Calorie Deficit Calculator

Give MiniWebtool’s Calorie Deficit Calculator your current weight, goal weight, activity, and weeks to get BMR, TDEE, and a daily deficit capped at 1,000 kcal.

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Help me understand MiniWebtool's Calorie Deficit Calculator: https://miniwebtool.com/calorie-deficit-calculator/. What can I use it for, what inputs or settings do I need, and how do I use it and understand the output? Walk me through one simple example. Use this page as your source and answer in English.

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78 kg to 70 kg in 12 weeks: eat 1,946 kcal a day, lose 0.67 kg a week

Enter your sex, age, height, weight, goal weight, activity level and timeframe.

Quick Goal Presets

Personal Information

Age

years

Gender

Male Female

Measurements

Units

Metric (kg/cm) US (lbs/in)

Height

Current Weight

Goal Weight

Activity & Timeline

Activity Level

Time Frame

weeks

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About Calorie Deficit Calculator

Welcome to the Calorie Deficit Calculator, your comprehensive tool for planning a healthy and sustainable weight loss journey. This calculator uses scientifically-backed formulas to determine your Total Daily Energy Expenditure (TDEE), Basal Metabolic Rate (BMR), and the optimal calorie deficit to reach your goal weight within your chosen time frame.

At a Glance

Calorie Deficit Calculator works out the daily calorie deficit needed to move from your current weight to a goal weight in a chosen number of weeks. It shows BMR, TDEE, a daily calorie target and BMI.

Calorie Deficit Calculator: features at a glance
Feature	What you get	Good for
Inputs and units	Enter age, gender, height, current weight, goal weight, activity level and weeks, in metric (kg/cm) or US (lbs/inches) units.	Planning a weight goal with a deadline
BMR formula	Uses Mifflin-St Jeor: 10 × kg + 6.25 × cm - 5 × age, then +5 for men or -161 for women.	Seeing the resting calorie estimate behind the plan
Activity levels	TDEE is BMR times a factor: 1.2 sedentary, 1.375 lightly active, 1.55 moderately active, 1.725 very active or 1.9 super active.	Matching the estimate to your weekly exercise
Deficit and intake	Gives the daily deficit, capped at 1,000 kcal, and the daily calorie intake, which is TDEE minus the deficit.	Turning a goal weight into daily numbers
BMI	Shows current and target BMI with the categories Underweight, Normal weight, Overweight and Obesity.	Checking where the goal weight falls on the BMI scale
Projection and charts	A weekly weight projection timeline and interactive charts visualize the weight loss journey.	Tracking progress against the timeline

What is a Calorie Deficit?

A calorie deficit occurs when you consume fewer calories than your body burns. This forces your body to use stored energy (primarily fat) to meet its energy needs, resulting in weight loss. The size of your deficit determines how quickly you lose weight:

500 calorie deficit/day = approximately 0.5 kg (1 lb) weight loss per week
750 calorie deficit/day = approximately 0.75 kg (1.5 lbs) weight loss per week
1000 calorie deficit/day = approximately 1 kg (2 lbs) weight loss per week (maximum recommended)

How This Calculator Works

The calculator uses the Mifflin-St Jeor Equation, considered one of the most accurate methods for estimating BMR:

Mifflin-St Jeor Equation

Men: BMR = 10 × weight(kg) + 6.25 × height(cm) − 5 × age + 5
Women: BMR = 10 × weight(kg) + 6.25 × height(cm) − 5 × age − 161

Your TDEE (Total Daily Energy Expenditure) is then calculated by multiplying BMR by an activity factor:

Calorie Deficit Calculator: How This Calculator Works
Activity Level	Factor	Description
Sedentary	1.2	Little or no exercise, desk job
Lightly Active	1.375	Light exercise 1-3 days/week
Moderately Active	1.55	Moderate exercise 3-5 days/week
Very Active	1.725	Hard exercise 6-7 days/week
Super Active	1.9	Very hard exercise + physical job

How to Use This Calculator

Enter your personal details: Age, gender, height, and current weight
Choose your units: Metric (kg/cm) or US (lbs/inches)
Set your goal weight: This should be lower than your current weight
Select your activity level: Be honest for accurate results
Set your time frame: How many weeks to reach your goal
Calculate: Get your personalized calorie deficit plan

Understanding Your Results

Key Metrics Explained

TDEE (Total Daily Energy Expenditure): The total calories your body burns in a day, including all activities
BMR (Basal Metabolic Rate): Calories your body needs at complete rest to maintain vital functions
Daily Calorie Deficit: How many fewer calories you need to eat daily to reach your goal
Recommended Calorie Intake: Your TDEE minus the deficit - this is how much you should eat daily
BMI (Body Mass Index): A measure of body fat based on height and weight

BMI Categories

Calorie Deficit Calculator: BMI Categories
BMI Range	Category
Below 18.5	Underweight
18.5 - 24.9	Normal weight
25 - 29.9	Overweight
30 and above	Obesity

Safe Weight Loss Guidelines

For sustainable and healthy weight loss, follow these guidelines:

Maximum recommended deficit: 500-750 calories per day
Maximum safe weight loss: 0.5-1 kg (1-2 lbs) per week
Minimum calorie intake: 1200 calories for women, 1500 calories for men (without medical supervision)
Combine with exercise: Add strength training to preserve muscle mass
Stay hydrated: Drink adequate water throughout the day

Frequently Asked Questions

What is a calorie deficit?

A calorie deficit occurs when you consume fewer calories than your body burns. To lose weight, you need to create a calorie deficit either by eating less, exercising more, or a combination of both. A deficit of approximately 500-750 calories per day typically results in 0.5-1 kg (1-2 lbs) of weight loss per week.

What is a safe calorie deficit for weight loss?

A safe calorie deficit is typically 500-750 calories per day, which translates to losing about 0.5-1 kg (1-2 lbs) per week. Extreme deficits exceeding 1000 calories per day can lead to muscle loss, nutrient deficiencies, metabolic slowdown, and are generally not sustainable long-term.

How is TDEE calculated?

Total Daily Energy Expenditure (TDEE) is calculated by multiplying your Basal Metabolic Rate (BMR) by an activity factor. This calculator uses the Mifflin-St Jeor equation for BMR, which is considered one of the most accurate formulas available.

How many calories should I eat to lose weight?

To lose weight, eat fewer calories than your TDEE. A moderate deficit of 500 calories below your TDEE is effective and sustainable. For example, if your TDEE is 2500 calories, eating 2000 calories daily creates a 500-calorie deficit.

Why should I not go below 1200 calories?

Eating below 1200 calories (women) or 1500 calories (men) daily can be dangerous without medical supervision. Very low calorie diets can cause nutrient deficiencies, muscle loss, gallstones, metabolic adaptation, and other health issues.

Additional Resources

Reference this content, page, or tool as:

"Calorie Deficit Calculator" at https://MiniWebtool.com/calorie-deficit-calculator/ from MiniWebtool, https://MiniWebtool.com/

by miniwebtool team. Updated: Jan 30, 2026

Developer API available: Run this tool from your app, automation, or agent with one JSON HTTP request. View API docs

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