How to Find Your Maintenance Calories: Estimate, Then Test

This article is for educational purposes only and is not medical advice. Talk with a qualified healthcare professional before making major nutrition, weight loss, or medication-related changes.

To find your maintenance calories, start with a calculator estimate, then test it: log everything you eat for four weeks, weigh yourself most mornings, and compare your average daily intake with the change in your weekly average weight. If the weekly average holds steady, your intake is about maintenance. If it moves, adjust by about 3,500 calories per pound, divided by the days between the weeks you compare.

This guide is for adults who track their food and want a maintenance number based on their own data, whether they plan to maintain, lose, or gain. It explains how close a calculator gets, walks through the four-week test with a worked example, and lists what can skew the result. It does not set a weight-loss target, and it does not replace advice from a clinician.

What Are Maintenance Calories?

Maintenance calories are the calories you eat each day, on average, while your weight stays about the same. They match your total daily energy expenditure, or TDEE: the calories you burn at rest, through daily movement and exercise, and by digesting food. When your average intake matches your TDEE over several weeks, your weight holds steady.

Maintenance is not a fixed trait. It changes with your weight, your activity, and your routine, so a number from last year may not fit today. Our guide to calculating your TDEE covers the formulas in detail. This guide shows how to check a formula estimate against what your weight actually does.

How Close Is a Maintenance Calorie Calculator?

A calculator gives a reasonable starting estimate, but it can be off by a few hundred calories a day for one person. Most calculators, including our TDEE calculator, estimate your resting calories with the Mifflin-St Jeor equation and then multiply by an activity factor that you choose.

Mifflin-St Jeor was built from resting measurements of 498 healthy adults aged 19 to 78. In a 2005 systematic review of resting-rate equations, it came within 10% of the measured value in more nonobese and obese adults than the other equations reviewed. The authors still found noteworthy errors for individuals, and older adults and U.S. ethnic minorities were underrepresented in the studies.

The National Institutes of Health Body Weight Planner is another formula-based tool, and it shows the calories needed to reach and then keep a goal weight. Its page notes that people often underestimate how much they eat, and that its values will be too high for someone with an unusually low metabolism or who is very sedentary. Neither formula can see your routine. Your log and your scale can.

How to Find Your Maintenance Calories From Your Own Data

The test takes four weeks of normal eating, a complete food log, and regular weigh-ins. You do not need to eat at maintenance to measure it: the weight trend shows how far your intake was from maintenance.

1. Pick four steady weeks. Choose a stretch without travel, illness, a holiday, or a big change in training, and eat your usual way. Holidays skew the result: in a smart-scale study of adults in a European weight-loss maintenance trial, weight rose an average of 1.35% over Christmas and was not fully reversed in the following months.
2. Log everything, every day, including weekends. Include cooking oil, drinks, sauces, and bites taken while cooking. Our guide to logging cooking oil covers one item that is easy to miss. Weekends matter: a study of weekend lifestyle patterns and body weight followed 48 adults aged 50 to 60 through a one-year trial. At the start, participants gained weight on weekend days, which the authors tied to higher intake on Saturdays and less activity on Sundays.
3. Weigh yourself most mornings under the same conditions. Use the same scale, after using the bathroom and before eating or drinking. Single readings jump around, which is why the next step uses averages.
4. Average each full week. A 7-day average includes every day of the week once. In the smart-scale study above, weight rose over the weekend and fell during the week, a within-week swing of about 0.35%, or about 0.6 lb for a 180-lb adult. A full-week average evens out that pattern.
5. Compare week 1 with week 4 and calculate. Use the formula in the next section. If the weekly averages zigzag with no clear direction, add two more weeks before you calculate.

The Formula for Maintenance Calories From Your Log

Maintenance calories equal your average daily intake plus the calorie value of your weight change spread over the days it took. In pounds and calories:

Count the days between the middles of the two weeks, not the length of the whole test. Week 1 and week 4 are 21 days apart, not 28. Dividing by 28 would understate the daily gap by a quarter.

Her result falls between the lightly and moderately active calculator estimates (2,101 and 2,369) and replaces that 268-calorie range with one number from her own data. She was also eating about 150 calories below maintenance during the test, which shows why you do not need to eat at maintenance to find it.

Where the 3,500 figure comes from, and its limits

3,500 calories per pound (32.2 megajoules per kilogram) is the conventional energy value of a pound of weight change. Kevin Hall's 2008 analysis, What is the required energy deficit per unit weight loss?, found that it roughly matches the energy in weight lost by people who start with more than 30 kg (about 66 lb) of body fat, but overstates it for people with less body fat.

For a leaner person, the formula's correction will run a little high. In the example, even a 20% lower value would change the correction from 150 to 120 calories, moving the answer by 30.

The rule is far less reliable as a forecast. In their 2013 commentary, Can a weight loss of one pound a week be achieved with a 3500-kcal deficit?, Thomas and colleagues compared the rule's predictions with seven supervised weight-loss experiments and found that it overestimated how much weight people actually lost, because energy needs fall as weight falls over months. This test uses the rule backward over a few weeks, when that drift is small: by the rule of thumb in the section on weight loss below, losing 0.9 lb lowers maintenance by about 9 calories a day.

Why a longer test gives a steadier answer

Weekly averages still carry some water and food noise. The table shows how much a trend error of 1 pound or half a pound changes the daily answer, depending on how many days separate the weeks you compare.

Comparing two weeks that sit 7 days apart turns a half-pound water swing into a 250-calorie error. Comparing weeks 21 days apart cuts the same swing to about 83 calories, and 42 days apart cuts it to about 42. Two weeks of data is a rough check; four to six weeks is steadier.

