BMR
Basal Metabolic Rate
Daily calorie planning for fat loss
Calorie Deficit Calculator
Estimate BMR, TDEE, maintenance calories, and a daily calorie target for steady fat loss.
Daily calorie target
BMR + TDEE
Metric + imperial
Deficit planning
1
Your Information
Enter personal details to estimate calories and set a starting calorie deficit.
2
Daily Calories
Your metabolic baseline, maintenance calories, and starting daily budget.
TDEE
Total Daily Energy Expenditure
Maintain Calories
Weight maintenance
3
Calorie Deficit and Projection
Adjust the daily deficit to see how the target and weight-loss pace change.
Results
Your personalized calorie target
Calories per Day
1,770 cal
to reach your goal
Estimated Weight Loss
1.0 lbs per week
with a 500 cal daily deficit
Tip: A moderate deficit often feels more sustainable than a very aggressive cut.
Calorie Deficit Quick Facts
These reference points answer the questions that come up most often before the formulas, examples, and FAQs.
How This Calorie Deficit Calculator Works
This calorie deficit calculator for weight loss begins with BMR, converts that into maintenance calories using an activity multiplier, and then subtracts a daily deficit to estimate a starting calorie target. The weekly weight-loss projection is a planning estimate rather than a guarantee.
BMR Formula
Male: 10 x weight(kg) + 6.25 x height(cm) - 5 x age + 5
Female: 10 x weight(kg) + 6.25 x height(cm) - 5 x age - 161
Maintenance Calories
TDEE = BMR x activity factor
The maintenance calories calculator uses the activity factor chosen above to estimate how many calories keep body weight stable.
Daily Calorie Target
Target calories = TDEE - daily deficit
When the result drops below a common calorie floor, the page limits the target and updates the expected pace.
Projected Weekly Change
lb per week = daily deficit x 7 / 3500
kg per week = daily deficit x 7 / 7700
Activity Factors and Daily Deficit Guide
Most people comparing maintenance calories, weight-loss calories, or a 500 calorie deficit want the same three things: activity multipliers, example deficit sizes, and practical guidance on what feels sustainable. This section brings those pieces together in an easy-to-scan format.
Activity Multipliers
| Activity level | Factor | When it fits best |
|---|---|---|
| Sedentary | 1.20 | Mostly sitting, very little structured exercise. |
| Lightly active | 1.375 | Light training or brisk walking 1 to 3 days per week. |
| Moderately active | 1.55 | Regular exercise 3 to 5 days per week. |
| Very active | 1.725 | Hard training 6 to 7 days per week. |
| Extra active | 1.90 | Very demanding training or a highly physical job. |
Common Deficit Sizes
| Daily deficit | Approx. weekly loss | Pace | Notes |
|---|---|---|---|
| 250 cal | 0.5 lb / 0.23 kg | Slow and easy | Useful when hunger, recovery, or schedule are already challenging. |
| 500 cal | 1.0 lb / 0.45 kg | Moderate | A common starting point for steady fat loss in healthy adults. |
| 750 cal | 1.5 lb / 0.68 kg | Fast | More aggressive and harder to maintain for long periods. |
| 1000 cal | 2.0 lb / 0.91 kg | Very aggressive | Usually best saved for short blocks or clinical supervision. |
Worked Examples
Examples make the calculator easier to use in real life. They show what common deficit sizes can look like in daily calorie terms and how pace changes over time.
Example 1: Moderate deficit
Maintenance calories: 2,300
Daily deficit: 500
Daily calorie target: 1,800
Planning estimate: about 1 lb per week
Example 2: Slower pace
Maintenance calories: 1,950
Daily deficit: 250
Daily calorie target: 1,700
Planning estimate: about 0.5 lb per week
Example 3: Metric example
Maintenance calories: 2,450
Daily deficit: 550
Daily calorie target: 1,900
Planning estimate: about 0.5 kg per week
How to Use the Results
- Start with the estimated maintenance calories instead of guessing a target blindly.
- Pick a pace that still leaves room for regular meals, training, work, and social life.
- Hold that target for 2 to 3 weeks before changing anything unless the plan feels clearly too aggressive.
- Track trend weight, waist, photos, energy, hunger, and training performance together.
- Recalculate after body weight changes, big activity changes, or a clear plateau.
Why the Scale Can Stall
- Water retention after harder training or extra sodium.
- Hormonal shifts and menstrual cycle changes.
- Digestion and meal timing.
- Tracking errors from portions, sauces, drinks, or eating out.
- Activity level overestimation.
- Maintenance calories changing as body weight trends down.
Frequently Asked Questions
These short answers cover the questions that usually come up right after someone checks their daily calorie target.
What is a calorie deficit?
A calorie deficit happens when daily energy intake is lower than daily energy expenditure. When that gap is sustained over time, the body uses stored energy and body weight usually trends down.
How many calories should I eat to lose weight?
A useful starting point is maintenance calories minus a moderate deficit. This page estimates maintenance calories first, then shows a daily calorie target based on the pace selected.
Is a 500 calorie deficit good for weight loss?
For many adults, a 500 calorie deficit is a practical middle ground. It often lines up with roughly 1 pound or about 0.45 kilogram of weight loss per week as a planning estimate, though real results vary.
Why is my weight not dropping even though I am in a deficit?
Short stalls can happen because of water retention, sodium intake, digestion, menstrual cycle changes, stress, sleep, and normal scale noise. Compare weekly averages instead of single weigh-ins, then adjust only after a clear trend appears.
What is the difference between BMR and TDEE?
BMR is the energy used at rest for basic functions. TDEE adds movement, exercise, and day-to-day activity on top of BMR to estimate maintenance calories.
Does this calorie deficit calculator work for lb and kg?
Yes. The calculator supports both US and metric units, converts values instantly, and shows projected weight change in the selected unit system.
Can women and men use the same calculator?
Yes. The page works for women and men and applies the standard Mifflin-St Jeor constants used in calorie calculators for healthy adults.
When should calorie targets be recalculated?
Recheck calorie targets after meaningful body weight changes, activity changes, or when progress stalls for several weeks. Maintenance calories are not fixed forever.
References and Further Reading
Reference links build trust and make it easier to verify the formulas, calorie planning concepts, and safety notes used on this page.
Health and methodology sources
Additional pages reviewed for comparison
- Calcipedia calorie deficit calculator
- DeficitCalc calorie deficit calculator
- CalorieDeficitCalc.org
- NutritionCalcs calorie deficit calculator
- Everyday Calculators calorie deficit calculator
- FitWatch calorie deficit calculator
- HealthCalcz calorie deficit calculator
- CalorieDeficitCalc.xyz
- Healthline calorie deficit guide
- Pearson calorie and deficit calculator
The calculator and guide are intended for general adult planning. Pregnancy, breastfeeding, eating-disorder history, or medical nutrition therapy call for individual guidance from a qualified professional.