Fitness & NutritionCalculators
Free, accurate calculators for BMR, TDEE, macros, BMI, body fat, and calorie planning. Get the numbers you need to achieve your fitness goals.
BMR Calculator
Calculate your Basal Metabolic Rate to know how many calories your body burns at rest. Essential for any diet or fitness plan.
TDEE Calculator
Find your Total Daily Energy Expenditure including activity. Know exactly how many calories you burn each day.
Macro Calculator
Get your optimal protein, carbs, and fat split based on your goals. Perfect for weight loss or muscle building.
BMI Calculator
Calculate your Body Mass Index to assess if you're at a healthy weight for your height. Quick health screening tool.
Calorie Deficit Planner
Plan your calorie intake for weight loss or muscle gain. See exactly when you'll reach your goal weight.
Body Fat Calculator
Estimate your body fat percentage using the U.S. Navy method. Better than BMI for understanding body composition.
Steps to Calories
Convert your daily step count into calories burned. See how walking contributes to your calorie deficit.
Water Intake Calculator
Calculate your optimal daily water intake based on weight, activity, and climate. Stay properly hydrated.
Protein Intake Calculator
Get your optimal daily protein based on weight and fitness goals. Essential for muscle building and recovery.
Intermittent Fasting
Generate your personalized fasting and eating windows. Choose from 16:8, 18:6, or 20:4 methods with tracker.
Why Use Our Calculators?
Our calculators use scientifically-validated formulas to give you accurate results for your fitness journey.
Accurate Formulas
Based on peer-reviewed scientific research and validated equations
100% Private
All calculations happen in your browser. We never store your data
Completely Free
No sign-up required. No hidden fees. Free forever
Mobile Friendly
Works perfectly on any device - phone, tablet, or desktop
How to Use These Calculators
Start with BMR or TDEE
Calculate your baseline calorie needs. This is the foundation for any nutrition plan.
Set Your Goal with Calorie Planner
Use the calorie deficit/surplus calculator to determine your daily target based on your goals.
Calculate Your Macros
Get your optimal protein, carbs, and fat split to maximize results from your diet.
Track Your Progress
Monitor BMI and body fat over time. Use Snapie AI to automatically track your nutrition.