Calorie Deficit Calculator
See your daily calorie deficit and the estimated weekly weight loss it produces in pounds and kilograms.
- Estimated weekly loss
- 1 lb (0.45 kg)
- Estimated monthly loss
- 1.98 kg
Formula: Deficit = TDEE − intake; weekly loss ≈ deficit × 7 ÷ 3500 lb
About Calorie Deficit Calculator
Calorie Deficit Calculator is a free online calculator that gives you an instant, accurate result as you type. See your daily calorie deficit and the estimated weekly weight loss it produces in pounds and kilograms.
The calculation uses the standard formula Deficit = TDEE − intake; weekly loss ≈ deficit × 7 ÷ 3500 lb and updates live with every change to the inputs. Everything runs client-side in your browser — fast, private, and free to use as often as you like.
A pound of body fat stores roughly 3,500 kcal, so a 500 kcal daily deficit corresponds to about one pound (0.45 kg) of loss per week.
Results are estimates for educational purposes and not medical advice.
Frequently Asked Questions
Is Calorie Deficit Calculator free to use?
Yes. Calorie Deficit Calculator is completely free, with no sign-up, no downloads, and no usage limits. You can use it as many times as you like on any device with a web browser.
How accurate is this calculator?
The calculator applies the standard formula (Deficit = TDEE − intake; weekly loss ≈ deficit × 7 ÷ 3500 lb) with full floating-point precision and rounds only the displayed result. For most practical purposes the results are exact.
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