Muscle Building Calculators
Last updated: September 2026
Muscle Building Calorie Calculator
Calculates your daily calorie target for lean muscle gain by combining your Basal Metabolic Rate from the revised Harris-Benedict equation with your activity level and a 500-calorie muscle-building surplus.
Muscle Building Macro Calculator
Determine your daily protein target for building muscle from your body weight and training intensity, using the ISSN range of 1.6–2.2 g per kg (0.7–1.0 g per lb).
Hypertrophy Volume Calculator
Calculate the optimal number of weekly sets for a target muscle group based on your training experience, recovery capacity, and session frequency.
Muscle Gain Rate Calculator
Estimates how many pounds of muscle you can realistically gain per month based on your weight, age, gender, training experience, and diet quality.
Muscle Gain Timeline Calculator
Estimate how many pounds of lean muscle you can realistically gain over a chosen timeframe based on your experience level, genetic response, and training consistency.
One Rep Max Calculator
Predict your one-rep max (1RM) — the heaviest weight you could lift for a single perfect rep — from a recent set you actually performed.
Progressive Overload Planner
Projects the target working weight you should be lifting after a set number of weeks, accounting for your current load, rep targets, and training experience level.
Deload Week Calculator
Calculates how many weeks you should train before scheduling a deload, based on training intensity, weekly frequency, life stress, and sleep quality.
Muscle Fiber Type Calculator
Estimate whether your muscles are predominantly fast-twitch or slow-twitch using performance tests you can do today.
Strength to Size Ratio Calculator
Calculate how much strength you produce relative to your muscle size.