Calorie Deficit Calculator
Translate maintenance calories and daily intake into a practical calorie-deficit estimate and weekly loss pace.
How to use this calorie deficit calculator
- Enter current weight
Enter your current body weight in the current weight field.
- Enter target weight
Enter your goal weight in the target weight field.
- Enter maintenance calories
Enter your estimated TDEE or maintenance calories in the maintenance calories field.
- Enter planned intake
Enter the daily calorie intake you plan to eat in the planned daily intake field.
- Review deficit and pace
Check your estimated daily deficit, weekly weight loss, pace guidance, and the suggested intake range.
How this calorie deficit calculator works
This calorie deficit calculator compares your planned intake with maintenance calories, estimates how quickly that gap may move body weight, and adds practical planning guidance around pacing. In addition to the deficit itself, it highlights whether the cut looks gentle, moderate, or aggressive, estimates the midpoint of the journey, and suggests an intake range that many people use for more sustainable fat-loss planning.
Calorie deficit = maintenance calories − daily intake; weekly weight change ≈ (daily deficit × 7) ÷ 7,700 If maintenance calories are 2,400 and planned intake is 1,900, the daily deficit is 500 calories. That corresponds to roughly 0.45 kg per week and gives you a planning timeline with an estimated midpoint and final target date so you can judge whether the pace is realistic for your schedule.
If maintenance calories are 2,200 and planned intake is 1,800, the daily deficit is 400 calories. That corresponds to roughly 0.36 kg per week, which is a moderate pace that most people can sustain without significant fatigue or hunger.
If maintenance calories are 3,000 and planned intake is 2,250, the daily deficit is 750 calories. That corresponds to roughly 0.68 kg per week, an aggressive pace that can work well for people with higher body-fat levels but may need to be eased back if energy and recovery start to suffer.
- ✓ The estimate assumes your maintenance calories are reasonably accurate at the start of the plan.
- ✓ The model uses a simplified 7,700 kcal per kilogram planning rule and does not fully capture metabolic adaptation.
- ✓ Suggested intake ranges are planning heuristics based on moderate deficits rather than clinical prescriptions.
- ✓ Real-world progress varies because of adherence, water retention, training volume, and changes in maintenance calories over time.
- A faster cut is not automatically better. Larger deficits usually produce more fatigue, more hunger, and a higher risk of poor adherence.
- The suggested intake range gives you a quick way to compare your planned calories with a more moderate target instead of guessing from scratch.
- If progress stalls over time, your maintenance calories may have dropped and the deficit may no longer be as large as it was at the start.
What is a calorie deficit?
A calorie deficit exists whenever you consume fewer calories than your body expends over a given period. Your body compensates for the missing energy by breaking down stored fuel — primarily adipose tissue (body fat), though glycogen stores and, in some cases, muscle protein also contribute. The size of the deficit determines the theoretical pace of weight loss: a daily shortfall of about 500 kilocalories, sustained over a week, corresponds to roughly 0.45 kg (1 lb) of expected fat loss using standard planning estimates. In practice, the rate is not perfectly steady because water retention, hormonal fluctuations, and changes in gut contents can mask or exaggerate real fat loss on the scale from day to day. Tracking a trend over weeks rather than reacting to daily weight swings gives a much clearer picture of actual progress.
Sustainable vs aggressive deficits
Choosing how large a calorie deficit to maintain is one of the most impactful decisions in a weight-loss plan. A moderate deficit of 300 to 500 kilocalories per day is often called sustainable because it is large enough to produce meaningful progress — roughly 0.25 to 0.5 kg per week — while still leaving enough calorie headroom for adequate nutrition, training energy, and daily comfort. Aggressive deficits above 750 kilocalories per day can accelerate initial results but come with trade-offs: greater hunger, more fatigue, higher risk of muscle loss, and a sharply increased chance of diet abandonment. Research consistently shows that the diets people stick with are the ones that produce lasting results, regardless of how fast the first few weeks go. If you find yourself constantly tired, losing strength in the gym, or experiencing intense cravings, the deficit may be too large for your current circumstances and pulling it back by 100 to 200 kilocalories per day can make the plan far more liveable.
Calorie deficit calculator FAQs
What is a safe daily calorie deficit?
A deficit of roughly 300 to 750 kcal per day is a commonly cited range. Larger deficits can accelerate results but may be harder to sustain and can affect energy and recovery.
Where do I get my maintenance calories?
Use a TDEE (total daily energy expenditure) calculator that factors in your age, weight, height, and activity level. Enter that number here as maintenance calories.
Why is my estimated timeline longer than expected?
The calculator assumes a steady deficit. In practice, metabolic adaptation, water fluctuations, and changes in activity can slow progress compared to the linear estimate.
What does the pace guidance mean?
It is a simple way to flag whether the planned deficit looks gentle, moderate, aggressive, or very aggressive. The goal is not to prescribe a universal answer, but to help you see when the planned cut may be harder to sustain.