Calorie Deficit Calculator — Weight Loss Timeline
By ToolZoneX Team
•
August 2026
Losing fat comes down to eating fewer calories than you burn. This calculator finds your maintenance calories, subtracts a deficit based on the pace you choose, and estimates a realistic timeline to your target weight loss.
How to Use Calorie Deficit Calculator
1.
Enter your age, gender, height, and weight2.
Select your activity level3.
Choose a deficit pace — mild to extreme4.
Enter a target weight loss to see the estimated timeline
Key Features
- Based on the Mifflin-St Jeor equation
- Four deficit pace presets from 0.25 to 1 kg/week
- Estimated weeks-to-goal projection
- Caps suggested intake at a safe 1,200 kcal minimum
When to Use This Tool
•
Setting a realistic daily calorie target for fat loss•
Estimating how long a weight-loss goal will take•
Comparing a mild vs. aggressive deficit pace
Frequently Asked Questions
A deficit of 500-750 kcal/day (about 0.5-0.75 kg/week) is a sustainable pace for most people. Larger deficits are harder to maintain and more likely to cause muscle loss.
1 kg of body fat stores roughly 7,700 kilocalories, so a cumulative deficit of that size corresponds to losing about 1 kg — a widely used estimate for timeline planning.
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