About fitanyx

A Smarter Way to Answer: “How Long Will It Take to Lose Weight?”

fitanyx was born from a simple question almost everyone who starts a fitness journey asks: “How long will it take to lose X pounds?”

Like many people, I tried guessing timelines, plugging numbers into generic calorie calculators, and hoping the results would make sense. But I quickly realized most tools were either too simplistic or too optimistic. They didn’t account for how metabolism, body composition, or adaptation actually change over time.

So I decided to build something different.

What is fitanyx?

fitanyx is a science-based weight loss time calculator. It's a tool designed to estimate how long it will take to reach your goal weight based on real physiology, not wishful thinking.

By combining your personal data (sex, age, height, weight, body fat, and activity level) with your daily calorie intake and exercise habits, fitanyx simulates your body’s metabolism day by day.

It’s not just a calorie deficit calculator, it’s a weight loss predictor that adapts as your body changes, helping you set realistic expectations and stay motivated for the long run.

Why I Built It

I originally created fitanyx for myself.
I wanted to know what was actually realistic for my body and not just a random “you’ll lose 2 pounds a week” guess.

I wanted a fitness goal tracker that could:

• Predict how long it might take to reach my goal weight.
• Show what my weight loss timeline could look like.
• Help me experiment with different calorie intakes or exercise routines and instantly see how they change my results.

After sharing it with friends, I realized that a lot of people were looking for the same thing: a body transformation tracker that’s based on real data, not hype.

That’s when fitanyx became more than just a personal project.

How It Works

fitanyx uses a scientifically grounded model that simulates:

• Your Resting Metabolic Rate (RMR)
• Total Daily Energy Expenditure (TDEE)
• Changes in fat mass and lean mass over time
• The effects of activity level, exercise, and even thermogenic supplements

By combining these factors, the calculator can estimate your fat loss timeline and visualize how your body weight could change week by week.

You can adjust your inputs like calories, activity, or protein and watch how your weight-goal predictor updates in real time.

What Makes fitanyx Different

Most weight loss calculators only tell you how many calories to eat.
fitanyx tells you how long it will take to get where you want to be and shows what that journey might actually look like.

It bridges the gap between a fitness progress app and a metabolic model, helping you stay realistic, consistent, and motivated.

Here’s what makes it unique:

• Science-based modeling (not “quick fix” math)
• Interactive charting of your projected weight loss timeline
• Fully customizable inputs for diet, exercise, and activity
• Metric and imperial support
• Instant updates as you tweak your plan

Built for Real People, Not Perfection

fitanyx isn’t about chasing unrealistic deadlines.
It’s about understanding your body, setting achievable goals, and tracking meaningful progress.

Everyone’s metabolism is different, but knowledge is power and having a clear picture of what’s possible can make all the difference between burning out and staying consistent.

Whether you’re just getting started, coming back after a break, or fine-tuning your nutrition plan, fitanyx helps you map out your path clearly, realistically, and scientifically.

Join the Journey

fitanyx started as a tool I needed for myself. Now, it’s for anyone who wants to plan their transformation with precision, not guesswork.

Try the fitanyx - Fat Loss Time Calculator and discover how long it could take you to reach your goal weight at your own pace, with data you can trust.

And if you want deeper insights, tips, and science-backed guides, explore the fitanyx blog where we break down the latest research in fat loss, nutrition, and training.