How to Read Your Weight Trend

Your weekly averages tell you which way to adjust, and sometimes that the test needs more time.

The first-week drop has a known source. Glycogen, the carbohydrate stored in muscle and liver, is held with three to four parts water, according to a 1992 paper on glycogen storage and weight fluctuations. When you change how much carbohydrate you eat, the scale can move more than body fat does for several days. Our guide to day-to-day weight fluctuation covers other reasons the number moves.

What Can Throw Off Your Maintenance Number?

The calculation is simple, so the result depends on the quality of its two inputs: your log and your weekly averages.

• Food that never gets logged. Self-reported intake tends to come in low. In the OPEN study of 484 adults aged 40 to 69, 24-hour recall interviews underestimated energy intake by 12 to 14% in men and 16 to 20% in women, compared with energy use measured by doubly labeled water. A recall interview is not an app log, so those percentages do not transfer directly to your tracking.
• Your result is maintenance as you log it. If you consistently leave out about 150 calories of oil and snacks a day, your measured maintenance will be about 150 calories lower than your true maintenance. It still works as a target inside the same log, as long as your logging habits stay the same. Our guide to how accurate food labels are explains another reason logged numbers differ from what you ate.
• Missing days are not zero days. Log a rough estimate for a day you missed, or leave that day out of the average and treat the answer as less certain. Entering your target for an unlogged day makes the average match your plan instead of what you ate.
• A change in routine during the test. A new training plan, a new job, or a big change in daily steps changes your maintenance too. Restart the four weeks from the new routine.
• Exercise calories added to your budget. The test uses only what you ate and what the scale did, so your activity is already counted in the result. Do not add tracker calories on top. Our guide to active versus total calories explains how watch numbers fit with a daily target.

Does Maintenance Change When You Lose Weight?

Yes. A smaller body burns fewer calories, so maintenance falls as weight comes off. For an average adult with overweight, Hall and colleagues' 2011 Lancet paper, Quantification of the effect of energy imbalance on bodyweight, gives a rule of thumb of about 10 calories a day for each pound of weight change. In the same model, about half of the eventual weight change after a lasting change in intake takes about a year, and 95% takes about three years.

Recheck your maintenance after a sizable weight change, a lasting change in activity, or when your weight trend stops matching what your log predicts. If your weight has stopped moving during a deficit, our weight-loss plateau guide covers what to check before you cut further.

Who Should Be Careful With This?

Daily weigh-ins and four weeks of detailed logging are not right for everyone. Skip this method, or use it with a professional's help, if you have a history of disordered eating, if weighing yourself or logging food leaves you anxious or preoccupied, or if you are under 18.

Talk with a clinician or registered dietitian before changing your intake based on this number if you are expecting a baby or breastfeeding, are managing a health condition that affects your weight or fluid balance, or already follow an intake plan a clinician set for you. If your measured maintenance seems unusually low even with a complete log, ask a doctor about it instead of eating less to match it.

Where Kalo Fits

Kalo is a calorie and macro tracking app for iOS and Android. This test needs a complete daily food log and your weigh-ins in one place. Kalo's App Store listing describes logging a meal by typing or speaking a description, reviewing the foods, portions, calories, and macros before saving, and adding meals you eat often again from Recent, Favorites, and My Food. The listing also describes daily calorie and macro breakdowns, nutrition trends, and weight progress over time, which are the inputs to the calculation above.

The listing also describes personalized goals for losing weight, maintaining your weight, or building muscle. Once you have measured your maintenance, compare it with the target the app sets for you. Kalo's numbers are estimates you can edit. Kalo is free to download, and using it requires a subscription; current terms are shown on the store purchase screen.

Frequently Asked Questions

Sources

Sources checked November 4, 2026. The woman in the worked examples is fictional, and her weights and intake are illustrations, not predictions. The tables are arithmetic at 3,500 calories per pound. The 10-calories-per-pound rule of thumb is an average from one model of adults with overweight. Kalo publishes this guide and makes a calorie tracking app. No clinical review is claimed.

• Mifflin MD, et al. A new predictive equation for resting energy expenditure in healthy individuals. Am J Clin Nutr (1990)
• Frankenfield D, et al. Comparison of predictive equations for resting metabolic rate in healthy nonobese and obese adults: a systematic review. J Am Diet Assoc (2005)
• National Institutes of Health: Body Weight Planner (checked November 4, 2026)
• Hall KD. What is the required energy deficit per unit weight loss? Int J Obes (2008)
• Thomas DM, et al. Can a weight loss of one pound a week be achieved with a 3500-kcal deficit? Commentary on a commonly accepted rule. Int J Obes (2013)
• Hall KD, et al. Quantification of the effect of energy imbalance on bodyweight. Lancet (2011)
• Subar AF, et al. Using intake biomarkers to evaluate the extent of dietary misreporting in a large sample of adults: the OPEN study. Am J Epidemiol (2003)
• Racette SB, et al. Influence of weekend lifestyle patterns on body weight. Obesity (2008)
• Turicchi J, et al. Weekly, seasonal and holiday body weight fluctuation patterns among individuals engaged in a European multi-centre behavioural weight loss maintenance intervention. PLoS One (2020)
• Kreitzman SN, et al. Glycogen storage: illusions of easy weight loss, excessive weight regain, and distortions in estimates of body composition. Am J Clin Nutr (1992)
• Kalo Macro - Calorie Counter - App Store listing (version 7.0, checked November 4, 2026)