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Free online weight loss calculator. Calculate how long to reach your goal weight based on calorie deficit and exercise. Science-based 7700 kcal = 1kg formula.
← Back to HomeThe Weight Loss Calculator is a free online tool that runs entirely in your browser — no software installation required. Your data stays on your device and is never uploaded to any server, ensuring complete privacy. Compatible with all major browsers and mobile devices, it's available anytime, anywhere. Use this weight loss calculator to scientifically plan your weight loss journey with realistic calorie targets. Based on the proven 7700 kcal = 1 kg (3500 kcal = 1 lb) principle. Simple, intuitive operation with instant results. The weight loss calculator provides accurate timeline predictions and calorie planning for everyday health management. All processing is done locally in your browser for speed and security. Whether on desktop or mobile, you get a smooth experience.