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How to find your real maintenance calories

A calculator gets you close. Two to three weeks of honest tracking gets you the real number.

Written by AdnanUpdated 6 min read

To find your real maintenance calories, start with an estimate from the maintenance calories calculator, eat it consistently for 2–3 weeks, and compare your weekly average weights. A TDEE calculator is a good first guess, but it can't see how much you move outside the gym, how much muscle you carry, or how your body responds to food. Your own data can. This method uses what you eat and what your scale says to work backwards to your true maintenance calories.

Why the estimate can be off

Equations predict resting metabolism within about 10% for most people, and the activity level you pick adds more uncertainty on top. For someone with an estimated TDEE of 2,500 calories, the real figure could reasonably be 2,250 or 2,750. That gap is the difference between losing weight and wondering why you aren't.

The method

  1. Start from an estimate. Use the maintenance calories calculator and eat close to that number. Its activity table helps you pick the right level.
  2. Log everything for 14–21 days. Weigh food where you can, and include cooking oil, drinks, sauces and snacks. Consistency matters more than perfection.
  3. Weigh yourself every morning after the bathroom and before eating or drinking, on the same scale.
  4. Average each week. Daily weight can swing by a kilogram or more from water, salt and carbohydrate. Weekly averages smooth that out.
  5. Do the sum below.

The sum

Real TDEE ≈ average daily calories − (weekly weight change in kg × 7,700 ÷ 7)

Use a negative number for weight lost. For pounds, use 3,500 instead of 7,700.

ExampleYou averaged 2,500 calories a day, and your weekly average weight fell by 0.3 kg. 0.3 × 7,700 ÷ 7 = 330. Because you lost weight, your real TDEE is about 2,500 + 330 = 2,830 calories a day.

The 7,700 figure is a rule of thumb for the energy in a kilogram of body tissue. It is less reliable over months, because your body adapts as your weight changes, but it works well for a two-to-three-week check like this.

Common mistakes

  • Judging from one weigh-in. A salty dinner can add half a kilogram overnight. Always compare averages.
  • Starting right after a diet change. Switching to more carbohydrate or salt shifts water weight in the first week. Skip the first 3–4 days, or run the test for three weeks.
  • Forgetting the extras. A tablespoon of oil is about 120 calories. Untracked extras are the most common reason the sum looks wrong.
  • Changing activity mid-test. Keep your training and daily steps roughly the same throughout.
  • Women's cycles. Water retention can rise before a period. Compare the same phase of the cycle where possible, or extend the test.

What to do with the number

Once you know your real maintenance, set your goal from it: subtract 250–500 calories to lose weight, or add 250 to build muscle. Repeat the check every couple of months, or after every 4–5 kg of change, because your TDEE moves with your weight.

Start with an estimate, then refine it.

Open the TDEE calculator

Frequently asked questions

How long does it take to find my maintenance calories?
Two to three weeks of consistent eating and daily weigh-ins is usually enough. Three weeks is better if you have just changed your diet, because water shifts in the first few days can mislead you.
What if my weight goes up and down every day?
That is normal. Daily weight can move by a kilogram or more from water, salt and food. Use weekly averages, which smooth out the noise.
Do I need to count calories exactly?
You need to be consistent rather than perfect. Logging the same way every day, including oils, drinks and snacks, matters more than precision on any single item.

Sources

  1. Hall KD, Sacks G, Chandramohan D, et al. Quantification of the effect of energy imbalance on bodyweight. Lancet. 2011;378(9793):826–837. PubMed 21872751
  2. Frankenfield D, Roth-Yousey L, Compher C. Comparison of predictive equations for resting metabolic rate in healthy nonobese and obese adults: a systematic review. J Am Diet Assoc. 2005;105(5):775–789. PubMed 15883556
  3. National Institute of Diabetes and Digestive and Kidney Diseases. Body Weight Planner. niddk.nih.gov