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Calorie Deficit Calculator

Daily calorie deficit needed to lose a target weight by a date, and how long your chosen deficit will take.

Enter values

Results update as you type.

Result

Daily deficit needed

733 kcal

Roughly 7,700 kcal equals 1 kg of body fat (3,500 kcal per lb).

Daily calorie target
1,667 kcal
Weekly loss
0.67 kg
Total deficit
61,600 kcal

Educational estimate only — not medical advice. Talk to a healthcare professional about your individual situation.

About the Calorie Deficit Calculator

Daily calorie deficit needed to lose a target weight by a date, and how long your chosen deficit will take.

Also known as: deficit calculator, calories to lose weight, weight loss deficit, cutting calories.

How to use this calculator

  1. Enter maintenance calories (tdee), units, weeks to reach it and the other fields.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

Deficit = kg to lose × 7,700 ÷ days

Worked example

Using the values pre-filled in the calculator above:

  • Maintenance calories (TDEE) = 2,400 kcal
  • Units: Metric (kg, cm)
  • Weight to lose = 8 kg
  • Weeks to reach it = 12

the calculator returns:

  • Daily deficit needed: 733 kcal
  • Daily calorie target: 1,667 kcal
  • Weekly loss: 0.67 kg
  • Total deficit: 61,600 kcal