Health & Fitness calculator
Weight Loss Calculator
Calculate time to reach your goal weight based on calorie deficit.
About the weight loss calculator
The weight loss calculator estimates how long it takes to reach your goal weight based on calorie deficit.
How to use this calculator
- 1
Enter current and goal weight
Enter your current weight and target weight.
- 2
Enter calorie intake and TDEE
Enter your daily calorie intake and maintenance calories.
- 3
View results
See estimated time to reach your goal.
How the calculation works
1 kg fat ≈ 7,700 cal. Deficit = TDEE − intake. Days = (weight loss × 7,700) ÷ deficit.
Example: 80→70 kg, TDEE 2,500, intake 1,800: ≈ 110 days.
Important health disclaimers
These calculators provide estimates based on population averages. Individual results vary based on genetics, body composition, medical conditions, and medications. Always consult a healthcare provider before starting a new diet or exercise program, especially if you have underlying health conditions.
Understanding body composition metrics
BMI doesn't distinguish muscle from fat. Body fat % is more accurate but depends on measurement technique. TDEE varies day-to-day based on activity. Macro targets are starting points — adjust based on your results, energy levels, and goals. Hydration needs increase with exercise, heat, and altitude.
Important limitations
This tool provides a mathematical estimate based only on the values entered. It does not account for regulations, taxes, lender fees, market conditions, or individual circumstances. Results are for planning purposes only — consult a qualified professional for regulated, medical, financial, or construction decisions.
Frequently asked questions about weight loss calculator
How accurate is the weight loss calculator?+
The calculation follows the displayed formula and retains full numeric precision before formatting the result.
Can I use the result professionally?+
Use it as a planning estimate. Confirm regulated, medical, financial, or construction decisions with a qualified professional.