How this tool works
Mifflin-St Jeor estimates BMR, then multiplies by an activity factor. It is a planning estimate, not medical advice.
Calorie Needs Calculator
Estimate daily maintenance calories using the Mifflin-St Jeor equation and an activity multiplier.
What to do with the answer
Estimate daily maintenance calories using the Mifflin-St Jeor equation and an activity multiplier. The useful part is not just the first answer; it is checking whether the answer still makes sense when the uncertain number changes.
Quick check
- Read the result label first so you know whether it is monthly, yearly, daily, a percentage, a date or a total.
- Change the input you are least sure about and compare the second answer with the first.
- Use a related guide or worksheet when the result affects a bill, budget, health target, study plan or purchase.
Turn calorie maintenance into a testable range
Maintenance calories are an estimate of the energy needed to keep body weight roughly stable. The result is useful for planning, but it is not a promise. Real energy use varies with movement, tracking accuracy, body composition, sleep, health conditions and changes in daily routine.
Worked example
If the calculator estimates 2400 calories for maintenance, a modest deficit might be planned below that number and a gaining phase above it. The key is to compare the estimate with actual weight trend over several weeks, not one weigh-in after a salty meal or hard workout.
Things to double-check
The Mifflin-St Jeor equation estimates basal metabolic rate from sex, age, height and weight, then the activity multiplier estimates daily movement. The activity choice is often the weakest input, so run sedentary, light and moderate cases if you are unsure.
Next step
Use Calorie Deficit and Maintenance Guide, then compare protein with the Protein Target Calculator and walking activity with the Walking Calorie Calculator.
A better way to use this page
Run one realistic example, then run one cautious version. For a cost page that might mean a higher price or longer time. For a date page it might mean a different deadline. For a health, study or work page it might mean a more conservative target.
If both answers point to the same next step, the result is easier to trust as a rough planning number. If they are very different, the input you changed is the one to check before you rely on the answer.
Use it with real numbers
Calorie Needs Calculator is most useful when you open it with one actual thing in mind: a quote, bill, grade target, label, deadline, trade entry, measurement or plan you are trying to check. Sample numbers are fine for learning the page, but the result becomes more useful when it is tied to a real choice.
After the first answer, change one important input and calculate again. If the answer hardly moves, you have a steadier estimate. If it jumps, that input deserves attention before you compare options, save the result or share the link.
Use the links around the page to move from the number to the next action. A worksheet is better when you need notes or side-by-side options. A guide is better when the calculation needs context, definitions or common mistakes.