Free calorie tracker.
Log food and activity. See how many calories you have left today.
Free essentials · No account needed
How Calotank works
Meals use your daily calories; logged activity adds more. Follow an example day, step by step.
Set your calorie budget
Choose your own daily budget. This example starts with 2,000 calories.
Log a meal
Log a tuna salad at 600 kcal. After saving the meal, 1,400 kcal remains in your daily budget.
Log activity
Enter 400 kcal for the walk. Saving it adds those calories to your budget: 1,400 + 400 = 1,800 kcal. Manual logging is free.
See what is left
You have 1,800 kcal left. The orange part of the tank shows the extra calories from logged activity.
Review the day’s entries
The same list shows the tuna salad at 600 kcal and the walk at +400 kcal. You can edit either entry.
Save flexibility in Flex
Flex is a calorie bank: calories saved from your budget build up as flexibility and cover small overages on other days. The screen shows 1,200 kcal saved. You can use it for a Joker day — a break from logging.
Free essentials. No account needed.
Start for free.
Enter your meal and activity calories yourself. See your remaining daily budget at a glance.
No account or Premium subscription needed for the essentials.
Flex and Joker days are included for free, too
Flex saves a day’s unused calories when you confirm its entries on the following day. Going over your budget reduces your savings. Flex stays separate from the next day’s base budget.
Use your savings for a Joker day: a day without logging meals or activity. The app shows how many calories it costs, and that amount is deducted from your Flex balance.
Read the Flex and Joker day guidePremium
Want a hand from AI?
Premium AI estimates meal calories from a photo or text and activity calories from your description. It also includes the Calotank Assistant to help you make sense of your day.
An optional paid subscription. Check the price and terms in the app before subscribing.
AI provides an estimate. Review and adjust the calories before saving.
How to estimate meal calories from a photoSee the Premium logging screens
Calotank Assistant Ask the Assistant about today’s entries. Its answers use your logged meals, activity and calorie budget.
Calculators and practical guides
Understand calories. Find your way to log.
Check food calories and nutrients
Find a food or drink and enter your portion size. See calories and nutrition for your portion and per 100 grams.
Open the food calorie calculatorHow many calories a day?
Estimate your daily energy needs with the free maintenance calorie calculator. Read the method and its limitations.
Open the calorie calculatorA food diary for everyday meals
Understand your eating patterns and find changes that fit your routine. Explore the benefits of a food diary and Calotank’s free meal logging.
Start a food diaryCalculate calories in a meal
Go from a nutrition label to your own portion. Learn to use gram weights and account for homemade meal ingredients.
Read the calorie counting guideTest your calorie intuition
Which food has more calories? Compare 100 g of each and challenge a friend.
Play the calorie gameCommon questions
More help and contact detailsHow does Calotank support weight management?
If you are looking for a weight-loss app to track meals and daily calories, Calotank brings your entries together. See how your meals fit into the daily budget you set. Enter calories you know yourself, or use photo and text estimates with paid Premium.
Is Calotank free?
Yes. Manual calorie logging, your daily budget, Flex and Joker days are free. AI estimates and the Assistant are part of an optional paid Premium subscription.
Do I need an account?
You do not need a Calotank account. You can get started right in the app.
Is Calotank available for iPhone or Android?
Calotank is available for iPhone on the App Store and for Android on Google Play. The essentials are free, with no account needed.
Where does my calorie budget come from?
Enter your own daily budget or use the app’s optional starting estimate. It uses the details and goal you provide. It is an approximate starting point that you can change later in settings.
Where is my data stored?
Daily entries are stored on your device. If you use optional AI features, the information you send them is processed as described in the privacy policy.