Free calorie and nutrition calculators
Work out your daily calories, BMI, protein and water needs in a minute. Every result shows its formula, a worked example and its limits. No sign-up.
Pick a calculator
Daily Calorie Calculator
Find how many calories to eat each day for your weight goal.
BMI Calculator
Check your body mass index and your healthy weight range.
BMR Calculator
See how many calories your body burns at rest.
TDEE Calculator
Estimate the calories you burn in a whole day.
Protein Calculator
Get a daily protein range that fits your goal.
Water Intake Calculator
Estimate how much fluid to drink each day.
Calories Burned Calculator
Estimate calories burned walking, running, cycling and more.
No calculator matches your search. Try “calories”, “protein” or “water”.
Not sure where to start?
I want to lose or gain weight
Start with a calorie target, then set protein so the weight you change is fat, not muscle.
I want to know what my body burns
Resting burn is the base, daily burn adds movement, and workouts show what one session adds.
I want to check my daily habits
Two quick targets that are easy to track: how much to drink and how much protein to eat.
How CaloriesTools works
Private and free
Every calculation happens in your browser. The numbers you enter are never sent anywhere, and there is nothing to sign up for.
You can see the working
Each result has a “Show the working” panel with your own numbers in the formula, and each page explains the equation and gives a worked example.
Honest about limits
Every calculator is an estimate. Pages say where the number can be wrong and link to the research behind it. Read how we choose the formulas.
These calculators give general estimates, not medical advice. If you have a health condition, are pregnant, or are under 18, talk to a doctor or dietitian first. Read the full disclaimer.