Reviewed by Arisa Tanaphon, Certified Tai Chi Instructor, Mindful Movement Specialist
Key takeaways
- Sustainable weight loss usually means a moderate calorie deficit over time.
- Crash dieting often increases adherence problems and weight regain risk.
- Protein intake, strength training, sleep, and stress management matter alongside calories.
- Use calculators as estimates, then personalize based on response and clinician guidance.
How this calculator works
This tool estimates maintenance calories from age, sex, body size, and activity level. It then suggests mild and moderate daily deficit targets.
The timeline estimate is based on gradual weekly change and is intended as planning guidance, not a guaranteed outcome.
Healthy Weight Loss Calculator
Estimate a realistic calorie target and timeline for gradual, sustainable weight loss.
Estimated calorie targets
0 kcal/day
Moderate deficit (~0.5 kg/week)
Mild deficit target
0 kcal/day
Estimated maintenance
0 kcal/day
Weight to lose: 0 kg
Estimated timeline (mild pace): 0 weeks
Estimated timeline (moderate pace): 0 weeks
Current BMI: 0
Target BMI: 0
This calculator gives estimates only. It is not medical advice.
For healthy and sustainable weight loss, many adults do best with gradual reduction, protein adequacy, strength work, sleep, and clinical guidance when needed.
Healthy calorie deficit ranges
- Mild deficit: often around 300 kcal/day below estimated maintenance.
- Moderate deficit: often around 500 kcal/day below estimated maintenance.
- Very large deficits can increase fatigue, hunger, and lean mass loss risk.
How to think about timeline
Healthy weight loss is typically gradual, often measured over weeks and months rather than days.
A realistic plan is easier to sustain and more likely to preserve long-term habits than aggressive short-term cuts.
Weight loss quality matters
- Prioritize adequate protein and resistance exercise to support lean mass.
- Track progress trends, not day-to-day fluctuations.
- Adjust calorie targets based on real-world response, energy, and adherence.
- If you have a medical condition, get personalized medical nutrition guidance.
FAQ
References
Updated: 2026-04-15
