How is my one rep max calculated?

The calculator uses the weight and reps you enter from a completed set to estimate the maximum weight you could lift for a single repetition. It applies a standard formula (like Epley or Brzycki) to provide an estimate, not an exact measurement.

Can I use this calculator for any exercise?

Yes, you can use it for any lift where you perform a set to near failure, such as bench press, squat, deadlift, or overhead press. The estimate is most accurate for compound lifts and when the set is performed with good form.

Is the one rep max estimate accurate?

The estimate is a good reference point but may vary from your actual 1RM due to factors like fatigue, technique, and muscle fiber composition. It's best used for planning training loads, not for predicting competition performance.

Fitness

Instantané, privé et gratuit

Calcul du 1RM.

15 oct. 2026

Votre 1RM et pourcentages d'entrainement

Cette calculatrice n'est pas encore entièrement traduite ; une partie du texte s'affiche en anglais.

Calcul sur l'appareilSans inscription

Saisissez vos valeurs

Les résultats se mettent à jour pendant la saisie.

02 / RÉPONSE

Formules multiples

Description formules multiples

Poids soulevé (lbs)

Répétitions complétées

Votre 1RM estimé

115.3 lbs

Plage: 112.5 - 119.0 lbs

Poids d'entraînement

95%

Proche du max(2 reps)

109.5 lbs

90%

Lourd(3-4 reps)

103.8 lbs

85%

Force(5-6 reps)

98.0 lbs

80%

Puissance(6-8 reps)

92.2 lbs

75%

Hypertrophie(8-10 reps)

86.5 lbs

70%

Endurance(10-12 reps)

80.7 lbs

65%

Léger(12-15 reps)

74.9 lbs

60%

Échauffement(15+ reps)

69.2 lbs

Niveau de force

Débutant

Accord de formule

±3.3 lbs

Confiance

Élevée

Lignes directrices de sécurité

Estimations
Précision
Échauffement
Forme

Conseils d'entraînement

Conseil 1
Conseil 2
Conseil 3
Conseil 4
Conseil 5

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Cite this calculator

Canonical URL: https://mathify.one/fr/fitness/one-rep-max

Updated 15 oct. 2026

Cite as: Mathify. (2026). Calcul du 1RM. https://mathify.one/fr/fitness/one-rep-max

Use Cases

Plan your training loads

Use your estimated 1RM to set appropriate weights for different rep ranges, such as 70-80% for hypertrophy or 85-95% for strength.

Example: If your estimated 1RM is 200 lbs, you might use 140-160 lbs for sets of 8-12 reps.

Track strength progress

Monitor your estimated 1RM over time to see if your strength is improving, even if you don't test a true one rep max.

Example: Compare your estimated 1RM from last month to this month to see gains.

Frequently Asked Questions

How is my one rep max calculated?: The calculator uses the weight and reps you enter from a completed set to estimate the maximum weight you could lift for a single repetition. It applies a standard formula (like Epley or Brzycki) to provide an estimate, not an exact measurement.
Can I use this calculator for any exercise?: Yes, you can use it for any lift where you perform a set to near failure, such as bench press, squat, deadlift, or overhead press. The estimate is most accurate for compound lifts and when the set is performed with good form.
Is the one rep max estimate accurate?: The estimate is a good reference point but may vary from your actual 1RM due to factors like fatigue, technique, and muscle fiber composition. It's best used for planning training loads, not for predicting competition performance.

Tips & Common Mistakes

Tips

For the most accurate estimate, use a weight you can lift for 2-10 reps with good form, leaving 1-2 reps in reserve.
Perform your set to near failure, but avoid going to absolute failure to reduce injury risk.
Use the same formula consistently when tracking progress to ensure comparisons are valid.
Re-test your estimated 1RM every 4-6 weeks to adjust your training loads.

Common Mistakes to Avoid

Using a weight that is too light (e.g., 20+ reps) can overestimate your 1RM.
Using a weight that is too heavy (e.g., 1-2 reps) may underestimate your 1RM due to fatigue or technique breakdown.
Not accounting for exercise type: the estimate is less accurate for isolation movements or exercises with a steep learning curve.

Last updated: August 13, 2026