oneRM calculator (1RM)

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Everyone
50+
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Everyone
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About this app

You can estimate your 1RM based on the weight and reps you usually train with.

In addition to the basic 1RM calculation based on the Brzycki formula, this calculator also supports more detailed and accurate 1RM estimates for squat, bench press, and deadlift using NSCA-based formulas.

It also supports 1RM calculation for exercises that require bodyweight to be included, such as weighted pull-ups.
The simplest 1RM calculator with weighted pull-up calculation included
Updated on
May 14, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
  • No data shared with third parties
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  • No data collected
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What’s new

- Switched 1RM formula to Wathan with a 1RM-input exception.
- Inputs persist through rotation and background.
- Validation hints when inputs are missing or out of range.
- Tap Done on the keyboard to calculate.
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Everyone
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App support

About the developer
서한유
hu8232@naver.com
미사강변대로95 102 1102 하남시, 경기도 12917 South Korea