TDEE Calculator US Units 2026
Quick Take
TDEE = BMR × activity factor. This simple formula estimates your total daily calorie burn from resting metabolism multiplied by how active you are. The five standard activity factors range from 1.2 (sedentary) to 1.9 (extremely active). Using imperial units, you calculate BMR with pounds and inches, then apply the multiplier.
Total Daily Energy Expenditure (TDEE) is the single most important number in nutrition — it represents the total calories your body burns each day. Every weight management plan, whether for loss, maintenance, or muscle gain, revolves around balancing caloric intake against TDEE. When you understand your TDEE, you have a baseline for making informed decisions about diet and training.
In the United States, most people think in imperial units — pounds for weight, inches for height. This article walks through the TDEE calculation using familiar US measurements, shows how the activity factor system works, and provides reference ranges for different profiles. For an instant estimate, use the TDEE Calculator on VivMetric, which accepts pounds and inches directly.
The TDEE Formula: Simple but Powerful
TDEE is calculated using a straightforward two-step process:
Step 1: Calculate your BMR (basal metabolic rate) using the Mifflin-St Jeor formula.
Step 2: Multiply BMR by an activity factor that reflects your typical daily movement and exercise.
That is the entire calculation. The simplicity is part of its power — TDEE estimation is accessible to anyone without specialized equipment. The key inputs are age, sex, weight, height, and activity level. No blood work, no metabolic testing, no calorie counting required.
Imperial Mifflin-St Jeor for BMR
Men: BMR = (4.536 × weight_lb) + (15.875 × height_in) − (5 × age) − 161
Women: BMR = (4.536 × weight_lb) + (15.875 × height_in) − (5 × age) − 322
Activity Factor Multipliers
| Activity Level | Factor | Weekly Physical Activity |
|---|---|---|
| Sedentary | 1.20 | No structured exercise |
| Lightly Active | 1.375 | 30–60 min moderate, 3–5 days/week |
| Moderately Active | 1.55 | 60–90 min moderate, 5–7 days/week |
| Very Active | 1.725 | 60–90 min vigorous, 6–7 days/week |
| Extremely Active | 1.90 | 10+ hours intense training weekly |
Worked Example: TDEE with US Units
Let us walk through a complete TDEE calculation for a typical US adult.
Profile: 40-Year-Old Woman, 165 lb, 5'6" (66 inches), Lightly Active
Step 1: Calculate BMR
BMR = (4.536 × 165) + (15.875 × 66) − (5 × 40) − 322
BMR = 748.44 + 1,047.75 − 200 − 322 = 1,274.19 ≈ 1,274 calories
Step 2: Apply Activity Factor
Lightly active factor = 1.375
TDEE = 1,274 × 1.375 = 1,751 ≈ 1,750 calories/day
This value means the woman burns approximately 1,750 calories per day. If she eats 1,750 calories daily, her weight should remain stable. Eating 250 calories fewer per day would create a modest deficit of 1,750 calories per week (about 0.5 pounds of fat loss, since 1 pound of fat ≈ 3,500 calories).
TDEE Reference Ranges by Profile
The following table provides typical TDEE ranges for different adult profiles using imperial units and standard activity factors. These are population-level estimates — individual variation can be ±20% or more.
| Profile | BMR (Mifflin-St Jeor) | TDEE Range by Activity |
|---|---|---|
| Woman, 30, 150 lb, 5'5" | 1,360 | 1,630 – 2,580 |
| Man, 30, 175 lb, 5'9" | 1,710 | 2,050 – 3,250 |
| Woman, 40, 165 lb, 5'6" | 1,275 | 1,530 – 2,420 |
| Man, 40, 190 lb, 5'10" | 1,585 | 1,900 – 3,010 |
| Woman, 50, 155 lb, 5'4" | 1,175 | 1,410 – 2,230 |
| Man, 50, 185 lb, 5'10" | 1,495 | 1,800 – 2,840 |
TDEE ranges are wide — the difference between sedentary and very active for the same person can be 800–1,200 calories per day. This underscores why activity level matters more than many people realize. A 30-year-old man who transitions from sedentary (2,050 calories) to very active (2,960 calories) would need to increase his daily intake by 900 calories to maintain weight — or lose 1 pound every 4 days if he keeps eating the same amount.
Where the Activity Factors Come From
The standard activity factors were developed by the USDA Human Nutrition Information Service in the 1950s and refined in subsequent decades. They represent the ratio of total daily expenditure to BMR and are based on doubly-labeled water studies — the gold-standard method for measuring actual energy expenditure over 1–2 week periods.
Doubly-labeled water is expensive and requires specialized laboratory analysis, so it is not practical for routine use. Instead, the activity factor system provides a validated shortcut. Each factor was derived from population averages, meaning they work well for estimating group needs but may not perfectly match every individual. However, for practical calorie planning, they are the most widely used and validated estimation method available.
Adjusting TDEE for Real-World Accuracy
The calculated TDEE is a starting point, not a final number. Several adjustments can improve accuracy:
Track Body Weight for 2–3 Weeks
The ultimate validation method: weigh yourself daily under consistent conditions (morning, after bathroom, before breakfast) and average the week. If your weight is stable and you know your average daily caloric intake, that intake is your actual TDEE. If you are losing weight, your intake is below TDEE; if gaining, it is above.
Account for Metabolic Adaptations
If you have been in a prolonged calorie deficit (12+ weeks), your metabolism may be 5–15% lower than predicted due to adaptive thermogenesis. Conversely, if you have been consistently overeating, your metabolism may be slightly elevated. These adaptations are modest but can matter for precise calorie targeting.
Adjust for Occupational Activity
Many people have jobs that include significant physical activity — construction workers, nurses, warehouse staff, outdoor maintenance workers. If your job involves 4+ hours of moderate physical activity daily, your TDEE may be better captured by the "Moderately Active" or "Very Active" factor rather than "Sedentary," even if you do not exercise formally.
Using the TDEE Calculator on VivMetric
The TDEE Calculator on VivMetric implements the full calculation with US imperial units. Input your age, sex, weight in pounds, height in inches, and activity level — the calculator instantly provides your BMR, TDEE, and target calorie ranges for weight loss, maintenance, and muscle gain.
For a more granular breakdown, use the BMR Calculator to see your resting metabolism independently, or the Exercise Calorie Calculator to understand how individual workouts contribute to your total daily burn. The Calorie Deficit Calculator then shows how different deficit sizes translate to projected weight change.