2026-04-17 · calories, nutrition, calorie deficit, beginner

How Many Calories Should I Eat to Lose Weight

The number you see on a calorie calculator is a starting point, not a prescription. Your ideal intake depends on your height, weight, age, sex, activity level, and how much weight you want to lose. This guide gives you practical calorie ranges, walks you through how to estimate your personal target, and explains why going too low usually backfires.

Key takeaways

• Most adults lose weight eating somewhere between 1,400 and 2,000 calories per day, depending on body size and activity level.
• A deficit of about 500 calories per day targets roughly 1 pound of weight loss per week.
• Your number depends on height, weight, age, sex, and how much you move.
• Going too low (below 1,200 for women or 1,500 for men without medical supervision) raises the risk of muscle loss, nutrient gaps, and rebound overeating.
• Calorie tracking is a short-term learning tool, not a permanent lifestyle requirement.

Who this is for

This article is for beginners and intermediates who want a clear, actionable answer to “how many calories should I eat?” You may be starting a diet for the first time, downloading a calorie-tracking app, or just trying to understand what the numbers mean. If you have a history of eating disorders or are managing a medical condition, work with a clinician or registered dietitian to set your targets.

The short answer

Most adults will lose weight eating 1,400 to 2,000 calories per day, depending on body size and activity. But the right number is personal. Someone who is 5’2” and sedentary needs a very different intake than someone who is 6’1” and exercises five days a week. The rest of this guide shows you how to find yours.

How to estimate your calorie target

Finding your number takes three steps.

Step 1: Estimate your TDEE. TDEE (total daily energy expenditure) is the total number of calories your body burns in a typical day, including movement, digestion, and basic organ function. The simplest way to estimate it is the Mifflin-St Jeor equation multiplied by an activity factor. Our step-by-step TDEE walkthrough walks through the full calculation, but the short version is:

• Calculate your BMR (basal metabolic rate) using the Mifflin-St Jeor formula.
• Multiply by an activity factor (1.2 for sedentary, 1.375 for lightly active, 1.55 for moderately active).

Step 2: Subtract 300 to 500 calories. A daily deficit of 300 to 500 calories is enough to produce steady weight loss (roughly 0.5 to 1 pound per week) without extreme hunger. Larger deficits can work short term under medical supervision, but most people find them hard to maintain.

Step 3: Adjust after 2 to 3 weeks based on results. Track your weight using a 7-day rolling average. If you are losing 0.5 to 1 percent of body weight per week, your target is working. If progress stalls, trim another 100 to 200 calories or add activity. If you are losing faster than that and feeling run down, eat a bit more.

Example calculations

170 lb moderately active woman, age 35, 5’5”:

• Weight: 77 kg. Height: 165 cm.
• BMR (Mifflin-St Jeor): 10 x 77 + 6.25 x 165 - 5 x 35 - 161 = roughly 1,440 kcal.
• TDEE: 1,440 x 1.55 = roughly 2,230 kcal.
• Target with 500 cal deficit: roughly 1,730 kcal per day.

200 lb sedentary man, age 40, 5’10”:

• Weight: 91 kg. Height: 178 cm.
• BMR (Mifflin-St Jeor): 10 x 91 + 6.25 x 178 - 5 x 40 + 5 = roughly 1,828 kcal.
• TDEE: 1,828 x 1.2 = roughly 2,194 kcal.
• Target with 500 cal deficit: roughly 1,694 kcal per day.

These are estimates. Your actual needs may be 10 to 20 percent higher or lower. The goal is a reasonable starting point that you refine with real data. Once you have a target, our sample 7-day meal plan shows what landing near 1,500 to 1,600 calories with adequate protein actually looks like across a week.

Common calorie ranges and what to expect

These ranges give you a rough idea of where different people tend to land. They are starting points, not prescriptions.

1,200 calories per day. This is an aggressive deficit. It is difficult to meet protein and micronutrient needs at this level. Clinical guidelines generally describe 1,200 kcal as the floor for women dieting without medical supervision. Not recommended as a default starting point.

1,400 to 1,600 calories per day. A moderate deficit for smaller or less active adults. Many women in the 5’0” to 5’5” range with sedentary to lightly active lifestyles land here. Adequate for meeting nutrient needs if food choices are deliberate.

1,600 to 1,800 calories per day. A moderate deficit for average-sized adults. Common target for moderately active women and smaller or sedentary men. Enough room for balanced meals and reasonable protein intake.

1,800 to 2,200 calories per day. A mild deficit for larger or more active adults. Typical for men and for women with high activity levels. Easier to sustain long term, though weight loss may be slower (0.5 to 0.75 lb per week).

The right range for you depends on your TDEE. A 2,200 calorie intake could be a deficit for one person and maintenance for another. Always anchor your target to your estimated TDEE rather than picking a number because it sounds right.

Why eating too few calories backfires

Cutting calories aggressively feels productive at first, but it creates problems that undermine long-term results.

Metabolic adaptation. When you eat well below your needs for an extended period, your body reduces non-exercise movement, lowers thyroid output, and burns fewer calories at rest. Research on contestants from The Biggest Loser found that aggressive dieting produced metabolic slowing that persisted years later. A moderate deficit minimizes this effect. If you have been in a steady deficit and weight loss stalls, our plateau guide covers the most common causes and practical fixes.

