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.
All calculators
Calorie Calculator
Estimate how many calories your body uses on a normal day, and what that means if you want to keep, lose or gain weight.
Calorie CalculatorProtein Calculator
See a sensible daily protein range for your body weight and what you are training for — in grams per day and grams per kilo.
Protein CalculatorMacro Calculator
Split your daily calories into protein, carbs and fat — in grams and percentages, with a split that suits how you train and eat.
Macro CalculatorBMI Calculator
Work out your BMI from height and weight, and see what the number is actually useful for — and what it leaves out.
BMI Calculator
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.
TrainingExercises
Every exercise with an animation, the muscles it works, step-by-step form and the mistakes to avoid.
ExercisesTraining programs
Ready-made programs for building muscle, losing weight, strength and health — at the gym, with dumbbells or at home.
ProgramsGuides
Practical guides on nutrition, weight management, training and healthy habits.
Guides
Healti provides general information about nutrition and training. It is not medical advice.