ZenFit AI Start the Quiz
Back to home

Free fitness tool

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.

Build my deficit plan Use the free estimate first

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.

Next step

Build the plan behind this result

Use the quiz to connect this tool's estimate to workouts, meals, progress tracking, and AI coach context around your real week.

Build my deficit plan

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.

Useful next estimates

Related tools

Browse all tools

Calorie Calculator

Estimate daily calories, maintenance calories, and goal-aware targets, then turn the result into a personalized ZenFit AI workout and meal plan.

TDEE Calculator

Estimate total daily energy expenditure, BMR, and maintenance calories, then use ZenFit AI to personalize the target around your goal and schedule.

Goal Weight Timeline Calculator

Estimate a realistic goal weight timeline range, weekly pace, and planning direction before creating a personalized ZenFit AI plan.

Walking Calories Calculator

Estimate calories burned from walking duration, pace, and body weight, then connect walking to a realistic ZenFit AI plan.