How many calories do I need to cut to lose 2 pounds a week?

You need a 1,000-calorie daily deficit — 7,000 kcal per week — based on the 3,500 kcal per pound of fat rule. In practice, metabolic adaptation means real-world fat loss often runs 10–20% below that theoretical ceiling after the first month.

Is losing 2 pounds a week safe for most people?

For people with a meaningful amount of weight to lose (body fat well above 25% for men or 32% for women), a 2 lb/week pace is generally considered aggressive but safe when protein is high and calories do not drop below 1,200 kcal/day for women or 1,500 kcal/day for men. Below those floors, micronutrient deficiencies and lean mass loss become significant risks.

Why am I not losing 2 pounds a week even though I'm in a 1,000-calorie deficit?

The most common causes are underestimating food intake (studies show people underreport by 12–35% on average), metabolic adaptation reducing the effective deficit by 200–400 kcal/day after several weeks, and water retention masking fat loss on the scale. Track consistently for 4 weeks before adjusting your protocol.

How Many Calories to Lose 2 Pounds a Week

To lose 2 pounds of fat per week, you need a sustained 1,000-calorie daily deficit — or 7,000 calories below your maintenance level each week.

That figure comes directly from the foundational energy-balance equation: one pound of adipose tissue contains roughly 3,500 kilocalories, so two pounds requires a 7,000 kcal weekly shortfall. The arithmetic is clean. The execution is harder, and the real-world results run slightly lower than the math predicts — but the target deficit is well-established and actionable.

The Math Behind the 1,000-Calorie Deficit

The 3,500 kcal/lb figure originates from Wishnofsky’s 1958 analysis of adipose tissue energy content, and it remains the standard reference cited in Dietary Guidelines for Americans and NIH weight-management guidance. The formula:

Daily deficit needed = (pounds per week × 3,500) ÷ 7 (2 lb/week × 3,500) ÷ 7 = 1,000 kcal/day

Your TDEE (total daily energy expenditure) is the starting point. If your TDEE is 2,400 kcal/day, your target intake is 1,400 kcal/day to create that 1,000-calorie gap.

Use the calorie deficit calculator to find your personal number without manual math.

Realistic Fat Loss at a 1,000-Calorie Deficit

Metabolic adaptation — the body’s tendency to reduce resting metabolic rate, lower non-exercise movement, and suppress thyroid signaling under sustained restriction — means the effective deficit shrinks over time even if your food intake stays constant. The table below shows realistic weekly fat loss across a 12-week period, compared with the theoretical ceiling:

Week range	Theoretical loss (3,500 rule)	Realistic fat loss	Notes
Weeks 1–2	2.0 lb / 0.9 kg	1.8–2.0 lb	Water weight inflates scale drop
Weeks 3–4	2.0 lb / 0.9 kg	1.5–1.8 lb	Glycogen stabilises; true fat loss visible
Weeks 5–8	2.0 lb / 0.9 kg	1.2–1.5 lb	Metabolic adaptation compounds
Weeks 9–12	2.0 lb / 0.9 kg	1.0–1.3 lb	Adaptation plateaus; body weight now lower

Total realistic fat loss over 12 weeks: approximately 17–21 lb (7.7–9.5 kg), versus the theoretical 24 lb. That gap is normal physiology, not failure.

See how factors interact in your own case with the weight loss calculator.

Protein: the Non-Negotiable Variable

At a 1,000-calorie deficit, lean mass loss is a real risk. The International Society of Sports Nutrition (ISSN) recommends 1.6–2.4 g of protein per kilogram of body weight during energy restriction to preserve muscle. For a 75 kg person, that means 120–180 g of protein per day — well above what most people hit at 1,400 kcal/day without deliberate planning. High protein also raises the thermic effect of food, partially offsetting metabolic adaptation.

Who Should Not Target 2 Pounds Per Week

A 1,000-calorie daily deficit is aggressive. It is appropriate only when your TDEE is high enough that eating 1,000 kcal below maintenance still stays at or above 1,200 kcal/day (women) or 1,500 kcal/day (men). Below those floors, micronutrient deficiencies and lean mass catabolism become significant risks. If your TDEE is 1,800 kcal/day, a 1,000-calorie cut leaves you at 800 kcal — unsustainable. A 500-kcal deficit targeting 1 lb/week is safer in that case. For more on pacing, see the full guide on counting calories to lose weight.

How to Apply It

Calculate your TDEE — use activity-adjusted estimates, not generic 2,000-calorie defaults.
Set your calorie target — TDEE minus 1,000, confirmed to be at or above safe minimums.
Set your protein target — 1.6 g/kg body weight as a floor; 2.0 g/kg if you are training.
Track honestly — measure oils, sauces, and condiments; these are the most underreported items per USDA tracking studies.
Review every 4 weeks — if the scale is not trending down over a 4-week window, re-audit accuracy before cutting further.
Protect lean mass — resistance training 2–3 times per week reduces the fraction of weight loss that comes from muscle.

Photograph your meals to log them in seconds with CalEye — accuracy without the friction of manual entry.

Frequently asked questions

How many calories do I need to cut to lose 2 pounds a week?: You need a 1,000-calorie daily deficit — 7,000 kcal per week — based on the 3,500 kcal per pound of fat rule. In practice, metabolic adaptation means real-world fat loss often runs 10–20% below that theoretical ceiling after the first month.
Is losing 2 pounds a week safe for most people?: For people with a meaningful amount of weight to lose (body fat well above 25% for men or 32% for women), a 2 lb/week pace is generally considered aggressive but safe when protein is high and calories do not drop below 1,200 kcal/day for women or 1,500 kcal/day for men. Below those floors, micronutrient deficiencies and lean mass loss become significant risks.
Why am I not losing 2 pounds a week even though I'm in a 1,000-calorie deficit?: The most common causes are underestimating food intake (studies show people underreport by 12–35% on average), metabolic adaptation reducing the effective deficit by 200–400 kcal/day after several weeks, and water retention masking fat loss on the scale. Track consistently for 4 weeks before adjusting your protocol.