Disclaimer
Last updated: September 4, 2026
1. Fitness and Health Information Disclaimer
1.1 Not Medical Advice
Everything on this site, including calculator results, guides, articles, and strength standards, is provided for informational and educational purposes only. None of it constitutes medical advice, clinical diagnosis, or professional fitness prescription. It is not a substitute for guidance from a licensed physician, physical therapist, certified strength and conditioning specialist (CSCS), or other qualified professional.
If you have an existing injury, medical condition, cardiovascular concern, or any health situation that may affect your ability to train safely, consult a qualified professional before beginning or modifying any exercise program. Do not disregard professional medical advice because of something you read on this site.
1.2 Individual Results Vary
Strength performance, training progress, and injury risk differ between individuals. Factors including age, training experience, genetics, body composition, health status, sleep, nutrition, and recovery all affect what any individual lifter can safely do and achieve. No result, standard, or benchmark shown on this site should be taken as a personal prediction, guarantee, or target that applies to everyone.
1.3 Exercise Involves Risk
Strength training carries inherent physical risk. Maximal and near-maximal efforts, including one-rep max testing, carry a higher risk of injury than submaximal training. This site strongly recommends a structured warm-up before any heavy lifting, qualified coaching for anyone new to barbell training, appropriate safety equipment (power rack, safety pins, collars), and a spotter for all heavy bench press and squat attempts.
This site and its author accept no liability for any injury, loss, or damage resulting from the application of information or calculator results found here. By using this site, you accept full responsibility for your own safety and training decisions.
2. Calculator Accuracy Disclaimer
2.1 Estimated Results Only
All 1RM estimates produced by the calculator on this site are mathematical predictions. They are based on established estimation formulas, including Epley (1985), Brzycki (1993), Lander (1985), Lombardi (1989), Mayhew (1992), O’Conner (1989), and Wathan (1994). They are not direct physical measurements.
Your actual one-rep max depends on technical form, accumulated fatigue, equipment used, testing conditions, time of day, and training history. No formula fully accounts for all of these variables. Treat every estimate as a working approximation, not a definitive number.
2.2 Formula Limitations
Each formula in this calculator was built from a specific dataset of lifters, tested under specific conditions. No single formula performs equally well across all rep ranges, training ages, and exercises. Estimates from input sets above 10 reps are less reliable across all formulas because muscular endurance starts to influence the result more than raw maximum strength does.
Use estimates from 3 to 5 rep input sets where possible. Run the calculator across multiple formulas and treat the spread as your confidence range rather than picking one number as definitive.
2.3 Not a Substitute for Proper Testing
For competitive powerlifters, strength athletes, or anyone who needs a verified maximum for competition or clinical assessment, a supervised testing session following a structured protocol is the appropriate standard. The calculator on this site supports training planning and programming. It does not replace a properly executed, supervised max attempt.
3. Content Accuracy and Updates
3.1 Best Efforts to Be Accurate
The guides and articles on this site are written using published research from recognized sources, including the NSCA, ACSM, and peer-reviewed sports science literature, alongside established coaching frameworks and practical training experience. We make every reasonable effort to ensure the information is accurate at the time of writing.
Exercise science evolves. An article published today may not reflect the most current research by the time you read it. Where possible, we update older content, but we cannot guarantee that every page on the site reflects the most recent available evidence at all times.
3.2 No Warranty of Completeness
This site makes no warranty, express or implied, that its content is complete, current, or free of errors. All information is provided “as is” for general educational use. Readers are encouraged to cross-reference content with qualified coaches, certified professionals, and current literature before making significant training decisions based on what they read here.
4. External Links Disclaimer
This site links to external resources, including ExRx.net, Symmetric Strength, the NSCA, the ACSM, and other reference sources. These links are provided as a convenience to readers. We do not control, endorse, or take responsibility for the content, accuracy, availability, or privacy practices of any external website. Following an external link means you are leaving this site and are subject to the policies of the destination site.
5. Advertising Disclaimer
This site displays third-party advertisements served by Google AdSense and, where applicable, other advertising networks, including Mediavine. The advertisements shown on this site are not created, reviewed, or endorsed by onerepmaxcalculators.com. Ad content is controlled entirely by the advertiser and the ad network. The presence of an advertisement on this site does not constitute a recommendation or endorsement of the advertised product or service.
6. Affiliate Links
Some links on this site may be affiliate links. If you click one of these links and make a qualifying purchase, this site may earn a small commission at no additional cost to you. Affiliate relationships do not influence the editorial content of this site, including guides, calculator results, formula explanations, or strength standards. Recommendations are based on relevance and accuracy, not on commercial relationships.
This section will be updated with specific affiliate programs as partnerships are established.
7. Limitation of Liability
To the maximum extent permitted by applicable law, onerepmaxcalculators.com and its author, Michael Swan, accept no liability for any direct, indirect, incidental, consequential, or punitive loss or damage of any kind arising from your use of this site, its content, its calculator tools, or any third-party content linked from this site.
This includes but is not limited to physical injury from following training information, financial loss from decisions made based on content on this site, or any loss arising from reliance on calculator estimates. Use of this site constitutes acceptance of this limitation.
8. Contact
If you have questions about this disclaimer or want to report an inaccuracy, please use the contact form at https://onerepmaxcalculators.com/contact/ or email info@onerepmaxcalculators.com.