Nutrition

How to count calories for weight loss

By the Gantsn team · Updated October 8, 2026 · 2 min read

Quick answer: Log everything you eat for 2–4 weeks, measure the calorie-dense stuff (oils, nut butters, cheese, sauces), and focus on getting close, not perfect. Consistency beats precision.

Why counting works

Most people underestimate how much they eat, often by a lot. Logging closes that gap. Even if you don’t count forever, a few weeks teaches you what portions really look like.

How to start

  1. Get your target from the calorie deficit calculator.
  2. Log as you go, not at the end of the day.
  3. Measure the calorie-dense foods: oils, butter, nut butters, cheese, dressings, granola. A food scale helps a lot.
  4. Repeat meals. Eating a few go-to breakfasts and lunches makes logging take seconds.
  5. Hit protein first, then fill in the rest.

Gantsn’s food log lets you type meals in plain English, like “2 eggs and toast,” and estimates the calories for you.

Common mistakes

  • Not counting cooking oil and sauces
  • Forgetting drinks: lattes, juice, alcohol
  • Eyeballing peanut butter and cheese
  • Skipping weekends
  • Using restaurant guesses that are far too low

Eating out

Chain restaurants post nutrition info, so use it. For other places, log a similar dish from a chain, and add 20% to be safe. Ask for dressings and sauces on the side.

Questions

Do I have to count calories forever?

No. Many people count for a few months, learn their portions, then switch to tracking just protein or weighing in regularly.

How accurate do I need to be?

Close enough is fine. Aim for consistency. If your weight isn’t moving after 2–3 weeks, tighten up the logging first.

Is counting calories bad for you?

For most people it’s a useful tool. If tracking makes you anxious or triggers disordered eating, stop and talk to a professional.

Keep reading

This article is general information, not medical advice. Talk to your doctor before making changes to your diet, exercise or medications.