Calculator Inputs
Formula Used
This tool can use three energy formulas. Mifflin St Jeor uses weight, height, age, and sex. Revised Harris Benedict uses the same body inputs. Katch McArdle uses lean mass. It needs body fat percent.
- Mifflin St Jeor: Male BMR = 10W + 6.25H - 5A + 5. Female BMR = 10W + 6.25H - 5A - 161.
- Revised Harris Benedict: Male BMR = 88.362 + 13.397W + 4.799H - 5.677A. Female BMR = 447.593 + 9.247W + 3.098H - 4.330A.
- Katch McArdle: BMR = 370 + 21.6 × lean body mass in kilograms.
- Daily burn: TDEE = BMR × activity multiplier + extra exercise calories.
- Calorie deficit: Daily deficit = weekly loss in kilograms × 7700 ÷ 7.
How to Use This Calculator
- Select metric or imperial units first.
- Enter current weight, goal weight, age, and height.
- Choose the formula that matches your available data.
- Pick the activity level that best describes your week.
- Choose weekly loss or a target date.
- Set a calorie floor and macro preferences.
- Press calculate and review the result above the form.
Example Data Table
| Current Weight | Goal Weight | Activity | Weekly Target | Planning Note |
|---|---|---|---|---|
| 90 kg | 80 kg | Moderate | 0.5 kg | Balanced pace |
| 210 lb | 190 lb | Light | 1 lb | Simple start |
| 75 kg | 68 kg | Very active | 0.4 kg | Training support |
Healthy Weight Loss Planning
Weight loss works best when the plan is clear. A calculator can show numbers. It cannot replace judgment. Your body still needs energy, sleep, water, and recovery. The best target is usually moderate. Fast plans often feel exciting. They can also feel hard to keep. A steady deficit gives your habits time to improve.
Why Calories Matter
Your body burns calories for basic life functions. It also burns calories through movement. The total is called daily energy use. When food energy is lower than this amount, the body uses stored energy. That creates weight change over time. The calculator estimates this gap. It also checks your timeline against your chosen pace.
Body Metrics Give Context
Current weight tells only part of the story. Height, age, sex, and body fat can change the estimate. Activity level also matters. A desk worker and a builder may need different targets. Two people can weigh the same. Their daily needs can still be different. That is why this tool includes formula choices.
Choosing a Practical Deficit
A deficit should support progress without draining your day. Many users prefer a small daily cut first. They then review weight trends after two weeks. This avoids panic from normal water changes. Large deficits may lower energy. They can also increase hunger. A smaller deficit may feel slower. It is often easier to repeat.
Using Macros Wisely
Macros divide calories into protein, fat, and carbohydrates. Protein helps meals feel filling. It also supports lean tissue during weight loss. Fat supports hormones and flavor. Carbohydrates can support training and busy days. The best split is the one you can follow. The calculator gives a starting point, not a rigid rule.
Tracking Progress
Daily weight can move for many reasons. Salt, stress, sleep, and training can shift water. Use weekly averages instead of one number. Measure waist size too. Note energy and hunger. If progress stalls for several weeks, adjust gently. Change one variable at a time. This keeps decisions simple.
Making Adjustments
Small changes protect consistency. When the scale stalls, review tracking first. Check portions, drinks, sauces, and weekend meals. Then review steps and training. If habits are accurate, reduce calories slightly. You can also increase movement. Avoid changing everything at once. One clear change shows what worked. Keep records simple. Note calorie target, average weight, and hunger. This makes the next adjustment easier. It also reduces emotional choices. Compare weekly averages before judging progress. Stay patient during travel, soreness, or poor sleep. Consistency beats pressure in most plans.
Smart Habits Help
Plan meals before hunger gets high. Keep protein in each meal. Add vegetables for volume. Drink water regularly. Walk more during the day. Strength training can support shape and function. Sleep keeps cravings lower for many people. Use this calculator as a planning guide. Use steady habits, track results, and adjust with care.
Frequently Asked Questions
1. What does this calculator estimate?
It estimates daily calories, energy burn, target deficit, timeline, BMI, and macros. The result is an estimate. Real progress can change because of water, sleep, training, stress, and tracking accuracy.
2. Which formula should I choose?
Mifflin St Jeor is a practical default. Revised Harris Benedict is another common option. Katch McArdle can help when body fat percent is known. Use the same formula consistently when comparing plans.
3. Why does activity level matter?
Activity level estimates calories burned beyond basic body functions. A higher activity setting raises daily energy use. Choose the closest average week. Avoid choosing an intense level for only one hard workout.
4. What is a calorie deficit?
A calorie deficit means eating less energy than your body uses. The calculator converts your weekly loss target into a daily calorie gap. That gap creates the estimated timeline.
5. Why did the calorie floor change my result?
The calorie floor prevents the target from dropping below your selected limit. When the floor raises calories, the actual deficit becomes smaller. Your adjusted date may move later.
6. Can I use pounds and inches?
Yes. Select imperial units. Enter weight in pounds. Enter height using feet and extra inches. The calculator converts those values internally before applying the formulas.
7. What if I know my target date?
Select the target date method. The calculator compares your total weight loss goal with the days available. It then estimates the daily deficit needed for that timeline.
8. Are macro targets required?
No. Macro targets are planning aids. Protein, fat, and carbohydrate estimates help structure meals. You can change protein and fat settings to match personal food preferences.
9. How often should I recalculate?
Recalculate after meaningful weight change, activity change, or schedule change. Many people review every two to four weeks. Use trend averages, not single weigh-ins.
10. Why can results differ from other tools?
Different tools may use different formulas, activity multipliers, calorie floors, and rounding rules. Food tracking and exercise estimates also vary. Treat every result as a starting estimate.
11. Is this calculator medical advice?
No. It is a general planning tool. People with health conditions, pregnancy, eating disorder history, or special nutrition needs should speak with a qualified professional before dieting. Use steady habits, track results, and adjust with care.