Health & Fitness Calculators & Tools
BMI, BMR, Calorie, Body Fat, Pregnancy, and Medical calculators.
These calculators turn body measurements and activity into useful numbers like BMI, calorie needs, and body fat estimates. They are educational tools to help you understand the formulas, not a substitute for advice from a doctor or dietitian.
A1C Calculator - Free Online
Free Convert between A1C percentage and estimated average glucose. Step-by-step solutions and formulas included. Simple, fast, and free.
Blood Alcohol Content (BAC) Calculator
Estimate blood alcohol concentration using the Widmark formula.
Backpack Weight Calculator
Check whether your pack weight is safe as a percentage of body weight.
Blood Alcohol Calculator
Estimate BAC using the Widmark formula.
Blood Pressure Calculator
Analyze blood pressure readings and categorize them.
BMI & BMR Calculator
Calculate both BMI and Basal Metabolic Rate.
BMI Calculator: Check Your Healthy Weight
Check your Body Mass Index (BMI) instantly. Find your healthy weight range based on height, age, and gender.
BMR Calculator
Calculate Basal Metabolic Rate.
Body Fat Percentage Calculator
Estimate body fat percentage using the U.S. Navy method.
Body Surface Area (BSA) Calculator
Calculate body surface area using the Du Bois formula.
Daily Calorie Calculator
Calculate daily calorie needs based on BMR and activity.
Calorie Needs Calculator
Calculate daily calorie needs based on activity level.
Calories Burned Calculator
Estimate calories burned during various activities.
Cholesterol Ratio Calculator
Calculate total cholesterol to HDL ratio.
Conception Date Calculator
Estimate conception date from due date or LMP.
Pregnancy & Due Date Calculator
Estimate your pregnancy due date and milestones using your last period (LMP), conception date, or target due date.
Pregnancy Weight Gain Calculator
Calculate recommended weight gain during pregnancy.
Daily Protein Intake Calculator
Estimate your daily protein needs based on body weight and activity goal.
Salad Calorie Calculator
Add up the calories in a salad from its ingredients.
Sleep Cycle Calculator
Calculate optimal wake-up times based on sleep cycles.
Waist-to-Hip Ratio Calculator
Calculate waist-to-hip ratio for health risk assessment.
Water Intake Calculator
Calculate recommended daily water intake.
How to choose the right Health & Fitness tool
- Checking weight relative to height? Start with the BMI tool.
- Planning calories? Use the BMR and daily-calorie calculators together.
- Tracking fitness over time? The body fat and ideal weight tools give useful reference points.
- Treat every result as a general guide and talk to a professional for medical decisions.
Who these tools are for
For people managing fitness goals, students learning the formulas, and anyone curious about the numbers behind health metrics.
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Explore Other Categories
Popular tools from our other scientific categories
Absolute Value Calculator
Calculate the absolute value of any number. Use this free calculator for fast, accurate answers, complete with the formula and a worked example.
AC to DC Converter Calculator
Convert AC voltage to DC voltage for different rectifier configurations. Free online calculator with instant, step-by-step results.
Acid-Base Titration Calculator
Calculate concentration from titration data. Get quick, accurate results with this free online calculator, including formulas and worked examples.
ABV Calculator
Calculate alcohol by volume from original and final gravity. Free calculator with instant calculations, the underlying formula, and an easy-to-follow example.
Amortization Schedule Calculator - Free Online
Free Generate a complete amortization schedule. Step-by-step solutions and formulas included. Free, accurate results with step-by-step explanations.
Average Cost Basis Calculator - Free Online
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1031 Exchange Calculator - Free Online
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Batting Average Calculator
Calculate batting average in baseball/cricket. Free calculator with instant calculations, the underlying formula, and an easy-to-follow example.
Air Density Calculator
Calculate air density from temperature and pressure using the ideal gas law. Fast, accurate, and free, with formula and example.
Age Calculator
Calculate exact age in years, months, and days. Use this free calculator for fast, accurate answers, complete with the formula and a worked example.
Acceleration Converter
Convert between acceleration units. Get quick, accurate results with this free online converter, including formulas and worked examples.
Circle Area Calculator
Calculate the area and circumference of a circle. Free online calculator with instant results, step-by-step explanations, and a clear worked example.
Angle Between Two Lines Calculator
Calculate the angle between two lines given their slopes. Free calculator with instant calculations, the underlying formula, and an easy-to-follow example.
Apache Log Parser, Free Online Developer Tool
Parse Apache/NGINX combined access log lines into IP, time, request, status and size fields. Get instant results, the formula, and a clear example.
Add Text to Beginning, Free Online Text Tool
Add custom text to the beginning of every line in your text instantly. Get instant results, the formula, and a clear example.
Accessible Color Pair Finder
Check if a text/background pair meets WCAG and suggest a fix. Free tool with instant calculations, the underlying formula, and an easy-to-follow example.