How Many Calories to Lose 5kg? Exact Numbers + Timeline

The maths behind losing 5kg

One kilogram of body fat contains approximately 7,700 calories. To lose 5kg of pure fat, you therefore need to create a total calorie deficit of around 38,500 calories. This is the foundational number everything else flows from.

In practice, early weight loss also includes water and glycogen, so the scale may move faster at the start. Over time, the rate usually settles to reflect true fat loss. The key variable you control is your daily deficit — how many fewer calories you consume (or burn) compared to your maintenance level.

What daily deficit is right for you?

Research consistently supports a deficit of 300–500 kcal per day as the sweet spot for fat loss. Below 300 kcal/day, progress is very slow and motivation suffers. Above 700 kcal/day, the body starts breaking down muscle tissue for energy and hormonal disruption (particularly in women) becomes more likely.

A 500 kcal deficit is the most widely recommended starting point. For a person with a TDEE of 2,000 kcal/day, that means eating 1,500 kcal/day — which is manageable for most people, especially with high-protein, high-fibre foods that promote satiety.

Smaller individuals (TDEE under 1,700 kcal) should target a 200–300 kcal deficit to avoid eating too little. Larger individuals can comfortably sustain a 500–600 kcal deficit without feeling deprived.

Realistic timelines for losing 5kg

Based on the maths above, here is what a realistic timeline looks like at different deficit sizes:

These are estimates. Real-world loss is rarely perfectly linear — weight fluctuates daily due to water, sodium, hormones, and food volume. Judge progress by the trend over 2–3 weeks, not by the daily scale reading.

How to create the deficit: diet vs. exercise

A calorie deficit can come from eating less, moving more, or — ideally — both. Diet is generally more efficient for creating the deficit because it is easier to not eat 300 calories than to burn 300 calories through exercise (a brisk 30-minute walk burns roughly 150–200 kcal for most people).

A practical approach: cut 300–400 kcal from food and add 100–200 kcal of extra movement per day. This distributes the effort, preserves workout performance, and is more sustainable than dramatic food restriction alone.

Resistance training is especially valuable during a deficit — it signals the body to preserve muscle even when calories are low, meaning more of the weight lost comes from fat rather than lean tissue.

Why the scale might not move as fast as expected

Several factors can slow apparent progress even when you are in a genuine deficit. Water retention from stress, poor sleep, or high sodium intake can mask fat loss for days at a time. Starting a new exercise programme adds temporary inflammation and water to muscles. Hormonal fluctuations in women can add 1–3 kg of water weight during different phases of the menstrual cycle.

The most reliable way to assess true progress is to track weekly average weight (sum of 7 daily weigh-ins divided by 7) rather than individual readings. Body measurements — waist, hips, thighs — also reveal fat loss that the scale sometimes hides.

Tips to make the deficit sustainable

• Eat at least 1.6g of protein per kg of body weight to preserve muscle and reduce hunger.
• Prioritise high-volume, low-calorie foods: vegetables, lean proteins, legumes, and fruit.
• Do not skip meals entirely — spreading calories across 3–4 meals reduces hunger spikes.
• Plan one maintenance day per week if needed — it will not derail progress and improves adherence.
• Weigh yourself at the same time each morning (after using the bathroom, before eating) for consistent data.
• Recalculate your calorie target every 5–10 kg lost, since your TDEE decreases as you lose weight.