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Calorie Deficit Calculator

Estimate a realistic calorie deficit, target calories, and weekly weight-change range, then turn the result into a personalized ZenFit AI weight loss plan.

Estimate your targets

Enter the basics that shape this estimate, then use the interactive calculator after the app loads to adjust the numbers.

Input

maintenance calories

Input

body weight

Input

deficit preference

Input

activity level

1

deficit calories

This output is useful for planning, not for diagnosis or guaranteed results.

2

target calories

This output is useful for planning, not for diagnosis or guaranteed results.

3

estimated weekly change

This output is useful for planning, not for diagnosis or guaranteed results.

Methodology

Uses estimated maintenance calories and conservative percentage-based deficit ranges. It is a planning estimate, not a guarantee or medical prescription.

The estimate should be compared with real-world outcomes over time. Body weight trends, training performance, hunger, schedule, sleep, injury status, and consistency can all change what works in practice.

Important safety note

This tool is for general fitness education and planning context. It is not medical advice. If you are pregnant, managing a medical condition, recovering from an injury, changing medication, or unsure whether a calorie or training change is appropriate, speak with a qualified clinician.

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Frequently asked questions

What is a reasonable calorie deficit?

Many people start with a modest deficit rather than an aggressive one. The right target depends on adherence, body size, training, hunger, and health context.

Does this calculator guarantee weight loss?

No. It gives an estimate. Real outcomes vary with adherence, water weight, sleep, stress, medication, training, and many individual factors.