Maintenance Calorie Calculator

As discussed on Reddit and other fitness communities, this tool helps you estimate your daily calorie needs to maintain your current weight (TDEE). Find your starting point for weight loss or muscle gain.

What is a Maintenance Calorie Calculator (Reddit-Style)?

A maintenance calorie calculator is a tool designed to estimate your Total Daily Energy Expenditure (TDEE). In simple terms, it calculates the total number of calories your body burns in a 24-hour period, including sleeping, working, eating, and exercising. Knowing this number is the critical first step for any fitness goal. Communities on Reddit, like /r/fitness, /r/loseit, and /r/xxfitness, constantly emphasize the “calories in, calories out” (CICO) model, and a TDEE calculator is the best starting point.

Your maintenance calories are the amount you need to eat to stay the same weight. If you eat more than this number, you’ll gain weight. If you eat less, you’ll lose weight. This calculator uses the well-regarded Mifflin-St Jeor formula, which is considered more accurate than older methods like the Harris-Benedict equation.

The Maintenance Calorie Formula and Explanation

The calculation is a two-step process. First, we determine your Basal Metabolic Rate (BMR), which is the energy your body uses at complete rest. Then, we multiply that by an activity factor to find your TDEE.

Step 1: Basal Metabolic Rate (BMR) Formula

We use the Mifflin-St Jeor equation, which is praised for its accuracy.

• For Men: BMR = 10 * weight (kg) + 6.25 * height (cm) – 5 * age (years) + 5
• For Women: BMR = 10 * weight (kg) + 6.25 * height (cm) – 5 * age (years) – 161

Step 2: Total Daily Energy Expenditure (TDEE) Formula

TDEE = BMR x Activity Multiplier

This second step accounts for all the calories you burn through daily movement and exercise. Learn more about the difference with our BMR vs TDEE guide.

Formula Variables

Variable	Meaning	Unit	Typical Range
Weight	Your body weight	kg or lbs	40 – 150 kg
Height	Your body height	cm or inches	140 – 210 cm
Age	Your age	years	15 – 80
Activity Multiplier	A factor representing your daily activity level	Unitless	1.2 – 1.9

Practical Examples

Example 1: Moderately Active Office Worker

• Inputs: Female, 35 years old, 68 kg (150 lbs), 165 cm (5’5″), moderately active (gym 3-4 times a week).
• BMR Calculation: (10 * 68) + (6.25 * 165) – (5 * 35) – 161 = 680 + 1031.25 – 175 – 161 = 1375 kcal
• TDEE/Maintenance Calculation: 1375 kcal * 1.55 (Moderately Active) = 2131 kcal/day
• Result: To maintain her weight, she should consume around 2131 calories per day. For weight loss, a target of ~1600-1800 calories would be a good start. For a deeper dive into macros, check out a macros calculator.

Example 2: Lightly Active Student

• Inputs: Male, 22 years old, 80 kg (176 lbs), 183 cm (6’0″), lightly active (walks to class, occasional workout).
• BMR Calculation: (10 * 80) + (6.25 * 183) – (5 * 22) + 5 = 800 + 1143.75 – 110 + 5 = 1839 kcal
• TDEE/Maintenance Calculation: 1839 kcal * 1.375 (Lightly Active) = 2528 kcal/day
• Result: His maintenance level is about 2528 calories. To gain muscle, he could aim for 2800-3000 calories per day.

How to Use This Maintenance Calorie Calculator

1. Select Your Units: Start by choosing Metric (kg, cm) or Imperial (lbs, in). The labels will update automatically.
2. Enter Your Stats: Input your sex, age, weight, and height. Be as accurate as possible.
3. Choose Your Activity Level: This is the most subjective part. As often discussed on Reddit, most people overestimate their activity. If you have an office job and workout 3 times a week, you are likely “Lightly Active” or “Moderately Active,” not “Very Active.”
4. Calculate and Interpret: Hit the “Calculate” button. The primary result is your maintenance TDEE. You will also see your BMR and suggested targets for mild weight loss or gain. Use these numbers as a starting point and adjust based on your real-world results over 2-4 weeks. For more on this, our nutrition guide is a great resource.

