The Best TDEE Calculator Reddit Recommends

A simple, no-nonsense tool to estimate your daily calorie needs based on the Mifflin-St Jeor equation.

What is the best TDEE calculator reddit?

Total Daily Energy Expenditure (TDEE) is an estimation of how many calories your body burns in a 24-hour period. This includes all your activities, from sleeping and breathing to eating and exercising. Understanding your TDEE is fundamental for managing your weight, whether your goal is to lose fat, gain muscle, or maintain your current physique. Communities on Reddit, like r/fitness and r/loseit, frequently emphasize TDEE as the most critical starting point for any diet plan because it provides a science-based target for daily calorie intake. The “best” calculator is one that is accurate, easy to use, and transparent about its formula—which is why the Mifflin-St Jeor equation is so highly regarded.

TDEE Formula and Explanation

This calculator uses the Mifflin-St Jeor equation to first find your Basal Metabolic Rate (BMR), which is the energy your body uses at complete rest. Then, it multiplies your BMR by an activity factor to determine your TDEE. This method is considered the most accurate for the majority of people by institutions like the American Council on Exercise.

TDEE Formula: TDEE = BMR × Activity Multiplier

BMR Formula (Mifflin-St Jeor):

• Men: (10 × weight in kg) + (6.25 × height in cm) - (5 × age in years) + 5
• Women: (10 × weight in kg) + (6.25 × height in cm) - (5 × age in years) - 161

Variables in the TDEE Calculation

Variable	Meaning	Unit	Typical Range
Weight	Your body mass	kg or lbs	40 – 150 kg
Height	Your stature	cm or ft/in	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: Office Worker Aiming for Weight Loss

• Inputs: Female, 35 years old, 165 cm, 75 kg, Sedentary activity level.
• BMR Calculation: (10 × 75) + (6.25 × 165) – (5 × 35) – 161 = 750 + 1031.25 – 175 – 161 = 1445 kcal.
• TDEE Calculation: 1445 × 1.2 = 1734 kcal.
• Result: To maintain her weight, she needs about 1734 calories per day. To lose about 0.5 lbs per week, she could aim for around 1484 calories per day. You can learn more about managing calorie deficits in our guide to sustainable weight loss.

Example 2: Active Student Aiming for Muscle Gain

• Inputs: Male, 22 years old, 180 cm, 80 kg, Moderately Active (gym 4x/week).
• BMR Calculation: (10 × 80) + (6.25 × 180) – (5 × 22) + 5 = 800 + 1125 – 110 + 5 = 1820 kcal.
• TDEE Calculation: 1820 × 1.55 = 2821 kcal.
• Result: His maintenance is about 2821 calories. For a slow bulk, he could aim for around 3071 calories per day. To optimize this, he might use our macronutrient calculator.

How to Use This best tdee calculator reddit

1. Select Units: Start by choosing between Metric and Imperial units. The input fields will adjust automatically.
2. Enter Your Details: Fill in your age, gender, weight, and height. Be as accurate as possible.
3. Choose Activity Level: This is the most subjective part. Be honest about your typical week. If in doubt, choose a lower level. Many people overestimate their activity.
4. Interpret the Results: The calculator instantly shows your TDEE (maintenance calories) and BMR. The table below provides targets for weight loss or gain. For more advanced tracking, consider exploring our adaptive TDEE spreadsheet guide.

Key Factors That Affect TDEE

• Basal Metabolic Rate (BMR): The biggest component of your TDEE, accounting for ~60-70% of your daily burn. It’s influenced by age, sex, weight, and height.
• Activity Level (EAT & NEAT): This includes both planned exercise (Exercise Activity Thermogenesis) and non-exercise movement like walking or fidgeting (Non-Exercise Activity Thermogenesis). It’s the most variable factor.
• Thermic Effect of Food (TEF): Your body uses energy to digest food. Protein has the highest TEF, meaning you burn more calories digesting it compared to fats and carbs.
• Age: Metabolic rate naturally slows as you age, primarily due to muscle mass loss.
• Body Composition: Muscle tissue burns more calories at rest than fat tissue. Our body composition calculator can provide more insight.
• Genetics: Some individuals have naturally faster or slower metabolic rates, though this is less of a factor than the others.

Frequently Asked Questions (FAQ)

1. Is this the best TDEE calculator reddit users approve of?

This calculator uses the Mifflin-St Jeor formula, which is widely accepted as accurate and is frequently recommended in fitness subreddits for its reliability.

2. How accurate are TDEE calculators?

They provide a very good estimate and starting point. However, they are not 100% precise. The most accurate method is to use the calculator’s result as a baseline, track your calorie intake and weight for 2-3 weeks, and adjust based on your actual results.

3. Should I eat my TDEE to lose weight?

No. Your TDEE is your maintenance calorie level. To lose weight, you need to eat in a calorie deficit (fewer calories than your TDEE). A common starting point is 300-500 calories below your TDEE per day.

4. Why are there options for metric and imperial units?

To make the calculator accessible to users worldwide. The formulas require metric units, so the calculator automatically converts from imperial (pounds, feet, inches) for the calculation.

5. How often should I recalculate my TDEE?

It’s a good idea to recalculate after every 10-15 lbs (5-7 kg) of weight loss or gain, or if your activity level changes significantly, as this will alter your daily energy needs.

6. What is the difference between BMR and TDEE?

BMR (Basal Metabolic Rate) is the calories your body burns at complete rest. TDEE (Total Daily Energy Expenditure) includes your BMR plus all calories burned from physical activity and digestion.

7. Why doesn’t this calculator use body fat percentage?

This calculator uses the Mifflin-St Jeor equation, which doesn’t require body fat percentage and is proven to be accurate for a wide range of people. Formulas like Katch-McArdle use body fat but require an accurate measurement, which can be difficult to obtain.

8. My fitness watch gives a different number. Which one is right?

Fitness trackers often overestimate calories burned from activity. It’s generally recommended to trust a calculator based on a proven formula like this one as your starting point, and then adjust based on your real-world progress. Using our fitness tracker accuracy guide might help.

Explore more calculators and guides to fine-tune your fitness journey:

• BMR Calculator – Understand your baseline calorie needs.
• Macronutrient Calculator – Break down your calories into protein, carbs, and fats.
• Body Fat Calculator – Estimate your body composition.
• Weight Loss Plateau Guide – Learn what to do when your progress stalls.
• Calorie Cycling Explained – An advanced technique for breaking through plateaus.
• Guide to Reading Nutrition Labels – Become an expert at understanding what’s in your food.