Calorie Deficit & Weight Loss Calculator
Calculate your daily calorie deficit, expected weekly fat loss, and how long it will take to reach your weight-loss goal.
How This Calorie Deficit Calculator Helps You
A calorie deficit is the key requirement for weight loss. It simply means you burn more calories than you consume. This calculator uses your TDEE (Total Daily Energy Expenditure) and daily calorie intake to estimate your daily deficit and how quickly you can lose fat safely.
Since 1 kilogram of body fat contains roughly 7700 calories, the calculator uses this science-backed value to estimate your fat-loss speed. By entering your target fat loss, you can instantly see how long your weight-loss journey might take.
All calculations run instantly in your browser—nothing is saved or sent to any server. This makes the tool simple, fast, and ideal for daily use while tracking your fitness progress.
Frequently Asked Questions
What is a calorie deficit?
A calorie deficit means consuming fewer calories than your body burns. This forces your body to use stored fat as energy, leading to weight loss.
How is weight loss calculated?
1 kg of fat contains about 7700 calories. Your weight-loss speed is estimated using your daily calorie deficit divided into this number.
Is the estimate accurate?
It is scientifically based but still an estimate. Real results may vary based on hormones, water retention, metabolism, and activity level.
Is any data stored?
No. All calculations stay on your device. Nothing is uploaded or saved anywhere.