Bulk Comparison Calculator
Compare lean bulk vs dirty bulk outcomes. See projected muscle gain, fat gain, and body composition changes over 3, 6, and 12 months.
Free Weight Gain Calculators
6 toolsWeight gain plans, muscle gain timelines, and lean bulk calculators. Browse our free weight gain tools below — no sign-up required.
Child Growth Percentile Calculator
Calculate your child's weight, height, and BMI percentiles using WHO and CDC growth charts. Track growth from birth to age 20 with age and sex-matched comparisons.
Lean Bulk Calculator
Calculate optimal calories and macros for a lean bulk. Find your surplus, protein target, and projected muscle vs fat gain for clean bulking.
Muscle Gain Timeline Calculator
Estimate your muscle gain potential over time using the Lyle McDonald model. Year-by-year projection based on training experience and genetic factors.
Rehydration After Weigh-In Calculator
Estimate a post-weigh-in rehydration worksheet for combat-sport scenario planning, including fluid, sodium, and carbohydrate targets.
Weight Gain Plan Calculator
Calculate daily calorie surplus needed to gain weight safely. Plan your weight gain timeline with weekly targets for muscle building or underweight recovery.