Calculate My Calorie Deficit for Weight Loss
Learn how to calculate a calorie deficit from maintenance calories, how large a deficit to start with, and how to adjust based on weight trends.
Searching calculate my calorie deficit means you want to know how many calories to eat for weight loss. A calorie deficit means eating fewer calories than your body burns over time.
Use our Calorie Calculator or TDEE Calculator to estimate your starting point.
Calorie Deficit Formula
Calorie deficit = Maintenance calories - Calories eaten
If your maintenance calories are 2,400 and you eat 2,000:
2,400 - 2,000 = 400 calorie deficit
Step 1: Estimate Maintenance Calories
Maintenance calories are your estimated TDEE. They include resting metabolism, daily movement, exercise, and digestion.
Step 2: Pick a Starting Deficit
A moderate starting deficit is often easier to sustain.
| Goal | Starting Deficit |
|---|---|
| Slow fat loss | 250 calories/day |
| Moderate fat loss | 500 calories/day |
| Aggressive deficit | Usually needs professional guidance |
Larger deficits are not automatically better. They can increase hunger, fatigue, and muscle loss risk.
Step 3: Track the Trend
Scale weight changes daily from water, sodium, digestion, and hormones. Use weekly averages instead of judging one weigh-in.
If weight is not changing after 2 to 4 weeks, adjust by 100 to 200 calories or increase activity slightly.
Common Mistakes
Overestimating exercise calories can erase the deficit.
Ignoring weekends can hide extra calories.
Dropping calories too low can make the plan harder to follow.
The Bottom Line
To calculate your calorie deficit, estimate maintenance calories and subtract your planned intake. Start moderately, track weekly trends, and adjust slowly.
Use our Calorie Calculator for a practical starting estimate.
Medical note: This article is informational only. Ask a qualified healthcare professional before starting a weight-loss plan if you have a medical condition, history of disordered eating, pregnancy, or special nutrition needs.
How to Calculate: Step-by-Step Guide
Estimate maintenance calories
Use your TDEE, which is the estimated number of calories you burn per day.
Choose a deficit
Subtract a moderate amount, often 250 to 500 calories per day to start.
Track and adjust
Monitor average body weight for 2 to 4 weeks and adjust gradually.