps
Updated August 2026

Out of 250+ rep calculator apps on iOS, 19 are free and the rest sit in the paid tier. This page sorts them so you can compare both sides before you commit.

Compare top Rep Calculator Apps (August 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1531 Strength531 StrengthFree4.9★ (12K)YesYesSep 2026
2My 1 Rep MaxMy 1 Rep MaxFree4.4★ (111)NoYesJul 2026
31RM Calculator1RM CalculatorFree4.9★ (109)NoYesSep 2026
4Rep ReserveRep ReserveFree4.7★ (14)NoYesAug 2026
5Rep Max CalculatorRep Max CalculatorFree5.0★ (3)NoYesAug 2026
6RepCount - Gym Workout TrackerRepCount - Gym Workout TrackerFree4.9★ (13K)NoYesSep 2026
71RM Calculator - One Rep Max1RM Calculator - One Rep MaxFree4.5★ (222)NoYesSep 2026
81 Rep Max Calc1 Rep Max CalcFree4.5★ (11)NoNoSep 2026

Top Picks for Rep Calculator

531 Strength#1

531 Strength by Henrik Jachobsen

Keep focus on your lifts
Editor's Choice
💪 Health & Fitness
4.9😊(12K ratings)
FreeAdsIn-App Purchases
531 Strength screenshot 1
531 Strength screenshot 2
531 Strength screenshot 3
531 Strength screenshot 4

This app simplifies tracking your progress on the 5/3/1 strength training program. It calculates and displays weights, reps, and sets based on your one-rep max, allowing you to easily plan and execute your workouts. Rounding options help match available gym plates.

What We Love

  • 🚀 Simple and efficient
  • 👍 Intuitive interface
  • 💪 Helps with strength gains
  • 🔧 Customizable features
  • ⏱️ Convenient timer
  • 📊 Tracking and progress logging

Room to Improve

  • 🔢 Inaccurate percentage calculations
  • 🗓️ Lack of ability to plan future workouts
  • 📋 Limited exercise tracking
  • 💰 Paid features not worth the cost
My 1 Rep Max#2

My 1 Rep Max by James T. Constant

1 Rep Max Calculator
Strong Contender
💪 Health & Fitness
4.4(111 ratings)
FreeIn-App Purchases
My 1 Rep Max screenshot 1
My 1 Rep Max screenshot 2
My 1 Rep Max screenshot 3
My 1 Rep Max screenshot 4
My 1 Rep Max screenshot 5

Estimate your one rep max weight for various lifts using popular formulas. Track your progress over time with a built-in logbook. Offers custom lift creation and extended repetition calculations with a premium upgrade.

1RM Calculator#3

1RM Calculator by Yuri Koshiishi

One Rep Max Strength
Worth Considering
💪 Health & Fitness
4.9(109 ratings)
FreeIn-App Purchases
1RM Calculator screenshot 1
1RM Calculator screenshot 2
1RM Calculator screenshot 3
1RM Calculator screenshot 4
1RM Calculator screenshot 5

Easily calculate your one-rep max (1RM) strength with this app. It supports RPE input and allows you to estimate rep maxes based on your 1RM. Track your progress by saving your 1RM history for different exercises.

More Rep Calculator apps to explore

FAQ about Rep Calculator

What are the best rep calculator apps for iPhone?
531 Strength tops our rep calculator apps ranking as of August 2026, with a 4.9-star average from 12K App Store ratings, and it's free to download.
Yes — 19 of the top rep calculator apps we rank are free to download, including 531 Strength and My 1 Rep Max.
531 Strength shows ads and offers in-app purchases, according to its App Store listing as of August 2026.
We track 250+ rep calculator apps on the iOS App Store as of August 2026, ranked by rating, recency, and analysis of real user reviews.
This app helps you follow the 5/3/1 strength training program by calculating the necessary weights, reps, and sets for each exercise based on your one-rep max (1RM). It provides a clear overview of your workout progression throughout the training cycle.
You input your current 1RM for each of the four main exercises. The app then uses this information to calculate the precise weights you should be lifting for each step of the 5/3/1 cycle. It also offers an option to round these calculated weights to match the plates you have available at the gym.

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