1RM Calculator vs FFMI
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
1RM Calculator
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.
- 1RM calculation with RPE
- Rep max estimation
- Save 1RM history
- Customizable exercises
- Dark theme
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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/
FFMI
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Calculate and keep track of your Fat Free Mass Index (FFMI). Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is device support: 1RM Calculator at 3 against FFMI's 1. On price, update cadence, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. 1RM Calculator sells 3 in-app purchases, starting at $1.99 per month and FFMI sells 1 in-app purchase, starting at $0.99 per year. Whichever you choose, the download price is not the number that matters.
1RM Calculator ships an update every 4 months, FFMI every 3 months. The most recent releases landed on October 16, 2026 and October 3, 2026 respectively.
| Parameter | 1RM Calculator | FFMI |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (116 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 116 — better | — |
| Update frequency | Every 4 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 28 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Yuri Koshiishi | Almudena Blanco Morett |
In-app purchases
1RM Calculator
- 1 Rep Max Pro Monthly$1.991 Month
- 1 Rep Max Pro Annual$9.991 Year
- 1 Rep Max Pro Lifetime$29.99
FFMI
- Full Year Access$0.991 Year
