A quick estimate when you eat out
No label, no recipe, no scales. A photo gets you a reasonable entry in seconds, so a dinner out does not become a blank in your log.

Why restaurant meals are hard
At home you know what went in the pan. In a restaurant you do not, and kitchens are generous with butter, oil and sugar because they make food taste good. Portions also vary from place to place and from day to day. No app can see any of that in a photo, and Luca does not pretend to.
A simple routine
- Take one photo when the plate arrives, with the whole plate inside the square frame. It takes a couple of seconds.
- Look at the item list later, not at the table.
- Adjust for the kitchen. If the dish was fried, creamy or glossy with sauce, add oil or butter as an item. If you left a third on the plate, reduce the portion.
- If the menu printed a calorie figure, use it. Edit the calories to match.
No photo? Say it or type it afterwards: “margherita pizza, about three quarters, and a side salad”.
Good enough is the goal
One loosely estimated dinner does not spoil a week of data. A missing dinner does, a little, because blank days are where logging habits end. The point of a quick photo is to keep the record going with an honest “roughly this”.
Sharing plates and drinks
- Shared dishes: photograph the table if you like, then edit the portions down to what you ate.
- Drinks: type them. A photo of a glass says little about what is in it.
- Bread, oil, nibbles: add them as items if you had them. They are easy to forget.
More on this in calorie estimates when eating out.

Photo, voice and text results are estimates and they are approximate. Adjust them when you know better. Luca is not a medical device and does not give dietary advice.
Questions
Can Luca estimate the calories in a restaurant meal?
It can give an estimate from a photo or a description. Restaurant food is among the hardest to estimate because the fats, sauces and portions are not visible or known, so treat the result as a rough figure and adjust it.
What should I do if the menu shows calories?
Use the menu figure. A number published by the restaurant for that dish is better information than an estimate from a photo. Edit the calories in Luca to match it.
Do I have to photograph my food in front of people?
No. You can say or type what you had afterwards, and Luca returns the same kind of editable estimate.
Snap it. Luca counts.
A free plan, no account, and an estimate you can always correct.