Science-backed · Free · No sign-up
Free Nutrition Tools
Eight calculators built on peer-reviewed equations used by dietitians and researchers. Get your numbers in seconds — no account required.
Calorie Deficit Calculator
Calculate your optimal calorie deficit for safe, sustainable weight loss based on your TDEE.
CalculateTDEE Calculator
Find your Total Daily Energy Expenditure using the scientifically-validated Mifflin-St Jeor equation.
CalculateBMI Calculator
Calculate your Body Mass Index and understand what it means for your health.
CalculateMacro Calculator
Get your ideal protein, carbs, and fat targets based on your goals and activity level.
CalculateBMR Calculator
Calculate your Basal Metabolic Rate — the calories your body burns at complete rest.
CalculateProtein Intake Calculator
Find your optimal daily protein intake based on your weight, activity, and fitness goals.
CalculateIdeal Weight Calculator
Estimate your ideal body weight using multiple scientifically-established formulas.
CalculateBody Recomposition Calculator
Calculate your training and rest day calories for simultaneous fat loss and muscle gain.
CalculateTrack it effortlessly with AI
KCALM uses AI-powered food recognition to track your calories and macros automatically. Just snap a photo.
Frequently Asked Questions
Are these nutrition calculators free?
Yes, all eight calculators are completely free with no sign-up required. They use the same scientifically-validated formulas used by registered dietitians and nutrition researchers.
Which calculator should I start with?
Start with the TDEE Calculator to find your daily calorie needs, then use the Calorie Deficit Calculator if your goal is weight loss or the Macro Calculator to dial in your protein, carbs, and fat targets.
How accurate are the results?
Our calculators use peer-reviewed equations like Mifflin-St Jeor (BMR/TDEE) and validated BMI formulas. They provide reliable estimates, but individual metabolism can vary by 5-15%. For personalized guidance, consult a registered dietitian.
Can I use these calculators on my phone?
Absolutely. Every calculator is fully responsive and works on any device. For ongoing tracking, download the free KCALM app which uses AI-powered food recognition to log meals automatically.
What is TDEE and why does it matter?
TDEE (Total Daily Energy Expenditure) is the total number of calories your body burns in a day, including exercise. Knowing your TDEE is the foundation for any nutrition goal — whether you want to lose weight, gain muscle, or maintain your current body composition.