A TDEE Calculator estimates how many calories you burn each day by combining your basal metabolic rate (BMR) with your activity level. Use it to set a realistic calorie target for fat loss, muscle gain, or maintenance.
What TDEE Means (and Why It Matters)
TDEE stands for Total Daily Energy Expenditure. It is the total number of calories you burn in 24 hours, including:
- BMR (calories your body uses at rest)
- Activity (movement and exercise)
- Thermic effect of food (calories used to digest and process meals)
Because TDEE reflects your real daily burn, it’s the starting point for building a calorie plan that matches your goal.
The Core Formula: BMR to TDEE
Most TDEE calculators use the Mifflin-St Jeor equation for BMR, then multiply by an activity factor.
Step 1: Calculate BMR
The Mifflin-St Jeor BMR formula (in metric) is:
| Sex | Formula (BMR) |
|---|---|
| Male | BMR = 10×weight(kg) + 6.25×height(cm) − 5×age(years) + 5 |
| Female | BMR = 10×weight(kg) + 6.25×height(cm) − 5×age(years) − 161 |
Step 2: Multiply by Activity Level
Then:
- TDEE = BMR × activity multiplier
Common activity multipliers include sedentary, lightly active, moderately active, very active, and extra active. Your best value depends on how often you move and train.
How to Choose Your Activity Level
Pick the option that matches your lifestyle most days, not your best day. If you’re between two levels, choose the lower one and adjust after you track results.
- Sedentary: desk job, little exercise
- Lightly active: light workouts or walking most days
- Moderately active: consistent exercise 3–5 days/week
- Very active: hard training most weeks
- Extra active: physical job or intense training frequently
Even small differences in daily movement can change your true TDEE.
Unit Conversions You Should Know
The calculator accepts both metric and imperial inputs. If you prefer one system, use it consistently to avoid mistakes.
- Weight: 1 lb = 0.453592 kg
- Height: 1 in = 2.54 cm
Under the hood, the calculator converts everything to the metric units required by the Mifflin-St Jeor equations.
How to Use Your TDEE for Real Goals
Your TDEE is a baseline. To change body weight, you adjust calories based on the deficit or surplus you can sustain.
Maintenance
Eat close to your TDEE. If your weight trends up or down for 2–3 weeks, adjust by 100–200 calories and re-check.
Fat Loss
To lose fat, create a calorie deficit. A practical range is:
- -10% to -20% from TDEE for steady progress
Large deficits often reduce training quality and increase hunger.
Muscle Gain
To gain muscle, aim for a small surplus:
- +5% to +10% from TDEE
Small surpluses help you add lean mass with less fat gain.
Practical Examples
Example 1: Sedentary office worker cutting calories
Jordan is a 32-year-old male, 180 cm, 82 kg, and mostly sedentary. Using a sedentary activity multiplier, the TDEE Calculator estimates his maintenance calories. If his goal is fat loss, he starts with about 10–15% below that number and tracks body weight weekly.
If weight drops too quickly (more than expected) or training feels weak, he increases calories slightly. If weight doesn’t move after 2–3 weeks, he reduces calories by 100–200.
Example 2: Active lifter maintaining and then bulking
Sophia is a 26-year-old female, 165 cm, 60 kg, and trains 4–5 days/week. She selects the activity level that matches her schedule, then uses her TDEE estimate for maintenance. When she wants muscle gain, she adds a small surplus and monitors changes in weight and strength.
If her scale weight rises faster than expected and her waist grows quickly, she reduces the surplus. If strength stalls, she slightly increases calories.
Limitations: Why Your Actual Burn May Differ
TDEE calculators are estimates. Your true daily burn depends on factors like sleep, stress, non-exercise activity (NEAT), and how consistent your training is.
- NEAT can swing your burn by hundreds of calories
- Water retention can mask fat loss or gain
- Adaptive changes happen when you diet or overeat
Use the calculator to start, then fine-tune with real-world data.
How to Track and Calibrate Your TDEE
To improve accuracy, track for at least 10–14 days. Weigh yourself under consistent conditions (same time of day, similar hydration). Use the weekly average, not daily fluctuations.
- Start at your calculated TDEE for maintenance.
- Track average weight change over 1–2 weeks.
- If weight trends up, reduce calories by 100–200/day.
- If weight trends down too fast, increase calories by 100–200/day.
This approach turns an estimate into a personal number you can trust.
Frequently Asked Questions
What is a good TDEE Calculator result for maintenance?
A good maintenance result is the number where your weekly average body weight stays stable. If your weight rises over 2–3 weeks, your maintenance is lower than the estimate. If it drops, your maintenance is higher. Adjust by 100–200 calories and re-check.
How accurate is the Mifflin-St Jeor equation?
Mifflin-St Jeor is widely used and often lands within a reasonable range, but it cannot account for your exact daily movement, stress, sleep, or food intake pattern. For most people, expect a practical estimate that improves once you calibrate with tracking data.
Should I use sedentary or lightly active?
Choose sedentary if you mostly sit and rarely exercise. Choose lightly active if you walk regularly or do light workouts most weeks. If you’re unsure, pick the lower option first. You can adjust after you track your weight trend for 10–14 days.
How many calories should I eat for fat loss?
Start with about 10–20% below your TDEE for fat loss. For example, if your TDEE is 2,000, begin around 1,600–1,800 calories. Then adjust based on weekly weight change and how you feel during training and daily activities.
How many calories should I eat for muscle gain?
For muscle gain, start with a small surplus of about 5–10% above TDEE. If your TDEE is 2,500, begin around 2,625–2,750. Monitor both strength and body measurements. If fat gain is too fast, reduce the surplus.
Next Steps
Use the TDEE Calculator above to get your starting calories, then calibrate with your real weekly weight trend. Small, consistent adjustments beat drastic changes for long-term results.