How to Lose 1 Pound (0.5 kg) Per Week

Q: How do I lose 1 pound a week?

Create a 500 kcal/day calorie deficit: calculate TDEE, subtract 500 kcal to get your daily target, and sustain this for at least 4 weeks. Diet reduction plus moderate exercise is the most sustainable combination.

Q: Is it realistic to lose 1 pound per week?

Yes — 0.5 kg/week is the most widely recommended and realistic rate for most healthy adults. It is fast enough for clear progress while slow enough to preserve muscle mass and maintain hormonal health.

Q: Why am I not losing 1 pound per week despite a 500 calorie deficit?

Causes include water weight fluctuations masking fat loss, TDEE decreasing as body weight drops, calorie tracking inaccuracy, and increased appetite. Assess progress over a 4-week average. If no trend, recalculate TDEE and tighten tracking.

Q: Can I lose 1 pound per week without exercise?

Yes — fat loss is driven by calorie deficit, not exercise. A 500 kcal dietary reduction achieves the same theoretical rate. However, resistance training preserves muscle during the deficit and produces better long-term body composition.

Losing approximately 0.5 kg (1 pound) per week is the most widely recommended rate of fat loss — fast enough to produce clear, motivating progress while slow enough to preserve muscle mass and avoid the hormonal disruption associated with crash dieting. This guide explains the mathematics behind this rate, how to calculate your daily deficit, the practical combination of diet and exercise that makes it sustainable, and the real-world limitations that affect actual outcomes.

By the FitCalcHub Editorial Team — Updated August 2026 — 8 min read

The 3,500 kcal Rule: Where It Comes From

The widely cited rule — "3,500 calories equals one pound of fat" — comes from a 1958 paper by Max Wishnofsky, who estimated that stored human fat tissue contains approximately 3,500 kcal per pound (7,700 kcal/kg). From this, the simple prediction follows: a 500 kcal/day deficit maintained over 7 days produces 3,500 kcal of deficit, corresponding to approximately 1 pound (0.45 kg) of fat loss.

This model has important limitations in the real world:

Early weight loss includes water and glycogen: In the first 1–2 weeks, much of the scale weight lost is water and glycogen — not fat. Weekly loss often appears higher than 0.5 kg early on.
TDEE decreases as body weight drops: The same 500 kcal deficit becomes progressively smaller as you lose weight and TDEE decreases — meaning fat loss rate slows even when adherence is perfect.
Metabolic adaptation: The body reduces NEAT (non-exercise movement) and slightly lowers metabolic rate in response to a sustained deficit — reducing the effective deficit further.

More accurate models (such as the NIH Body Weight Planner, based on Hall's dynamic systems model) account for these adaptations. However, the 500 kcal/day target remains a reliable practical starting point — with the expectation that targets will need adjustment over time.

Based on: Thomas DM, Gonzalez MC, Pereira AZ, et al. "Time to correctly predict the amount of weight loss with dieting." J Acad Nutr Diet. 2014;114(6):857–861. PubMed ↗

How to Create a 500 kcal/Day Deficit

A 500 kcal/day deficit can be achieved through diet alone, exercise alone, or — most sustainably — a combination:

Approach	Diet reduction	Exercise addition	Notes
Diet only	−500 kcal/day	None	Simplest; no muscle preservation signal from exercise
Exercise only	None	+500 kcal burn/day	Requires ~60–90 min exercise; appetite often increases
Combined (recommended)	−300 kcal/day	+200 kcal burn/day	Best body composition outcomes; more sustainable

Step 1: Use the TDEE Calculator to find your total daily energy expenditure. Step 2: Subtract 500 kcal to get your daily calorie intake target. Step 3: Use the Calorie Deficit Calculator to see your projected timeline to goal weight.

Based on: Hall KD, et al. "Quantification of the effect of energy imbalance on bodyweight." The Lancet. 2011;378(9793):826–837. PubMed ↗

Is 1 Pound Per Week Safe for Everyone?

The 0.5 kg/week rate is appropriate for most people, but individual context matters:

People with more fat to lose (>20 kg above goal): A higher rate — up to 1% of body weight per week — is often appropriate and carries a lower muscle-loss risk because the body can draw more readily from fat stores.
People close to goal weight (<5 kg above goal): A slower rate of 0.25 kg/week is often more appropriate to avoid muscle loss, hormonal disruption, and the difficulty of sustaining a deficit when total fat stores are limited.
Athletes and active individuals: A slower, more conservative deficit (250–300 kcal/day) better preserves performance, training recovery, and lean mass during a fat loss phase.

Why Real-World Loss Differs From the Prediction

Even with a consistent 500 kcal/day deficit, actual weekly scale weight change will rarely match 0.5 kg exactly. Normal causes of variation include:

Water retention: High sodium meals, intense exercise, hormonal fluctuations (particularly in women around the menstrual cycle), and changes in carbohydrate intake all cause day-to-day scale fluctuations of 1–3 kg unrelated to actual fat change.
Glycogen loading: Increasing carbohydrate intake after a period of low-carb eating fills glycogen stores (muscle and liver), temporarily adding 0.5–1.5 kg of water weight.
Simultaneous muscle gain: Resistance training while in a slight deficit can produce body recomposition — fat loss offset by muscle gain — where scale weight changes little but body composition improves significantly.

