Health and Fitness Calculators Online

I built these free online calculators and tools to be as straightforward as possible. No signups, no paywalls, and no lectures. Here’s what you’ll find on this site:

A friendly illustration of a person and a weight scale, representing the BMI & BMR Calculator. It helps you understand your body mass and how many calories you burn just by existing.
BMI & BMR Calculator
Instantly check your Body Mass Index and Basal Metabolic Rate. BMI is a quick way to see if your weight is in a healthy range for your height, while BMR tells you how many calories you’d burn if you just chilled all day.

A simple drawing of a torso with a measuring tape around the waist, symbolizing the Body Fat Calculator. It\
Body Fat Calculator
Want to know your body fat percentage? This tool uses the U.S. Navy method, which is surprisingly accurate for a tape-measure approach. It’s a great way to track progress beyond just the scale. Learn more about body fat at ACE Fitness.

An illustration of a stylized flame, representing the Calorie Needs Calculator. This tool helps you figure out your daily calorie needs to maintain, lose, or gain weight.
Calorie Needs Calculator
Figure out how many calories you need each day to maintain, lose, or gain weight. This calculator uses your stats and activity level to estimate your daily calorie needs..

A colorful pie chart with icons for banana, chicken leg, and a drop, illustrating the Macro Split Calculator. It\
Macro Split Calculator
Macros—protein, carbs, and fat—are the building blocks of your diet. This tool helps you figure out the right split for your goals, whether you’re going balanced, low-carb, high-protein, or keto. For more on macros, see EatRight.org.

A friendly illustration of a stopwatch with motion lines, symbolizing the Stopwatch Tool. Perfect for timing your workouts, sprints, or even just your coffee breaks.
Stopwatch Tool
Time your workouts, sprints, or even your coffee breaks. Simple, accurate, and always ready—no app download required.

A cute illustration of a timer, representing the Timer Tool. Great for setting intervals for HIIT, Tabata, or just making sure you don’t burn your eggs!
Timer Tool
Set a timer for your next set, break, or anything else. Great for HIIT, Tabata, or just making sure you don’t burn your eggs.

If you’re new to fitness, don’t stress about getting everything perfect. Use these calculators as a starting point, and adjust as you go. If you’re a pro, you’ll appreciate the speed and simplicity. Either way, I hope you find this site useful. If you have ideas for new tools or spot something that could be better, let me know. I’m always looking to improve.

This site is for anyone who wants to take control of their health, whether you’re just starting out (like me), getting back into shape, or you’re a seasoned gym regular who just wants a quick check-in. I’m not a doctor or a personal trainer, but I do care about making health info accessible and easy to use. I use science-backed formulas and keep things updated as new research comes out. If you spot a bug or have feedback, drop me a message.

Thanks for stopping by, and good luck on your health journey—whether you’re just getting started or you’re already crushing it.

FAQ


  • Are your calculators accurate? The calculators on this site provide estimates. If you’re a bodybuilder, pro athlete, or have a unique medical situation, take these numbers with a grain of salt. For medical advice, talk to a real doctor.
  • Do you store my data? No. Everything is calculated in your browser. I don’t store, sell, or share your info. See the Privacy Policy for details.
  • Why do you have ads or affiliate links? To keep this site free while paying for expenses, I use ads and affiliate links. If you click and buy, I may earn a small commission (at no extra cost to you). See the Ad Policy and Affiliate Disclaimer.
  • What about cookies? This site uses cookies for analytics, ads, and affiliate tracking. You can read more in the Privacy Policy.
  • Can I contact you? Yes! Head over to the Contact page and drop me a message.
  • Do you have other calculators? Yes! Check out the menu for Body Fat Calculator, Calorie Needs Calculator, Macro Split Calculator, Stopwatch Tool, and Timer Tool.
A friendly illustration of a person and a weight scale, representing the BMI & BMR Calculator. It helps you understand your body mass and how many calories you burn just by existing.
A simple drawing of a torso with a measuring tape around the waist, symbolizing the Body Fat Calculator. It's a neat way to track your body fat percentage beyond just the scale.
An illustration of a stylized flame, representing the Calorie Needs Calculator. This tool helps you figure out your daily calorie needs to maintain, lose, or gain weight.
A colorful pie chart with icons for banana, chicken leg, and a drop, illustrating the Macro Split Calculator. It's designed to help you balance your protein, carbs, and fats for your dietary goals.
A friendly illustration of a stopwatch with motion lines, symbolizing the Stopwatch Tool. Perfect for timing your workouts, sprints, or even just your coffee breaks.
A cute illustration of a timer, representing the Timer Tool. Great for setting intervals for HIIT, Tabata, or just making sure you don’t burn your eggs!