Looking for an Eric Trexler calorie calculator?
If you follow Eric Trexler's nutrition research and writing, a daily calorie target starts with maintenance calories, also called total daily energy expenditure (TDEE). Eat around that amount to maintain weight, below it for weight loss, or above it for weight gain. Your maintenance needs can change, so treat the first number as an estimate to refine rather than a fixed metabolic measurement.
Eric Trexler is a co-creator of MacroFactor and the author of its article on reverse dieting and dynamic maintenance. If you are looking for the associated app, MacroFactor Nutrition offers food logging, expenditure estimates, and coached calorie targets. This is an independent guide, not an official Eric Trexler calculator; MacroCodex is not affiliated with or endorsed by Eric Trexler or MacroFactor and does not reproduce their methods.
Our claim: See measurable weight gain or weight loss results within 2–3 weeks of using MacroCodex. Many users start seeing results as early as the first week.
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Calculate a daily calorie target for free
- Open MacroCodex and enter your details to get an initial maintenance-calorie estimate.
- Choose maintenance, weight loss, or weight gain. The app sets a daily calorie target from your maintenance estimate and goal.
- Record your calorie intake and body weight consistently. MacroCodex updates its maintenance estimate and targets as it learns from your trend.
Maintenance is a moving estimate, not a number you discover once. Changes in body weight, activity, and food intake can affect your expenditure. When moving from a deficit to maintenance, extra food and glycogen can also increase scale weight without representing the same amount of fat gain. Give the trend time to settle before treating an initial jump as proof that your target is wrong.
MacroCodex is free and has no ads or subscription. It asks you to enter daily calorie totals; if you want a food diary, you can use a separate logger such as CalorieCodex. Consistent records across weeks are more useful than changing your target after each weigh-in.
Want the details behind the estimate? See how adaptive TDEE works. For MacroFactor's subscription and a free-app comparison, see MacroFactor pricing and our MacroFactor alternative guide.