Your maintenance calories are an estimate of the energy your body uses, not a universal number. To set a sustainable deficit, start with a personalized estimate, choose a pace you can maintain, and adjust as your weight and needs change.
How many calories do you need to maintain your weight?
Calorie needs vary with age, weight, height, metabolism, sex, and physical activity. As the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) puts it, “How many calories you need each day depends on your age, weight, metabolism, sex, and physical activity level.” A general calorie target cannot account for all those differences.
Use the NIDDK Body Weight Planner to create a personalized calorie and activity plan for reaching a goal weight and maintaining it afterward. Enter accurate personal details and a realistic account of your activity. The result is a planning estimate, not a precise measurement of your metabolism or a guarantee of a particular outcome.
The planner is intended for adults age 18 or older; it is not intended for younger people or for people who are pregnant or breastfeeding. If you have a health condition, a history of disordered eating, or other circumstances that affect nutrition, ask a qualified health professional for individualized guidance.
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How big should your calorie deficit be?
A calorie deficit means consuming less energy than your body uses over time. It is a planning concept, not a promise that a particular intake will produce a specific rate of weight loss. Rather than subtracting the same fixed number of calories from everyone’s estimated maintenance needs, use a personalized plan and consider whether its goal and timeline feel realistic for you.
The Centers for Disease Control and Prevention (CDC) says that people who lose weight gradually and steadily—about 1 to 2 pounds a week—are more likely to keep it off than people who lose weight faster. This is general guidance, not a required pace or a prediction for any individual. Your progress may be slower, and the right plan is one that supports adequate nutrition and can fit your life.
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- Digital kitchen scale with food-safe, BPA-free plastic components
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- Tare button for measuring just the food, minus the container weight
- Battery operated; (2) AAA batteries included
How to set a calorie goal you can stick to
- Estimate your needs. Use the NIDDK Body Weight Planner and enter your age, height, weight, sex, and realistic activity information.
- Choose a practical goal and timeline. The planner lets you make a goal-weight plan that includes physical activity. Choose an approach you can sustain rather than forcing a rapid timeline.
- Build a workable eating pattern. Use food labels to understand calories per serving and pay attention to portion sizes. A food log or app may help you notice patterns; a digital kitchen scale is optional if measuring portions would be useful.
- Include more than calorie arithmetic. CDC guidance emphasizes that sustainable weight management also involves regular physical activity, sleep, and stress management. Make room for routines and foods you can maintain, rather than treating a target as an all-or-nothing rule.
- Review the plan over time. Track progress in a way that is useful and not burdensome. If the plan is difficult to follow or progress changes, review your activity, eating pattern, and goal with a health professional as appropriate.
Why calorie needs and progress change
As you lose weight, your body needs fewer calories at a lower weight, and metabolism slows during weight loss. That means an intake estimate or deficit that seemed appropriate at the start may need revision later. A slower rate of loss or a plateau can happen; it does not automatically mean you have failed or need a drastic cut.
Static rules that promise a precise amount of weight loss from a fixed calorie reduction do not account for these changes. The NIDDK planner is designed to support planning for both reaching a goal and maintaining it, rather than treating weight change as a fixed arithmetic forecast.
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Choosing tools without making tracking the goal
The Body Weight Planner is useful when you want a personalized calorie and activity plan that also addresses maintenance. Food trackers and smartphone apps can help record food, activity, or weight, but logging is a tool—not a requirement or a measure of success. Consider whether the effort helps you make practical adjustments, and whether the tool is accessible and comfortable for you to use. No particular commercial app is established here as best.
Tracking portions can clarify how much you are eating, especially when serving sizes are unfamiliar. Food labels provide calories per serving; a kitchen scale can help quantify portions if you choose, but it is not necessary for everyone.
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