Free Fitness Calculators

Take the guesswork out of training with FITR’s free online tools. From tracking progress to planning workouts, our calculators deliver fast, science-backed results in just a few clicks. These web-based tools mirror the powerful FITR Calculators now built into both our Coach and Client apps—so you can train smarter, anywhere.

Rep converter

Find your one-rep max (1RM) quickly and easily.

Use our Rep Max Calculator to estimate the maximum weight you can lift for one repetition based on your recent performance. Perfect for strength programming, progressive overload, and tracking gains.

Try the Rep Max Calculator

Percentage Calculator

Find your ideal training weights quickly and accurately.

Enter your 1-rep max to view a full breakdown of working percentages from 100% down to 50%, perfect for strength programming and session planning.

Use the Percentage Calculator

Pace Calculator

Predict your run times with ease.

Enter your target pace per kilometer or mile to generate a 50-distance projection, including pace variations of -5 seconds and +5 seconds, ideal for race strategy and endurance training.

Use the Pace Calculator

Web only

Macros Calculator

Calculate your ideal daily macronutrient intake.

Whether your goal is fat loss, muscle gain, or maintenance, our Macros Calculator gives you tailored protein, carbs, and fat recommendations based on your body, goals, and activity level.

Use the Macros Calculator

Why Use FITR’s calculators?

Our calculators are built directly into the FITR Coach and Client apps, so you and your clients can access them anytime, anywhere. Here’s why they’re a powerful addition to your coaching toolkit:

Fast, accurate, and free to use.
Built on the Lombardy method of calculating.
Designed for lifters, coaches, and everyday athletes.
No sign-up required.

Whether you’re working with beginners or elite-level athletes, these tools are designed to enhance your coaching and deliver results faster.

More than just calculators

FITR is the ultimate platform for online fitness coaching. If you’re a coach or a serious trainee, check out our full features to manage programs, track progress, and grow your fitness business.

Boost your performance. Crush your goals. Use FITR’s fitness calculators today.

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