One Rep Max: 1RM Calculator
Charles Vanderhoff Health & Fitness iPhoneiPadiPod touch
One Rep Max: 1RM Calculator is a free Health & Fitness app for iPhone and iPad by Charles Vanderhoff. Rated 4.4/5 from 185 ratings. Requires iOS 15.0.
- Rating
- 4.4
- 185 ratings
- Price
- Free
- on the App Store
- Size
- 52 MB
- Age 4+
- Updated
- Sep 29
- 2026 · v4.0.24
Screenshots
About One Rep Max: 1RM Calculator
Stronger Training, Smarter Progress One Rep Max helps you safely and accurately determine your maximum lift potential for bench press, deadlift, squat, and any other strength exercise - without risking injury. Key Features: • Precise Calculations - 7 scientific formulas for accurate strength predictions: Epley, Brzycki, Lombardi, Mayhew, McGlothin, O'Conner, Wathan • RPE Integration - Factor in Rate of Perceived Exertion to fine-tune your max estimates based on how difficult sets feel • Custom Exercise Tracking - Create and monitor any lift that matters to you • Visual Progress - Beautiful graphs show your strength journey over time • Percentage Charts - Quick reference guide for training percentages • Goal Setting - Set targets and track your path to reaching them Perfect for: • Powerlifters optimizing their training cycles • CrossFit athletes tracking multiple movement patterns • Olympic weightlifters monitoring progress • Strength enthusiasts at any level Advanced Features: • Choose between multiple calculation formulas for different lift types • Track unlimited exercises with custom notes • Rate of Perceived Exertion (RPE) - Fine-tune your 1RM estimates based on how difficult sets feel • Analyze detailed statistics including volume and frequency • Set and monitor progress toward specific strength goals The Science Behind The Numbers: Our app employs multiple validated formulas to estimate your one-rep maximum based on your performance with submaximal weights. This provides you with safe strength targets before attempting potentially risky maximal lifts. Safety Note: Heavy weightlifting should always be performed with proper technique and appropriate spotting. This app provides estimates based on scientific formulas, but individual performance may vary based on experience level and training history. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Ratings & reviews
4.4
185 ratings
What’s new
Version 4.0.24 · Updated September 29, 2026
Stronger foundations for your strongest lifts. Upgraded to the latest iOS frameworks with refreshed sign-in. Your lifts and maxes carry right over. Go chase that next PR.
App privacy
The developer, Charles Vanderhoff, reported these privacy practices to Apple.
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Identifiers: Device ID
Data Linked to You
The following data, which may be collected and linked to your identity, may be used for the following purposes:
- Health & Fitness: Fitness
- Contact Info: Email Address
- Identifiers: User ID
Used for: App Functionality
Data Not Linked to You
The following data, which may be collected but is not linked to your identity, may be used for the following purposes:
- Identifiers: Device ID
- Usage Data: Product Interaction
- Diagnostics: Crash Data
Used for: Third-Party Advertising, Analytics
Alternatives to One Rep Max: 1RM Calculator
Looking for apps like One Rep Max: 1RM Calculator? Here are 6 similar apps on the App Store. The highest rated is 1RM Percentage Calculator (5.0/5), and all 6 are free to download.
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My 1 Rep Max
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1RM Calculator
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531 Strength
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Barbell Plate Calculator
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1RM Percentage Calculator
5.0
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Powerlift Pro
4.7
| App | Rating | Price | Last updated | Compare |
|---|---|---|---|---|
| One Rep Max: 1RM Calculator | 4.4 / 5 (185 ratings) | Free | September 29, 2026 | |
| My 1 Rep Max | 4.4 / 5 (119) | Free | Oct 12, 2026 | Compare |
| 1RM Calculator | 4.9 / 5 (122) | Free | Oct 5, 2026 | Compare |
| 531 Strength | 4.9 / 5 (11,642) | Free | Jan 11, 2026 | Compare |
| Barbell Plate Calculator | 4.8 / 5 (284) | Free | Jun 26, 2024 | Compare |
| 1RM Percentage Calculator | 5.0 / 5 (4) | Free | Jan 13, 2026 | Compare |
| Powerlift Pro | 4.7 / 5 (314) | Free | May 2, 2025 | Compare |