Nutrition & Fitness Calculators
Free, private, and instant. No signup required — just enter your details and get personalized results.
Calorie Calculator
How many calories do you need per day? Calculate TDEE, BMR, and weight-loss targets.
Open calculator →Calorie Deficit Calculator
See how long it takes to reach your goal weight with a daily calorie deficit.
Open calculator →Macro Calculator
Split your daily calories into protein, carbs, and fat. Choose a preset or custom ratio.
Open calculator →BMI Calculator
Check your body mass index, category, and healthy weight range in seconds.
Open calculator →Ideal Weight Calculator
Find your healthy weight range using the Devine and Hamwi formulas.
Open calculator →Water Intake Calculator
Calculate how much water you should drink based on weight, activity, and climate.
Open calculator →Protein Calculator
How much protein do you need? Calculate daily targets by goal and activity level.
Open calculator →Body Fat Calculator
Estimate your body fat percentage with the US Navy method — no calipers needed.
Open calculator →Meal Calorie Estimator
Estimate calories and macros in any meal. Perfect for restaurants and home cooking.
Open calculator →All your nutrition data in one place
These calculators give you estimates. For precise daily tracking with photo scanning, barcode lookup, and AI-powered logging, download CalRay.
Common Questions
Are these calculators accurate?
Our calculators use established scientific formulas (Mifflin-St Jeor, US Navy method, Devine/Hamwi, etc.) and give reliable estimates. Individual results vary based on genetics, hormones, and measurement accuracy. For precise daily tracking, use the CalRay app with actual food logging.
Is my data private?
Yes — completely. All calculations run instantly in your browser. We do not store, transmit, or log any of the numbers you enter. No account, no cookies, no tracking.
Can I use these on mobile?
Absolutely. Every calculator is fully responsive and works on iPhone, Android, and any modern mobile browser. The interface adapts automatically for touch input and smaller screens.
How do these compare to the CalRay app?
These calculators give you one-time estimates. The CalRay app goes further with daily photo-based food logging, barcode scanning, AI meal recognition, weight tracking, and personalized insights that adapt to your actual progress over time.