# One Rep Max Calculator Calculate your estimated one repetition maximum (1RM) for weightlifting > Canonical page: https://elysiatools.com/en/tools/one-rep-max - **Category:** Health - **Keywords:** 1rm, one rep max, strength, weightlifting, calculator, fitness ## Overview The One Rep Max (1RM) Calculator helps weightlifters and athletes estimate their maximum strength capacity for a single repetition based on submaximal lifting performance. By inputting the weight lifted and the number of repetitions performed, you can accurately gauge your progress and structure your training intensity without the physical strain of attempting a true one-rep maximum lift. ## Inputs - **Weight Lifted (kg)** (number): Enter weight lifted - **Repetitions** (number): Enter number of reps - **Formula** (select) ## When to use - When you want to determine your strength baseline without performing a risky maximal effort lift. - When you are following a strength training program that requires percentage-based loading. - When you need to track your strength gains over time during a hypertrophy or powerlifting cycle. ## How it works - Enter the weight you successfully lifted in kilograms. - Input the total number of repetitions you completed with that weight. - Select your preferred calculation formula (Epley, Brzycki, or Lander) to generate the estimate. - View your calculated 1RM to adjust your future training sets and intensity. ## Use cases - Setting target weights for upcoming strength training blocks based on percentage-based programming. - Monitoring progress during a powerlifting peaking phase to ensure strength is trending upward. - Calculating appropriate warm-up and working set weights for gym sessions. ## Frequently asked questions ### What is a One Rep Max? A One Rep Max (1RM) is the maximum amount of weight you can lift for a single repetition of a specific exercise with proper form. ### Why use a calculator instead of testing my 1RM? Calculating your 1RM reduces the risk of injury associated with lifting maximal loads and allows you to estimate strength capacity during regular training sessions. ### Which formula should I choose? Epley is widely used for general strength, Brzycki is often preferred for its simplicity, and Lander is frequently used for heavier loads; all provide reliable estimates. ### Is this calculator accurate for all exercises? It is most accurate for compound movements like squats, deadlifts, and bench presses, but accuracy decreases as the number of repetitions increases beyond 10. ### Can I use this for bodyweight exercises? 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