Example Data Table
| Start Weight |
Target Weight |
Loss Needed |
Weekly Pace |
Estimated Time |
Daily Deficit |
| 83 kg |
68 kg |
15 kg |
0.50 kg |
30 weeks |
550 kcal |
| 83 kg |
68 kg |
15 kg |
0.75 kg |
20 weeks |
825 kcal |
| 83 kg |
68 kg |
15 kg |
1.00 kg |
15 weeks |
1100 kcal |
Formula Used
Weight loss needed: Current weight − Target weight.
Total goal loss: Start weight − Target weight.
Estimated energy gap: Weight loss needed × Calories per kilogram.
Daily deficit: Weekly loss × Calories per kilogram ÷ 7.
Estimated weeks: Weight loss needed ÷ Planned weekly loss.
BMI: Weight in kg ÷ Height in meters squared.
BMR: 10 × weight + 6.25 × height − 5 × age + sex constant.
TDEE: BMR × Activity factor.
Suggested intake: TDEE − Daily deficit.
How to Use This Calculator
Enter your start weight, current weight, and target weight. The default goal is 83 kg to 68 kg.
Add your height, age, sex, and activity level. These values estimate BMI, BMR, and daily energy use.
Choose a planned weekly loss pace. A lower pace gives a longer timeline. A higher pace needs a larger deficit.
Press the calculate button. The result appears above the form and below the header section.
Review the timeline, deficit, BMI values, and suggested intake. Use the export buttons to save CSV or PDF records.
Weight Loss Planning Guide
Why This Goal Needs Structure
Moving from 83 kg to 68 kg is a 15 kg reduction. It is a clear target, but the path needs structure. A calculator helps turn the target into dates, deficits, and weekly milestones. It also shows how small changes affect the finish date. This makes planning easier and less emotional.
Understanding the Numbers
Body weight changes when energy balance changes over time. A deficit means the body uses more energy than it receives. The tool estimates total energy linked with the planned loss. It also estimates weekly and daily deficits from your selected pace. The result is not a medical prescription. It is a planning estimate.
Using BMI and BMR
BMI compares weight with height. It is useful for quick screening, but it does not measure muscle, water, or body fat directly. BMR estimates basic energy use at rest. TDEE adjusts that estimate for activity. Together, these values help you compare a target intake with your expected daily burn.
Choosing a Sensible Pace
A slower pace is often easier to maintain. Fast targets may create hunger, fatigue, or missed nutrients. The calculator lets you test different weekly loss rates. You can see how the timeline changes before changing your routine. This supports better decisions.
Tracking Progress
Progress rarely moves in a perfect line. Water, salt, sleep, and training can shift scale weight. Weekly averages are more helpful than single readings. Use the export buttons to save results after each update. Compare records over time and adjust carefully.
Reviewing Records Over Time
Keep each exported file with the date. Add notes about meals, steps, sleep, and training. These notes explain changes better than weight alone. When progress slows, review averages first. Then adjust pace, activity, or intake with care. Avoid sudden extreme changes daily.
Final Planning Tips
Set a start weight, target weight, height, age, and activity level. Review the deficit, projected finish date, and BMI values. If the suggested intake looks very low, choose a slower pace. Speak with a qualified professional when you have health conditions, medication needs, or a history of disordered eating. Safe plans protect energy, mood, and long term consistency.
FAQs
1. What does this calculator estimate?
It estimates weight loss needed, energy deficit, timeline, BMI, BMR, TDEE, and a suggested daily intake for a goal from 83 kg to 68 kg.
2. Is 83 to 68 kg a 15 kg loss?
Yes. Subtract 68 from 83. The total goal loss is 15 kg. The remaining loss can change if your current weight is different.
3. What calorie value is used per kilogram?
The default value is 7,700 kcal per kilogram. You can edit this field if your planning method uses a different estimate.
4. Why does activity level matter?
Activity level adjusts estimated daily energy burn. A higher activity level increases TDEE. This can change the suggested intake estimate.
5. Can I change the weekly loss pace?
Yes. Enter any positive weekly pace. A slower pace creates a longer timeline and smaller daily deficit. A faster pace does the opposite.
6. Does BMI measure body fat?
No. BMI compares weight and height. It does not directly measure body fat, muscle mass, water, or body shape.
7. Why is my suggested intake low?
A low suggested intake usually means the selected pace needs a large deficit. Try a slower weekly loss goal and review your plan carefully.
8. Is this calculator medical advice?
No. It is an educational planning tool. Speak with a qualified professional before starting a major weight loss plan.