How to Calculate Your Daily Calories for Weight Loss — 2026 Guide

Losing weight ultimately comes down to one equation: calories in versus calories out. Eat consistently fewer calories than your body burns, and you will lose fat. But that equation has two variables — and most people only focus on one. Understanding how many calories your body actually burns each day (your Total Daily Energy Expenditure, or TDEE) is the foundation of any successful weight loss plan. Set your calorie target too aggressively and you lose muscle, feel terrible, and regain the weight. Set it correctly and the process is manageable and sustainable. This guide explains exactly how to calculate your personal calorie target for weight loss in 2026.

Step 1 — Calculate Your BMR (Basal Metabolic Rate)

Your BMR is the number of calories your body burns at complete rest just to keep you alive — breathing, circulating blood, maintaining organ function. The most accurate formula for most adults is the Mifflin-St Jeor equation: For men: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age in years) + 5. For women: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age in years) − 161. Example: a 30-year-old woman, 65kg, 165cm tall: BMR = (10 × 65) + (6.25 × 165) − (5 × 30) − 161 = 650 + 1,031.25 − 150 − 161 = 1,370 kcal/day. This is her calorie burn at absolute rest — doing nothing at all.

Step 2 — Multiply by Your Activity Level (TDEE)

Your TDEE is your BMR multiplied by an activity factor that reflects your real daily movement and exercise. The standard activity multipliers are: Sedentary (desk job, little or no exercise): BMR × 1.2; Lightly active (light exercise 1–3 days per week): BMR × 1.375; Moderately active (exercise 3–5 days per week): BMR × 1.55; Very active (hard exercise 6–7 days per week): BMR × 1.725; Extra active (very hard exercise plus physical job): BMR × 1.9. Most people who exercise 3–4 times per week and have an office job are Lightly Active to Moderately Active. Be honest — most people overestimate their activity level, which causes them to set too high a calorie target and wonder why they are not losing weight. Continuing the example: 1,370 × 1.375 (lightly active) = 1,884 kcal/day TDEE. This is her maintenance calorie level.

Step 3 — Set Your Calorie Deficit

A calorie deficit means eating less than your TDEE. The size of your deficit determines your rate of weight loss — but larger is not always better. One kilogram of body fat contains approximately 7,700 kcal. To lose 0.5 kg per week, you need a 550 kcal/day deficit (0.5 × 7,700 ÷ 7). Recommended deficit sizes: Mild deficit of 250–300 kcal/day — 0.25 kg/week, easy to sustain, minimal hunger, ideal for those close to their goal weight. Moderate deficit of 500–600 kcal/day — 0.5 kg/week, the most commonly recommended rate, balances progress with sustainability. Aggressive deficit of 750–1,000 kcal/day — up to 1 kg/week, harder to sustain, increases muscle loss risk, and requires higher protein intake. Do not go below 1,200 kcal/day for women or 1,500 kcal/day for men — eating too little slows metabolism, causes muscle loss, and leads to nutrient deficiencies. Continuing the example: 1,884 − 500 = 1,384 kcal/day target for steady 0.5 kg/week loss.

Why Your Calorie Target Might Stop Working

• •Metabolic adaptation: after 4–8 weeks of dieting, your metabolism adjusts downward — your body burns fewer calories at rest. This is normal and expected. It means you need to recalculate your TDEE every 4–6 weeks as your weight decreases.
• •Activity creep: people in a calorie deficit unconsciously move less (fewer steps, less fidgeting). This reduces your actual calorie burn without you realizing. Wearing a step counter helps track this.
• •Inaccurate logging: research consistently shows people underestimate food intake by 20–40%. Cooking oils, condiments, and drink calories are the most commonly missed items. One tablespoon of olive oil = 120 kcal.
• •Calorie label inaccuracy: food labels in many countries are permitted to be up to 20% inaccurate. For precise tracking, weigh ingredients rather than measuring by volume.
• •Overestimated exercise calories: calorie burns shown on gym machines and fitness apps are notoriously inaccurate — often overstated by 30–50%. Never "eat back" all your exercise calories unless you have verified the burn estimate.

Protein: The Most Important Macro for Weight Loss

When eating in a calorie deficit, your body can break down both fat and muscle for energy. Consuming adequate protein signals your body to preserve muscle while burning fat. Research consistently shows that protein intakes of 1.6–2.2g per kg of body weight per day minimise muscle loss during a diet. High protein also significantly reduces hunger — protein is the most satiating macronutrient. For the example above (65kg woman): target 104–143g of protein per day (1.6–2.2 × 65). At 1,384 kcal/day, hitting 120g protein uses 480 kcal, leaving 904 kcal for carbohydrates and fats. Distribute remaining calories roughly 50% carbs and 50% fat, adjusted to your preference.

How Often Should You Recalculate?

Recalculate your TDEE and calorie target every 4–6 weeks, or every time you lose 3–5 kg. As your body weight drops, your BMR decreases — a 70 kg person burns fewer calories at rest than an 80 kg person, so the same calorie deficit will no longer produce the same weekly loss. Regular recalculation prevents the plateau that frustrates most dieters. If you have been eating at your target for 3 weeks with no measurable progress, either your activity estimate is too high or your calorie tracking is off — before reducing calories further, check your logging accuracy and step count first.