Disclaimer
Last updated: July 10, 2026
Not medical advice. Metal Strength is a fitness information tool. The strength tiers, percentiles, one-rep-max figures, calorie/macro targets, and body-fat estimates it produces are for general guidance only — they are not medical, health, nutrition, or professional training advice.
1. Estimates, not measurements
Strength standards are derived from population-based ratios and vary by exercise, sex, bodyweight, and age. One-rep-max values are calculated with established formulas (Epley, Brzycki, Lander, Lombardi, Mayhew, O'Conner, Wathan) and become less accurate at higher rep counts. Your real results may differ. Nothing here predicts what you can safely lift.
The macro (nutrition) and body-fat calculators are likewise population-formula estimates. Calorie, macronutrient, and body-composition figures vary with individual physiology and measurement error — they are not nutrition, dietetic, or medical advice. Consult a qualified professional before making significant changes to your diet.
2. Consult a professional
Always consult a qualified physician or healthcare provider before starting, changing, or intensifying any exercise program — especially if you have an injury, a medical condition, or any doubt about your fitness to train. Stop immediately and seek help if you feel pain, dizziness, or discomfort.
3. Train at your own risk
Resistance training, and attempting maximal or near-maximal lifts in particular, carries an inherent risk of serious injury. You are solely responsible for training within your limits, using correct technique, proper equipment, and appropriate safety measures (such as a spotter or safety bars). Never use a number from this app as a reason to attempt a lift you are not prepared for.
4. World records and reference data
Any world records, standards, or comparison data shown are compiled from publicly available sources, are approximate, and may be incomplete or out of date. They are provided for interest only.
5. No warranty
Metal Strength is provided "as is", without warranty of any kind, express or implied, including accuracy, fitness for a particular purpose, or uninterrupted availability.
6. Limitation of liability
To the fullest extent permitted by law, the developer of Metal Strength shall not be liable for any injury, loss, or damage of any kind arising from your use of, or reliance on, this app, this website, or the information they provide. By using Metal Strength you accept these terms.
7. Contact
Questions about this disclaimer? Reach us at [email protected].