Calorie Tracking for Beginners

The three numbers that matter (and the one that does not)

When you set up a calorie tracker, the app will ask for ten things. Most of them are noise. The only numbers you actually need to know on day one are:

• Total daily calories. The sum of everything you eat in a 24-hour window. This is the lever for weight change.
• Protein grams. Set this first. Aim for 1.6–2.2 grams per kilogram of bodyweight if you lift. Examine.com summarizes the evidence — the consensus holds across age, sex, and training status.
• Trend weight, not daily weight. Take a 7-day rolling average. Daily weight bounces 1–2 kg from water, sodium, and gut content; the trend is the signal.

The number you can ignore: macros beyond protein. Carbs and fat matter for performance, but the optimal split is a minor optimization compared to nailing total calories and protein. Do not waste your first month juggling carb cycling.

Step-by-step setup (10 minutes)

1. Compute your TDEE

Use the Mifflin-St Jeor equation: 10 × weight(kg) + 6.25 × height(cm) − 5 × age + (5 if male, −161 if female). Multiply by an activity factor between 1.4 and 1.75 depending on how many times a week you train. CalStory does this in your onboarding profile; if you are not on CalStory yet, the Calculator.net TDEE calculator is a solid backup. The result is your maintenance calories — eat this and your weight is stable.

2. Set the calorie target

To lose weight: subtract 300–500 kcal. Bigger deficits work but cause more muscle loss and adherence problems.

To gain weight: add 200–400 kcal. Bigger surpluses mostly add fat, not muscle.

These numbers come from Hall et al. (2011) on energy balance and from the practical guidance in Stronger By Science’s diet guide.

3. Set protein

1.6 g/kg as a floor, 2.2 g/kg as a ceiling for lifters. There is no proven benefit above 2.2 g/kg. Hit this number and the rest of the macros can fill in however you prefer.

4. Log fast enough to keep doing it

The single biggest predictor of calorie-tracking success is whether you still log in week three. Two habits make the difference:

• Use AI logging. A 2024 usability study found AI food logging cut median log time from 47 seconds to under 9 — a 5x improvement that translates to roughly 2x higher week-4 retention.
• Save frequent meals as templates.If you eat the same breakfast five days a week, log it once, save it, and one-tap re-log it. CalStory calls these “recent meals” and surfaces them at the top of the log screen.

What to do when tracking breaks down

You will eat at a restaurant and not know the calories. You will have a binge day. You will go on vacation. None of these are failures — they are data. Two things help:

1. Look at weekly averages, not daily numbers. A single 4,000 kcal day inside a week of 2,000 kcal averages to 2,286 kcal — close enough to your target.
2. Never log a zero day. If you ate, log something, even if the number is a guess. Logging a placeholder keeps the streak alive and the habit intact.

Tools that help

A good tracker shows three things on one screen: calories remaining, protein remaining, and a recent-meals shortcut. CalStory, MacroFactor, and MyFitnessPal all hit this bar; the right choice is whichever one you will still open on day 21. Try CalStory free — it is built around exactly this flow.

Frequently asked questions