Free tools

Fitness calculators

Quick, client-side estimators for strength, protein, and training volume. When you are ready to track meals and workouts, OptaFit is one signup away.

• 1RM calculator

  Estimate one-rep max with Epley and Brzycki, plus working-set loads from 50–95%.

• Protein intake optimizer

  Daily protein range and per-meal split from body weight, goal, and activity.

• Upper/Lower volume tracker

  Log weekly hard sets per muscle on Upper A/B and Lower A/B — flag under or over volume.

Looking for programming ideas? Browse workout guides at /guides.

OptaFit tools provide general estimates only. They are not medical, dietary, or fitness advice. Talk to a qualified professional before changing your diet or training.