How Many Calories Should I Eat to Lose Weight

"How many calories should I eat to lose weight?" is one of the most common nutrition questions — and one of the most poorly answered online. Extreme meal plans promising rapid results often ignore basic physiology: your body still needs fuel for organs, movement, and recovery. Eating too little can backfire through hunger, muscle loss, and rebound weight gain.

This article walks through a sensible way to set a calorie target: start from your estimated maintenance (TDEE), apply a moderate deficit, and adjust based on real progress over weeks — not days. You will also learn why minimum calorie floors exist, what rate of weight loss is typically reasonable, and what to do when the scale stops moving.

Step 1: Know your maintenance calories (TDEE)

You cannot pick a random "1,200 calorie diet" and expect it to fit your body. Maintenance — the calories needed to keep weight stable — depends on size, age, sex, and activity. The Mifflin-St Jeor equation, used in most reputable calculators, estimates resting needs and then multiplies by an activity factor.

Run the numbers with our TDEE Calculator. Treat the result as a starting estimate, not a laboratory measurement. If your weight trend is flat at that intake for two to three weeks, you are near maintenance. If you gain slowly, intake may exceed maintenance; if you lose slowly without trying, you may already be below it.

Step 2: Choose a deficit size that matches your goal

Fat loss requires consuming less energy than you expend. The size of that gap influences how fast scale weight changes — and how hard the diet feels.

What weekly loss is often considered reasonable?

For many adults, losing about 0.25–0.75 kg (0.5–1.5 lb) per week is a range often cited in clinical and sports nutrition contexts as sustainable for non-medical weight loss. Larger individuals may lose faster at the same percentage deficit; smaller or leaner individuals may see slower changes.

Faster loss is not always better. Very aggressive deficits can increase the proportion of weight lost from lean tissue, especially without adequate protein and strength training.

Translating deficit to daily calories

One kilogram of body fat stores roughly 7,700 kcal of energy. A daily deficit of about 500 kcal might theoretically average near 0.5 kg per week — but real loss is rarely that linear because water shifts, glycogen, and adherence vary.

Common approaches:

• 15–20% below TDEE for a moderate pace
• 300–500 kcal below TDEE if you prefer fixed numbers
• Avoid cutting more than about 25–30% below TDEE without professional guidance

Why you should not go far below certain minimums

Very low calorie intakes may fail to cover essential micronutrients and can leave you fatigued, cold, irritable, or unable to train effectively. There is no universal legal minimum, but general guidance often suggests most adult women avoid sustained intake far below roughly 1,200 kcal/day and most men below roughly 1,500 kcal/day unless medically supervised — because hitting protein, fiber, and micronutrient needs becomes difficult.

These floors are rules of thumb, not personal prescriptions. A tall, active woman may thrive above 1,600 kcal in a deficit; a sedentary man of smaller stature may need careful planning near 1,500 kcal. The point is: smaller numbers are not automatically better.

Protein and training while dieting

Calorie level sets the scale direction; protein and resistance training influence what you lose. Higher protein intake during a deficit (often in the range of about 1.6–2.2 g per kg body weight for active people) may help preserve muscle mass for many individuals.

Strength training two to four times per week provides a stimulus to keep lean tissue. Walking and cardio support health and calorie burn but do not replace lifting for muscle retention.

Our Macro Calculator splits your calorie target into protein, carbs, and fat based on your goal — a practical next step after TDEE.

When weight loss stalls: plateaus and adjustments

A plateau — no meaningful change for three to four weeks — is common. Before slashing calories further, check these factors:

• Logging accuracy: Weekend meals, cooking oils, and beverages add up.
• NEAT decline: Unconscious movement often drops during dieting.
• Water retention: Stress, sodium, new training, and menstrual cycles mask fat loss on the scale.
• Metabolic adaptation: A lighter body burns fewer calories; your old deficit may have shrunk.

If habits are truly consistent, reducing intake by about 100–200 kcal/day or adding structured activity may restart progress. Diet breaks (periods at maintenance) are sometimes used to manage hunger and adherence — evidence is mixed, but they help some people psychologically.

Putting it together: a worked example

Imagine TDEE estimated at 2,200 kcal. A 20% deficit targets 1,760 kcal/day. After four weeks, average weight drops 0.4 kg/week — on track. After another month, loss slows to near zero while intake is unchanged. New estimated TDEE might be closer to 2,050 kcal; the same 1,760 kcal intake is now a smaller percentage deficit. A modest trim to 1,650 kcal or an extra 2,000 daily steps might be enough to continue gradual loss.

Patience and periodic recalculation beat extreme restriction cycles that end in regain.