Understanding your calculation
Method, example and limitations
How the calculation works
A one-repetition maximum formula estimates the heaviest single repetition from a submaximal weight and repetition count. Different equations can produce different values.
Example to check
Under the Epley formula, 60 kg lifted for five repetitions estimates 60 × (1 + 5/30) = 70 kg.
Before using the result
A formula estimate is not proof that lifting that load is safe. Accuracy usually worsens with high repetition counts; technique, fatigue and exercise choice matter.