Always assess progress using a 2–4 week rolling average of morning body weight rather than day-to-day readings. A trend of 0.4–0.6 kg downward per week on average confirms the deficit is working, even when individual days show no movement or slight increases.

When the average stops declining over 3+ weeks, recalculate TDEE at your new body weight and reduce calorie intake by 100–200 kcal further. See our guide on Weight Loss for the full framework, including how to handle plateaus.

Frequently Asked Questions

How do I lose 1 pound a week?

To lose approximately 1 pound (0.45 kg) per week, create a 500 kcal/day calorie deficit. Step 1: calculate your TDEE using the TDEE Calculator. Step 2: subtract 500 kcal to get your daily calorie target. Step 3: sustain this consistently for at least 4 weeks before evaluating progress. The 500 kcal deficit can come entirely from reduced food intake, from exercise, or from a combination of both — diet plus moderate exercise is the most sustainable and best for body composition.

Is it realistic to lose 1 pound per week?

Yes — 0.5 kg/week is the most widely recommended and realistic rate of fat loss for most healthy adults. It is fast enough to produce clear, motivating progress over months while slow enough to preserve muscle mass, avoid significant hormonal disruption, and sustain dietary adherence. Faster rates (1 kg+/week) are possible but carry a higher risk of muscle loss and metabolic adaptation. Progress will naturally slow over time as TDEE decreases with weight loss.

How long does it take to lose 10 pounds (4.5 kg)?

At the 1 pound per week rate, losing 10 pounds takes approximately 10 weeks (70 days). In practice, the actual timeline is slightly longer because TDEE decreases as you lose weight, gradually shrinking the effective deficit. At a 0.5 kg/week rate, 4.5 kg takes approximately 9 weeks. These estimates assume consistent adherence and account for normal fluctuation in water weight.

What exercise burns 500 calories a day?

Activities that burn approximately 500 kcal depend heavily on body weight and intensity. For a 75 kg person: running at 8 km/h for 50–55 minutes, cycling at moderate intensity for 70–80 minutes, or strength training for 60–70 minutes (though strength training burns are lower per hour than cardio). However, creating a full 500 kcal/day deficit through exercise alone is challenging and often increases appetite. A combined approach — 300 kcal dietary reduction plus 200 kcal exercise — is more practical for most people.

Why am I not losing 1 pound per week despite a 500 calorie deficit?

Several factors cause real-world loss to differ from the prediction: water weight fluctuations masking fat loss (normal), TDEE decreasing as body weight drops (shrinking effective deficit), calorie tracking inaccuracy (common), increased appetite partly offsetting the deficit, and simultaneous muscle gain from resistance training. Assess progress over a 4-week rolling average rather than weekly. If the average still shows no downward trend, recalculate TDEE at your new weight and tighten food tracking accuracy.

Is 500 calories a day enough of a deficit?

For most adults, yes — a 500 kcal/day deficit is sufficient for meaningful, sustainable fat loss (approximately 0.5 kg/week). It falls within the evidence-based safe range and is manageable in terms of hunger and hormonal health over months. If 500 kcal feels too aggressive (constant severe hunger, fatigue, poor performance), a 250–300 kcal deficit is a better starting point — particularly for athletes or those close to their goal weight.

Can I lose 1 pound per week without exercise?

Yes — fat loss is primarily driven by calorie deficit, not by exercise. A 500 kcal/day dietary reduction achieves the same theoretical fat loss rate as a combined diet-exercise approach. However, exercise — particularly resistance training — provides important additional benefits: it preserves muscle mass during the deficit, maintains a higher metabolic rate, and produces better long-term body composition outcomes. Diet-only fat loss tends to result in more lean mass loss alongside fat loss.

How many calories do I need to cut to lose 0.5 kg per week?

0.5 kg of body fat contains approximately 3,500–3,850 kcal. To lose 0.5 kg per week requires a weekly deficit of approximately 3,500 kcal — which equates to 500 kcal/day. The metric equivalent of the "3,500 calories per pound" rule is approximately 7,700 kcal per kilogram of fat. A 500 kcal/day deficit produces approximately 0.45–0.5 kg of fat loss per week under ideal conditions.

This article is part of our complete Weight Loss Guide.

Medical Disclaimer: Weight loss outcomes vary significantly between individuals. The calorie estimates in this article are based on population-level averages and predictive models. Individual results depend on genetics, body composition, hormonal health, and adherence. Consult a registered dietitian or healthcare provider before starting a weight loss programme, especially if you have a medical condition.

Scientific References

Thomas DM, Gonzalez MC, Pereira AZ, et al. "Time to correctly predict the amount of weight loss with dieting." J Acad Nutr Diet. 2014;114(6):857–861. PubMed ↗
Hall KD, Sacks G, Chandramohan D, et al. "Quantification of the effect of energy imbalance on bodyweight." The Lancet. 2011;378(9793):826–837. PubMed ↗
Wishnofsky M. "Caloric equivalents of gained or lost weight." Am J Clin Nutr. 1958;6(5):542–546. PubMed ↗