Step 1: Get a starting estimate
Use the calculator above. Choose the activity level that fits a typical week. Round the result to the nearest 50; precision beyond that is not meaningful.
Step 2: Eat around it consistently
For two to four weeks, eat close to that number on most days. A rough log in an app or notebook is enough. Keep your activity about the same as usual so you are testing your real routine.
Step 3: Weigh in and average
Weigh yourself three or more mornings a week, after using the bathroom and before eating, and write it down. At the end of each week, average the readings. Compare week-to-week averages, not individual days.
Step 4: Read the trend and adjust
| After 2–4 weeks your average… | What it suggests |
|---|---|
| Stayed within about 1 lb | Your intake is close to maintenance. |
| Rose steadily | Maintenance is a bit lower; try 100–200 fewer calories. |
| Fell steadily | Maintenance is a bit higher; try 100–200 more calories. |
Repeat for another couple of weeks after any change. The first week after changing intake can show extra water movement, so give it time before adjusting again.
Things that can blur the picture
- Water shifts from salt, carbohydrates, travel, hormonal cycles or a new exercise routine.
- Weekends that look very different from weekdays; include them in your log.
- Changing activity in the middle of the test, such as a vacation or an injury.
Your result is personal and may differ from the formula by a few hundred calories. That doesn’t mean anything is wrong; it means you now have better information than any equation.
Frequently asked questions
How long does it take to find maintenance calories?
Plan on two to four weeks of fairly consistent eating and regular weigh-ins. Daily weight jumps around with water and food, so a single week can mislead; two or more weeks of averages give a clearer picture.
Do I have to count calories exactly?
No. Rough, consistent logging is enough, because you are comparing your typical intake with your weight trend. Being consistent matters more than being precise.
Why did my weight jump after a salty meal?
Salt, carbohydrates, hormones and digestion all change how much water your body holds, which can move the scale a few pounds overnight. That is water, not a change in body fat, and it is why weekly averages are more useful than daily readings.
What if tracking food or weight makes me anxious?
That is worth listening to. You don’t need to track to eat well, and a registered dietitian can help with an approach that suits you. If eating or body image feels hard to manage, support is available from the National Alliance for Eating Disorders.