Calorie Deficit & Weight Loss Timeline Calculator

Use this calorie deficit & weight loss timeline calculator for an approximate adult fitness calculation. Choose US units for pounds, inches or yards, or switch to metric. Results are estimates, not medical or training prescriptions.

Your Numbers

Current Weightkg

Goal Weightkg

Maintenance Calories (TDEE)kcal

Daily Calorie Deficitkcal

Results

Time to Goal—

Daily Calorie Target—

Total to Lose—

Weekly Loss Rate—

Input check—

Results update live as you type. Estimates only — not financial, tax, or investment advice.

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The Formula

Weeks to Goal = (kg to lose × 7,700 kcal) ÷ (daily deficit × 7)

Understanding the Calorie Deficit & Weight Loss Timeline Calculator

Worked example: Going from 90 kg (198.4 lb) to 80 kg (176.4 lb) at a constant 500 kcal daily deficit gives a simplified 22-week estimate. At 2,700 maintenance calories, subtraction gives 2,200 kcal/day.

This static 7,700 kcal/kg model is not a weight-loss forecast or diet prescription. Metabolic needs and water weight change over time. Use the NIH planner for a more detailed adult model.

Reference

NIDDK: dynamic adult Body Weight Planner

This reference explains mortgage cost terminology. This reference provides context and limitations; it does not validate every formula on this page.

Frequently Asked Questions

How is the result calculated?

Weeks to Goal = (kg to lose × 7,700 kcal) ÷ (daily deficit × 7)

What should I know about this estimate?

This static 7,700 kcal/kg model is not a weight-loss forecast or diet prescription. Metabolic needs and water weight change over time. Use the NIH planner for a more detailed adult model.