Fitness & Health Calculators
Take control of your health journey with our comprehensive suite of free, instant-use calculators. Whether you're aiming to optimize your nutrition, track your fitness progress, plan a pregnancy, or understand key health metrics, these tools provide the accurate answers you need. Get clear, reliable results in seconds to make smarter decisions for your well-being.
BMI Calculator
Quickly determine your Body Mass Index to understand your weight status.
Body Fat Calculator
Estimate your body fat percentage for a more accurate picture of your body composition.
Macro Calculator
Find your optimal daily intake of protein, carbs, and fats to meet your goals.
Protein Calculator
Determine your specific daily protein needs for muscle gain, weight loss, or maintenance.
Carbohydrate Calculator
Calculate your daily carbohydrate needs to properly fuel your body and mind.
One Rep Max Calculator
Estimate your maximal strength for any lift to program your training effectively.
Pace Calculator
Calculate your running pace, finish time, or distance for training and race day.
Healthy Weight Calculator
Find your ideal healthy weight range based on established medical formulas.
Overweight Calculator
Use your BMI to check if your current weight is in a healthy range.
Pregnancy Calculator
Estimate your due date and get a detailed timeline of your pregnancy journey.
Pregnancy Conception Calculator
A specialized tool to estimate the specific date of conception.
Conception Calculator
Find your likely conception date based on your due date or last menstrual period.
TDEE Calculator
Estimate your Total Daily Energy Expenditure to manage your weight effectively.
GFR Calculator
Estimate Glomerular Filtration Rate to assess kidney function (for clinical use).
Body Surface Area Calculator
Calculate the total surface area of a human body, used for medical purposes.
Your Path to Instant Health Insights
Making smart health decisions is easier when you have the right tools. Our calculators are designed to be simple, fast, and informative. Here’s how to get the most out of our collection.
1. Find Your Calculator
Use the search bar above to type in a keyword (e.g., "macros," "due date") or browse the categorized cards below to find the exact tool you need.
2. Enter Your Information
Click on your chosen calculator and input your specific details (like age, weight, or dates) into the clearly-labeled fields. All calculations are performed in your browser for complete privacy—we never store your data.
3. Get Actionable Results
Instantly receive your calculated result, along with a clear explanation of what it means. Use this information to adjust your diet, fine-tune your workout plan, or share it with your healthcare provider.
Frequently Asked Questions
Are these calculators a substitute for medical advice?
No. Our calculators are intended for informational and educational purposes only. They are not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or another qualified health provider with any questions you may have regarding a medical condition.
How accurate are these online health calculators?
Our calculators are built using well-established, publicly available formulas and standards (such as the Mifflin-St Jeor equation for TDEE or Naegele's rule for pregnancy). While they provide excellent estimates for the general population, individual results can vary. For medical applications like GFR or Body Surface Area, the results should be interpreted by a healthcare professional.
Is the health data I enter kept private?
Yes, your privacy is our top priority. All calculations happen directly in your browser. We do not see, track, or store any of the personal health data you enter into the calculators.
What is the difference between BMI and body fat percentage?
Body Mass Index (BMI) is a simple measure of weight relative to height ($BMI = \frac{weight}{height^2}$). It's a useful screening tool but doesn't distinguish between fat and muscle. Body Fat Percentage is a more precise measurement of your body composition, showing the actual proportion of your weight that is fat. Our tools can help you estimate both.
How do I use the TDEE and Macro calculators together?
First, use the TDEE Calculator to find your daily maintenance calories. Then, input that calorie number into the Macro Calculator to determine the optimal breakdown of protein, carbohydrates, and fats based on your specific goal (e.g., weight loss, muscle gain, or maintenance).