Muscle loss. In a large deficit, your body breaks down muscle tissue for energy, especially if protein intake is low. Losing muscle lowers your metabolic rate and makes it harder to keep weight off. Prioritizing protein intake and resistance training helps preserve lean mass.

Hunger and binge cycles. Very low calorie diets ramp up hunger hormones (ghrelin) and reduce satiety hormones (leptin). The result is intense cravings that often lead to overeating, followed by guilt and another round of restriction. This restrict-binge pattern is one of the most common reasons diets fail.

Nutrient deficiencies. Below 1,200 to 1,400 calories, it becomes very difficult to get adequate iron, calcium, B vitamins, and fiber from food alone. Deficiencies affect energy, mood, immune function, and bone health.

The better approach is a moderate deficit (300 to 500 calories below TDEE) paired with adequate protein and some physical activity. It is slower, but the results last. If you are tempted by a more aggressive approach, read our guide on how to lose weight fast to understand which shortcuts are safe and which are not.

How to track calories without obsessing

Calorie tracking is a tool for building awareness, not a permanent obligation. Here is a practical approach:

Use an app for 2 to 4 weeks. Apps like MyFitnessPal or Cronometer help you learn what your typical meals actually contain. Most people are surprised by portion sizes, cooking oils, and liquid calories. For a broader look at tracking tools, see our guide to weight loss apps and trackers.

Weigh portions initially. A kitchen scale for the first week or two calibrates your eye. You do not need to weigh everything forever, just long enough to recognize what 4 oz of chicken or a tablespoon of olive oil actually looks like.

Transition to simpler methods. After you have a feel for portions, shift to a plate-based approach (half vegetables, a palm-sized portion of protein, a fist-sized portion of starch) or just track protein and let the rest fall into place.

Watch for signs of obsession. If tracking is causing anxiety, guilt around food, or avoidance of social meals, step back. The point is information, not control. People with a history of disordered eating should discuss tracking with a professional before starting.

Frequently asked questions

Is 1,200 calories enough? For most adults, 1,200 calories is the minimum recommended intake without medical supervision, and even then it is hard to meet protein and micronutrient needs. Unless a clinician has specifically set that number for you, starting with a moderate deficit from your TDEE (typically landing between 1,400 and 1,800 for most women) is usually more sustainable and better for muscle preservation. For a deeper look at structured low-calorie approaches, see our calorie-restricted diets guide.

Should I eat back exercise calories? For most people, no. Fitness trackers and gym machines commonly overestimate calorie burn by 20 to 50 percent. A simpler approach is to choose an activity multiplier that already reflects your normal exercise routine, then keep your daily calorie target fixed. If you add a new, intense exercise habit (like training for a half marathon), revisit your TDEE estimate.

Do macros matter, or just total calories? Total calories determine whether you lose weight. Macros (protein, carbs, fat) determine how you feel and what kind of weight you lose. Protein is the most important macro in a deficit because it preserves muscle and increases satiety. Aim for roughly 0.7 to 1.0 grams of protein per pound of body weight. Beyond that, the split between carbs and fat is mostly personal preference.

How fast should I lose weight? A rate of 0.5 to 1 percent of body weight per week is considered safe and sustainable for most adults. That translates to roughly 1 to 2 pounds per week for someone who weighs 200 pounds, or 0.5 to 1 pound per week for someone who weighs 150 pounds. Faster loss is possible early on (especially if you have a lot to lose), but consistently losing more than 1 percent per week increases the risk of muscle loss and metabolic slowdown. For a detailed look at expected timelines, see our guide on how long it takes to lose weight.

When should I adjust my calorie target? Reassess every 2 to 4 weeks. If your 7-day average weight has been flat for 3 or more weeks despite consistent tracking, reduce intake by 100 to 200 calories or add activity. Also recalculate your TDEE after every 10 to 15 pounds of loss, since a smaller body burns fewer calories. If your recalculated TDEE leaves very little room for a deficit, see our guide on what to do if your TDEE comes in low for strategies that focus on increasing activity rather than cutting food further. If you are not sure whether you have truly stalled, our plateau troubleshooting guide walks through the steps.

Practical next steps

This week:

• Estimate your TDEE using the Mifflin-St Jeor equation (or use our TDEE guide for a step-by-step walkthrough).
• Subtract 300 to 500 calories to set a starting target. Make sure the result stays above 1,200 (women) or 1,500 (men) unless directed otherwise by a clinician.
• Download a calorie-tracking app and log everything for 7 days, including cooking oils, drinks, and sauces.

Over the next month:

• Track your 7-day average weight each week. Look for a downward trend of 0.5 to 1 percent of body weight per week.
• Aim for a protein target at each meal. See our protein intake guide for specific gram ranges.
• Adjust your calorie target if the trend is flat for 3 or more weeks, or if you are losing faster than expected and feeling depleted.

What to watch for:

• Manageable hunger (not extreme or constant).
• Stable energy throughout the day.
• Gradual, consistent weight loss on the weekly average.
• If none of these are true after 3 to 4 weeks of consistent tracking, revisit your TDEE estimate and your portion accuracy before cutting further.