Key Factors That Affect Maintenance Calories

Your TDEE isn’t static. Several factors can influence it:

• Exercise Activity (EAT): The calories burned during structured exercise like running, lifting weights, or sports. This is a significant factor.
• Non-Exercise Activity Thermogenesis (NEAT): This is a major, often underestimated component. It includes all movement that isn’t formal exercise, like walking, fidgeting, cleaning, or standing. Increasing your NEAT is a powerful way to increase your TDEE.
• Body Composition: Muscle tissue is more metabolically active than fat tissue. A person with more muscle mass will have a higher BMR and TDEE than someone of the same weight with more body fat. This is a key concept in body recomposition.
• Age: Metabolic rate naturally slows down as we age, primarily due to a gradual loss of muscle mass.
• Sex: Men generally have a higher BMR than women due to typically higher muscle mass and lower body fat percentages.
• Thermic Effect of Food (TEF): Your body uses energy to digest, absorb, and metabolize the food you eat. Protein has a higher TEF than carbs or fats. This accounts for about 10% of your TDEE.

Frequently Asked Questions (FAQ)

1. How accurate is this maintenance calorie calculator?

This calculator provides a very good estimate based on a scientifically validated formula. However, it’s a starting point. Your true TDEE can vary. The best method is to use this number, track your weight for 2-3 weeks, and adjust your calorie intake up or down if your weight changes when you don’t want it to.

2. What’s the difference between BMR and TDEE?

BMR (Basal Metabolic Rate) is the calories your body burns at complete rest. TDEE (Total Daily Energy Expenditure) is your BMR plus all calories burned from any activity, including exercise and daily movement. TDEE is your actual maintenance calorie number.

3. I chose “Sedentary,” but I work out. Is that right?

Many Reddit users suggest starting with “Sedentary” if you have a desk job, even if you exercise. Then, you track your exercise calories separately. An alternative, which this calculator uses, is to choose the activity level that represents your average week. If you’re unsure, it’s better to underestimate than overestimate your activity level.

4. Why are my results different from another calculator?

Different calculators may use different formulas (e.g., Mifflin-St Jeor vs. Harris-Benedict vs. Katch-McArdle). The Mifflin-St Jeor equation used here is considered the modern standard for the general population.

5. Should I eat the same number of calories on rest days?

For simplicity, most people eat the same number of calories each day and focus on the weekly average. Some advanced users practice “calorie cycling,” eating more on training days and less on rest days, but this isn’t necessary for most people to see results.

6. How often should I recalculate my maintenance calories?

You should recalculate your TDEE after every 5-10 kg (10-20 lbs) of weight change, or if your weekly activity level changes significantly for a prolonged period (e.g., you start a new, more physical job).

7. Can I use this calculator for weight loss?

Yes. Once you know your maintenance calories, you can create a calorie deficit for weight loss. A deficit of 300-500 calories below your maintenance number is a sustainable starting point for losing about 0.5-1 lb (0.25-0.5 kg) per week. Our weight loss calculator can help you with this.

8. The results seem high/low, what should I do?

Trust the process. Use the calculated number as your target for 2-3 weeks. Track your daily intake and your morning body weight. If your weight is stable, the number is correct for you. If you are losing weight, it’s slightly low. If you are gaining, it’s slightly high. Adjust by 100-200 calories and repeat.

Related Tools and Internal Resources

Explore our other calculators and guides to take control of your fitness journey:

• TDEE Calculator: Our main TDEE tool for a comprehensive look at your energy expenditure.
• BMR Calculator: Find your baseline metabolic rate.
• Weight Loss Calculator: Plan your deficit and timeline for losing weight.
• Macronutrient Calculator: Figure out your protein, carb, and fat needs.
• Comprehensive Nutrition Guide: Learn the fundamentals of a healthy diet.
• Guide to Body Recomposition: Learn how to lose fat and build muscle simultaneously.