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One-rep max estimate

Calculate one-rep max estimate with clear inputs and assumptions.

Calculate one-rep max estimate with clear inputs and assumptions.

Both dots and commas are accepted as decimal separators.

Your inputs stay in your browser. Displayed results are rounded to a maximum of 12 significant digits.

Method and assumptions

Method version 1.0.0 · Updated

Calculate

Formula: Calculate one-rep max estimate with clear inputs and assumptions.

Calculate one-rep max estimate with clear inputs and assumptions.

weight
Weight (kg)
reps
Repetitions

Results are estimates where noted and depend on the entered assumptions.

Calculate with code

These short examples use the same inputs and core calculation as this tool. Adapt validation and formatting to your application.

JavaScript
const weight = 100, reps = 5;
console.log(weight * (1 + reps / 30)); // Epley estimate: 116.67 kg
TypeScript
const weight = 100, reps = 5;
const oneRepMax: number = weight * (1 + reps / 30);
console.log(oneRepMax); // 116.67 kg estimate
Python
weight, reps = 100, 5
print(weight * (1 + reps / 30))  # 116.67 kg (Epley estimate)
Java
System.out.println(100 * (1 + 5 / 30.0)); // 116.67 kg estimate
C#
Console.WriteLine(100 * (1 + 5 / 30.0)); // 116.67 kg estimate