ARC
Fitness decisions, without the guesswork.
ARC is a mobile-first fitness calculator. Answer a few numbers, get a range you can act on, then open the next tool. Coaching is optional.
Calculators
Weight Loss Timeline Calculator
Estimate a week and date range to reach a goal weight using conservative weekly rates — not a promised deadline.
Calorie Deficit Calculator
Estimate maintenance with Mifflin-St Jeor, then compare 10–25% deficit scenarios. Default is 15%.
Protein Calculator
Get a daily protein range and a practical middle target, then split it across your meals.
Bulk, Cut, or Recomp
Answer a few questions and get a path to consider — cut, lean gain, or recomp — with a clear next tool.
1RM Calculator
Estimate a one-rep max from a 1–10 rep set using three formulas. The headline number is the median.
Optional coaching
If you want weekly adjustments and a coach, that still exists. The calculators do not require it.