---
title: "One Rep Max Calculator — 1RM Epley, Brzycki, Training Percentages"
description: "Calculate your 1 rep max using 4 formulas (Epley, Brzycki, Lombardi, O'Conner). Get a full training percentage table for powerlifting and strength training."
url: "https://worldcalculators.org/calculators/one-rep-max/"
canonical: "https://worldcalculators.org/calculators/one-rep-max/"
---

# One Rep Max (1RM) Calculator

Calculate your 1 rep max using 4 formulas (Epley, Brzycki, Lombardi, O'Conner). Get a full training percentage table for powerlifting and strength training.

## Quick answer

Epley formula: 1RM = weight × (1 + reps/30). Lifting 80 kg for 8 reps = 80 × 1.267 = 101.3 kg estimated 1RM. For strength: train at 80–90% of 1RM for 3–5 reps. For hypertrophy: 70–80% for 6–12 reps. The International Powerlifting Federation (IPF) uses percentage-based programming; these formulas are universally applied across all countries with no national variation.

Source: https://worldcalculators.org/calculators/one-rep-max/
Markdown mirror of the HTML page. Prefer this URL for RAG; the interactive calculator still lives on the HTML page.