Free health calculators
Free calculators that run in your browser: no account, no app install, no data stored. Use them as a starting point, then adjust with real-world results.
Every calculator uses published equations and shows the assumptions behind the number. An estimate of your calorie needs can be off by a few hundred calories in either direction — two weeks of weight data is a better guide than any formula.
Calculators
Calorie calculator
Estimate daily calorie needs for maintaining, losing or gaining weight.
Protein calculator
A daily protein target based on your body weight and goal.
Macro calculator
Turn a calorie target into protein, carbohydrate and fat grams.
BMI calculator
A rough population-level reference — not a verdict on your health.
Frequently asked questions
- Do I need an account to use the calculators?
- No. They are free, work without signing in, and nothing you type is required to leave your device.
- How accurate are the results?
- They are estimates from standard equations. Treat them as a starting point and adjust based on how your weight actually responds over a few weeks.
Prefer to track it in the app?
Everything on this page is free to read. The Healti app is there if you want your meals, workouts and progress kept in one place.
Explore more
The Healti app
Food logging, calories and macros, workout tracking, progress and an AI coach — in one calm app.
AppRecipes
Simple meals with calories, macros, protein and cooking time clearly shown — from quick breakfasts to balanced dinners.
RecipesNutrition
Clear explainers on calories, protein, macros, calorie deficit, weight management and healthy eating.
NutritionTraining
Beginner guidance, strength training, exercise technique and workout plans for home or gym.
TrainingGuides
Practical guides on nutrition, weight management, training and healthy habits.
Guides
Healti provides general information about nutrition and training. It is not medical advice.