MyGymCalcTRACK . PROGRESS . GROW
Know Your Calories, Macros & Max Lift.
Free bodybuilding calculators that run in your browser. No sign-up, no tracking.
Calculators
All calculators
Each calculator shows the published formula it uses, explains the result in plain language and links to related tools.
Free Bodybuilding & Fitness Calculators
MyGymCalc is a collection of free bodybuilding calculators built for lifters who want fast, accurate numbers without the clutter. Whether you're trying to lose fat, build muscle, or just want to know how many calories you should eat a day, every tool here runs instantly in your browser, no sign-up, no ads blocking your results, and nothing you enter is ever stored or tracked.
What You Can Calculate
- Calorie Calculator. Our most popular tool. Find your daily calorie needs based on your age, weight, height, and activity level, then get maintenance, calorie deficit, and calorie surplus targets for weight loss, fat loss, or muscle gain. If you've ever searched "how many calories should I eat a day," this free calorie calculator gives you a personalized, formula-based answer in seconds.
- Macro Calculator. Once you know your calories, this macro calculator breaks them down into protein, carbs, and fat targets tailored to your goal, whether you're cutting, bulking, or maintaining.
- One-Rep Max (1RM) Calculator. Estimate your one-rep max from any weight and rep range, plus a full percentage table for programming your training.
- Protein Calculator. Get a daily protein target in grams based on your body weight, goal, and training experience.
- Body Fat Calculator. Estimate your body fat percentage and lean body mass using the US Navy method, just a tape measure and a few numbers.
Why Use MyGymCalc
- Free calorie calculator and macro tools, always. No paywalls, no locked results.
- No sign-up required. Get your numbers instantly and get back to training.
- Privacy-first. Every calculation, from your calorie deficit calculator result to your body fat estimate, runs entirely in your browser. Nothing is sent to a server or stored.
- Built on real formulas. We use established, published methods like Mifflin-St Jeor for calories, not guesswork, so the numbers you get are ones you can actually trust.
- Fast and distraction-free. Every gym calculator here loads quickly and works well on your phone, so you can check your numbers between sets.
Who These Calculators Are For
Whether you're a beginner figuring out your first calorie deficit calculator result, an experienced lifter tracking your macros through a bulk, or someone simply asking "how many calories should I eat a day" for the first time, MyGymCalc's free tools are built to give you a clear, personalized answer without the noise most fitness calculator sites bury you in.
FAQ
Are these calculators really free?
Yes. Every calculator on MyGymCalc, including the calorie calculator, macro calculator, and 1RM calculator, is completely free to use with no sign-up and no limits.
Do you store the information I enter?
No. Every calculation runs in your browser. Your weight, height, age, and results are never sent to our servers or stored anywhere.
Which calculator should I start with?
Most people start with the Calorie Calculator to find their daily calorie needs, then use the Macro Calculator to break that number down into protein, carbs, and fat.
How accurate are MyGymCalc's calculators?
Each tool uses established, published formulas (such as Mifflin-St Jeor for calories and the US Navy method for body fat). They provide reliable estimates for most people, though individual results can vary.