Free Fitness Tools & Calculators
Calculate, plan, and track strength, nutrition, endurance, and recovery. Every tool is free to use without creating an account or entering an email address.
Not sure where to start? Take the QuizExplore Tools
Healthspan & Recovery
Body Fat Estimator
Calculate your estimated body fat percentage using the accurate U.S. Navy Method formula.
Daily Water Tracker
A native utility to track your daily hydration goals effortlessly. Works offline; syncs to your account when you sign in.
Mobility Routine Generator
Select a tight muscle group and instantly generate a 5-minute stretching routine to relieve tightness and improve range of motion.
Metabolic Health & Nutrition
TDEE & Macro Calculator
Calculate your Total Daily Energy Expenditure and get custom macronutrient targets for your goals.
Daily Macro Diary
A daily log to track your protein, carbs, and fats. Data stays on your device; syncs to your account when you sign in.
High-Protein Recipe Hub
A filtered database of healthy recipes specifically categorized by macros and active prep time.
Caloric Equivalent Converter
Select popular cheat meals and see exactly how much exercise time is required to burn them off.
Performance & Strength
1RM Calculator
Estimate your one-rep max, compare common formulas, and export practical training loads.
RPE & RIR Calculator
Translate reps in reserve into effort ratings and estimate load targets without testing a true max.
Training Volume Calculator
Add up sets, reps, load, and hard-set volume so you can compare sessions without guesswork.
Free 3-Day Strength Plan
Build a simple home or gym starter plan, then print or download it without creating an account.
Barbell Plate Calculator
Never do math at the gym again. Quickly calculate exactly which plates to load onto your barbell.
Daily Lifting Log
A distraction-free tracker to log your exercises, sets, reps, and weights. Works offline; syncs to your account when you sign in.
Wilks Score Calculator
Calculate your relative strength score to see how you stack up against other lifters regardless of bodyweight.
Program Templates
Battle-tested workout routines — Push/Pull/Legs, Upper/Lower splits, and a boot camp conditioning circuit you can load straight into your Daily Lifting Log.
Workout Rest Timer
A customizable countdown timer designed specifically for your rest periods between lifting sets.
Targeted Supplements
Supplement Database
An evidence-based directory of dietary supplements. Find out what works and what is just snake oil.
Neuro-Fitness & Science
Visual Exercise Library
A categorized index of exercises demonstrating proper form, text cues, and common mistakes.
Fitness Glossary
The ultimate reference dictionary for translating gym jargon, dietary terms, and training concepts.
Longevity & Endurance
Running Pace Calculator
Calculate pace and splits, compare distances, and export a practical race-day pace card.
Zone 2 Calculator
Estimate an easy aerobic heart-rate range with multiple methods and a talk-test cross-check.
VO₂ Max Calculator
Estimate aerobic fitness from a field test and understand the uncertainty behind the result.
Interval Timer
A programmable HIIT and Tabata timer that automatically loops between work and rest phases.
Science-Backed Wellness.
Evidence-based protocols on longevity, training, and recovery — every new article straight to your inbox, about twice a month. No fluff.